The document discusses different types of six-stroke engines, including the Brush Crower engine and Beare Head engine. The Brush Crower engine captures heat from the four-stroke cycle to power an additional two strokes using water injection. The Beare Head engine combines aspects of two-stroke and four-stroke engines by using ports and a rotary valve like a two-stroke in the cylinder head. Six-stroke engines provide benefits like increased efficiency and torque compared to four-stroke engines. However, they also present challenges such as initial starting problems due to low cylinder temperatures.
The document describes Velozeta's six-stroke engine, which was developed by modifying a four-stroke Honda engine. The first four strokes are identical to a conventional four-stroke engine. During the fifth stroke, air is inducted into the cylinder through a secondary line to improve scavenging. In the sixth stroke, the fresh air and remaining gases are expelled through the exhaust. Modifications included changing the camshaft and crankshaft sprockets to achieve six strokes, adding reed valves, and a secondary air induction system. The six strokes provide better cooling and scavenging than a conventional four-stroke engine.
The document provides an overview of a seminar presentation on a six-stroke internal combustion engine. It includes an abstract, introduction, working principles, types of six-stroke engines, modifications made to convert a four-stroke engine to six-stroke, advantages such as reduced emissions and increased efficiency, and limitations. The six-stroke engine aims to extract more energy from the combustion process through adding an additional power stroke, utilizing the wasted heat from the four-stroke cycle. It functions by injecting water during the additional power stroke to generate steam for forcing the piston downward.
1. The document discusses the two-stroke cycle gasoline engine, describing its basic parts and principle of operation. It has several key advantages over the four-stroke engine, including higher power density and simpler design.
2. The basic parts are the piston, cylinder block, crankshaft, connecting rod, flywheel, spark plug, inlet port, exhaust port, and transfer port. Each downward piston stroke is a power stroke, and each upward stroke is a compression stroke.
3. It intakes and exhausts on the same stroke, achieving two cycles per revolution compared to one cycle per two revolutions for a four-stroke. However, its scavenging is less efficient, resulting in lower thermal
The document discusses a six-stroke engine developed by mechanical engineering students at the College of Engineering in Trivandrum, India. The engine was created as a student project and later commercialized as the Velozeta six-stroke engine. It modifies a four-stroke Honda engine to add two additional strokes. During the fifth stroke, air is inducted through a secondary system to scavenge the cylinder. During the sixth stroke, the air and exhaust gases are pushed out. This additional induction and exhaust process improves scavenging and cooling over a conventional four-stroke engine. The students received a patent for their design and went on to form the company Velozeta to commercialize the six-stroke engine technology.
The document describes a 6-stroke engine that aims to increase efficiency and reduce emissions compared to a conventional 4-stroke engine. The 6-stroke engine adds two additional strokes: a secondary power stroke using steam generated from injected water, and a secondary exhaust stroke. This leads to improvements such as up to 45% efficiency, lower fuel consumption and emissions compared to 35% efficiency for a 4-stroke engine. However, challenges include preventing damage from thermal stresses during water injection and addressing weight and space needs of a separate water tank.
The document provides information about the basic parts of an internal combustion engine. It lists and describes the main components including the cylinder head, valves, camshaft, cylinder block, cylinders, piston, connecting rods, crankshaft, main bearings, flywheel, and timing drives. It explains their functions and how they work together in the engine combustion cycle.
The 5-stroke internal combustion engine developed by Ilmor utilizes two firing cylinders that exhaust alternately into a central expansion cylinder, extracting extra work. This allows the engine to run with an expansion ratio of 14.5:1 like a diesel while achieving fuel consumption of only 226 g/kWh. The expansion and compression processes are decoupled, enabling independent optimization. Initial running of the prototype produced impressive fuel efficiency over a wide operating range due to greater work extraction in the low pressure cylinder upon knock onset, providing self-compensation.
The document discusses two-stroke engines that are commonly used to power small machines for farming and landscaping. It describes the basic cycle of a two-stroke engine, including the intake, compression, power, and exhaust strokes. Key aspects like the inlet, transfer, and exhaust ports are explained. The governor device is also summarized, which automatically controls and regulates the engine speed under varying loads.
The document describes Velozeta's six-stroke engine, which was developed by modifying a four-stroke Honda engine. The first four strokes are identical to a conventional four-stroke engine. During the fifth stroke, air is inducted into the cylinder through a secondary line to improve scavenging. In the sixth stroke, the fresh air and remaining gases are expelled through the exhaust. Modifications included changing the camshaft and crankshaft sprockets to achieve six strokes, adding reed valves, and a secondary air induction system. The six strokes provide better cooling and scavenging than a conventional four-stroke engine.
The document provides an overview of a seminar presentation on a six-stroke internal combustion engine. It includes an abstract, introduction, working principles, types of six-stroke engines, modifications made to convert a four-stroke engine to six-stroke, advantages such as reduced emissions and increased efficiency, and limitations. The six-stroke engine aims to extract more energy from the combustion process through adding an additional power stroke, utilizing the wasted heat from the four-stroke cycle. It functions by injecting water during the additional power stroke to generate steam for forcing the piston downward.
1. The document discusses the two-stroke cycle gasoline engine, describing its basic parts and principle of operation. It has several key advantages over the four-stroke engine, including higher power density and simpler design.
2. The basic parts are the piston, cylinder block, crankshaft, connecting rod, flywheel, spark plug, inlet port, exhaust port, and transfer port. Each downward piston stroke is a power stroke, and each upward stroke is a compression stroke.
3. It intakes and exhausts on the same stroke, achieving two cycles per revolution compared to one cycle per two revolutions for a four-stroke. However, its scavenging is less efficient, resulting in lower thermal
The document discusses a six-stroke engine developed by mechanical engineering students at the College of Engineering in Trivandrum, India. The engine was created as a student project and later commercialized as the Velozeta six-stroke engine. It modifies a four-stroke Honda engine to add two additional strokes. During the fifth stroke, air is inducted through a secondary system to scavenge the cylinder. During the sixth stroke, the air and exhaust gases are pushed out. This additional induction and exhaust process improves scavenging and cooling over a conventional four-stroke engine. The students received a patent for their design and went on to form the company Velozeta to commercialize the six-stroke engine technology.
The document describes a 6-stroke engine that aims to increase efficiency and reduce emissions compared to a conventional 4-stroke engine. The 6-stroke engine adds two additional strokes: a secondary power stroke using steam generated from injected water, and a secondary exhaust stroke. This leads to improvements such as up to 45% efficiency, lower fuel consumption and emissions compared to 35% efficiency for a 4-stroke engine. However, challenges include preventing damage from thermal stresses during water injection and addressing weight and space needs of a separate water tank.
The document provides information about the basic parts of an internal combustion engine. It lists and describes the main components including the cylinder head, valves, camshaft, cylinder block, cylinders, piston, connecting rods, crankshaft, main bearings, flywheel, and timing drives. It explains their functions and how they work together in the engine combustion cycle.
The 5-stroke internal combustion engine developed by Ilmor utilizes two firing cylinders that exhaust alternately into a central expansion cylinder, extracting extra work. This allows the engine to run with an expansion ratio of 14.5:1 like a diesel while achieving fuel consumption of only 226 g/kWh. The expansion and compression processes are decoupled, enabling independent optimization. Initial running of the prototype produced impressive fuel efficiency over a wide operating range due to greater work extraction in the low pressure cylinder upon knock onset, providing self-compensation.
The document discusses two-stroke engines that are commonly used to power small machines for farming and landscaping. It describes the basic cycle of a two-stroke engine, including the intake, compression, power, and exhaust strokes. Key aspects like the inlet, transfer, and exhaust ports are explained. The governor device is also summarized, which automatically controls and regulates the engine speed under varying loads.
This document describes two 6-stroke engine designs that aim to improve fuel efficiency over traditional 4-stroke engines. The first is Bruce Crower's 6-stroke engine, which captures wasted heat from the 4-stroke cycle to power an additional steam stroke. The second is the Beare dual opposed piston 6-stroke engine, which replaces the cylinder head with an overhead piston arrangement, combining a 4-stroke bottom end with a 2-stroke head cycle. Both designs are analyzed against traditional 4-stroke engines and are found to increase power and torque output while improving fuel economy.
Six stroke-engine-presenation-by vijay b r Adskaro
The majority of the actual internal combustion engines, operating on different cycles have one common feature, combustion occurring in the cylinder after each compression, resulting in gas expansion that acts directly on the piston (work) and limited to 180 degrees of crankshaft angle.
According to its mechanical design, the six-stroke engine with external and internal combustion and double flow is similar to the actual internal reciprocating combustion engine. Six-stroke engine differentiates itself due to its thermodynamics cycle and a modified cylinder having one combustion chamber and one air heating chamber, both independent from cylinder. Combustion does not occur within the cylinder but in the supplementary combustion chamber, does not act immediately on the piston, and its duration is independent from the 180 degrees of crankshaft rotation that occurs during the expansion of the combustion gases (work).
The combustion chamber is kept inside the air heating chamber. Air pressure in the heating chamber increases and generate power for a supplementary work stroke by virtue of heat exchange through glowing combustion chamber walls. Several advantages result from this, one very important being the increase in thermal efficiency. In the present time internal combustion engine, important calorific losses are generated due to the required cooling of the combustion chamber walls.
In six-stroke cycle, two parallel functions occur in two chambers which result in eight event cycle: four event internal combustion cycle and four event external combustion cycles.
The first cycle of four events is of external combustion. It includes Event 1: pure air intake in the cylinder. Event 2: pure air compression in the heating chamber. Event 3: keeping pure air pressure in closed chamber where a maximum heat exchange occurs with the combustion chambers walls, without direct action on the crankshaft. Event 4: expansion of the super heated air in the cylinder, work. During this four event's cycle, the pure air never comes in direct contact with the heating source. The second cycle of four events is of internal combustion. It includes Event 5: re-compressions of pure heated air in the combustion chamber. Events 6: fuel injection and combustion in closed combustion chamber, without direct action on the crankshaft.
Events 7: combustion gases expanding in the cylinder, work. Event 8: combustion gases exhaust.
During these four events, the air comes in direct contact with the heating source.
Training report on Diesel Engine's component Engine headAbhishek Jakhar
This document provides an overview of diesel engine components and terminology. It discusses the purpose, working principle, classification, and history of diesel engines. The key components described include the engine block, crankshaft, pistons, connecting rods, cylinder liners, cylinder head, camshaft, valves, fuel system, and air system. Terminology explained includes top dead center, bottom dead center, compression ratio, indicated power, brake power, and efficiency. Piping systems of ships are also mentioned as a related topic.
The document discusses the concept of a six-stroke engine as a way to improve efficiency over traditional four-stroke engines. It provides examples of different six-stroke engine designs, including those that use a single piston or opposed pistons. The Crower and Bajulaz six-stroke engines are described in more detail. Testing showed the six-stroke engine could run smoothly. Advantages of six-stroke engines include reduced fuel consumption, pollution, friction, and increased torque and efficiency compared to four-stroke engines. They do not require major modifications to existing engine designs.
The document defines key terms related to internal combustion engines, including:
- Types of engine efficiency (volumetric, combustion, thermal)
- Indicated and brake horsepower
- Positions of the piston in the cylinder (top dead center, bottom dead center)
- Stroke and bore dimensions
- Definitions of indirect injection, direct injection, displacement volume, clearance volume, ignition delay, and compression ratio.
- Classifications of engines by stroke cycle (2-stroke, 4-stroke), ignition type (spark, compression), design, cylinder positioning, valve location, fuel, and air/fuel systems.
Diesel engines are commonly used in vehicles like cars, buses, trucks as well as agricultural equipment and generators because they can operate in places with unreliable electricity. Diesel engines ignite fuel using the heat of compressed air rather than a spark plug, and are often more efficient than gasoline engines, though they produce more air pollution. The document discusses the components and operation of both 4-stroke and 2-stroke diesel engines.
Diesel engines differ from petrol/gasoline engines in that diesel engines ignite fuel via compression rather than with a spark plug. Diesel engines have higher compression ratios than petrol engines, ranging from 14:1 to 25:1. This makes diesel engines more efficient but also more expensive than petrol engines. While diesel engines have advantages like better fuel efficiency and reliability, they also have disadvantages like being noisier, producing more emissions, and being harder to start in cold weather. Both engine types are commonly used in vehicles, though diesel sees more use in larger transport like trucks and buses.
The document is a seminar presentation on the ball piston engine. It includes sections on the introduction, mode of operation, design features, material selection, working, lubrication, advantages, disadvantages, applications, and conclusion of the ball piston engine. The ball piston engine uses two intertwined rotors instead of reciprocating pistons, where spherical pistons rotate in a spherical housing with slightly inclined rotational axes to create "strokes" and volume changes in the working chambers. It has potential for higher efficiency than piston engines due to lower friction and more power extraction on the power stroke.
The document discusses two-stroke and four-stroke internal combustion engines. It provides details on the working principles of two-stroke petrol and diesel engines. A two-stroke engine completes the processes of intake, compression, combustion and exhaust in two strokes of the piston rather than four strokes as in a four-stroke engine. This allows a two-stroke engine to produce power during every revolution of the crankshaft.
This document discusses six-stroke engines as a more efficient alternative to four-stroke engines. It describes two main types of six-stroke engine designs: single piston and opposed piston. Several single piston engine examples are provided, including the Griffin engine which uses a heated vaporizer to improve fuel efficiency. The Bajulaz engine is also described, which uses two additional chambers above each cylinder for combustion and air preheating. Benefits over four-stroke engines include increased power and torque, lower emissions, and simpler design. However, six-stroke engines also have increased complexity and cost compared to four-stroke engines. The document suggests they may be best suited for applications like racing vehicles, heavy machinery, and stationary engines.
This document is a report on a six-stroke engine by student Madhvendra Verma. It defines a six-stroke engine as having two additional strokes compared to a four-stroke engine, making it more efficient and reducing emissions. It describes the main types of six-stroke engines, their basic components and workings, and compares six-stroke engines to four-stroke engines, noting advantages like higher thermal efficiency and lower fuel consumption, but also disadvantages like increased complexity and weight.
This document discusses 6-stroke engines and compares them to conventional 4-stroke engines. It outlines different types of 6-stroke engine designs, including single piston and opposed piston configurations. It then compares the key aspects of 4-stroke and 6-stroke engines such as efficiency, emissions, power output, and number of working fluids. The document also lists the modifications required to convert a standard 4-stroke engine to a 6-stroke design. Finally, it outlines the main advantages of 6-stroke engines, including reduced fuel consumption and pollution, less friction, higher efficiency, and more power from the additional power stroke.
The document provides an overview of internal combustion engines. It discusses the basic classifications and cycles of internal combustion engines including two-stroke and four-stroke engines. It also covers the workings of spark ignition and compression ignition engines, as well as common engine components and systems such as carburetors and fuel injection systems. Key topics include the Otto, Diesel, and Carnot power cycles; combustion stages; valve timing diagrams; and scavenging, pre-ignition, detonation, lubrication, and emissions control.
This document summarizes the key components of an internal combustion engine, including: the cylinder head, engine block, oil pan/sump, pistons, connecting rods, crankshaft, camshaft, valves, manifolds, and other parts. It provides brief descriptions of each component and their purpose within the engine.
The report included most of the vital information regarding the Marine diesel engine: the 2 stroke and the 4 stroke, etc that may be helpful to the students.
The document discusses different types of engines including internal and external combustion engines. It describes the basic functions and components of internal combustion engines, which convert chemical energy from fuel into heat and then mechanical energy. The document outlines the four main events required for internal combustion engine operation: air-fuel mixture intake, compression, ignition, and exhaust. It also summarizes the operating cycles of two-stroke and four-stroke engines.
1) The document discusses the assembly, disassembly and maintenance of internal combustion (IC) engines. It covers the main components of IC engines like the cylinder block, cylinder head, piston, connecting rod, crankshaft and camshaft.
2) IC engines are classified based on their cycle of operation, thermodynamic cycle, type of fuel used, ignition method, cooling system and valve location. The working of four-stroke petrol engines, four-stroke diesel engines, and two-stroke petrol and diesel engines are explained.
3) The key components, working cycles and strokes of different engine types are described in detail.
A six-stroke engine works by adding two additional strokes - a water injection stroke and power stroke - to the traditional four-stroke cycle. This allows the engine to extract more energy from the high temperatures in the cylinder after combustion. The water injection stroke cools the cylinder while powering the additional power stroke, improving efficiency by around 40% over a four-stroke engine. The document outlines the working principle, modifications needed to the engine design like camshaft and water injector, advantages like reduced emissions and fuel consumption, and limitations such as cold starting issues.
The six-stroke engine adds two additional strokes to the conventional four-stroke engine cycle. In the additional strokes, water is injected into the superheated cylinder after combustion, where it vaporizes and expands to drive the piston for a secondary power stroke. This captures additional energy from the wasted heat in the cylinder. Simulations show the six-stroke engine has 50% lower fuel consumption, 40-50% higher thermal efficiency, and lower emissions than a four-stroke engine. However, challenges include initial starting issues due to low cylinder temperatures and reliance on a neutral water supply.
This document describes two 6-stroke engine designs that aim to improve fuel efficiency over traditional 4-stroke engines. The first is Bruce Crower's 6-stroke engine, which captures wasted heat from the 4-stroke cycle to power an additional steam stroke. The second is the Beare dual opposed piston 6-stroke engine, which replaces the cylinder head with an overhead piston arrangement, combining a 4-stroke bottom end with a 2-stroke head cycle. Both designs are analyzed against traditional 4-stroke engines and are found to increase power and torque output while improving fuel economy.
Six stroke-engine-presenation-by vijay b r Adskaro
The majority of the actual internal combustion engines, operating on different cycles have one common feature, combustion occurring in the cylinder after each compression, resulting in gas expansion that acts directly on the piston (work) and limited to 180 degrees of crankshaft angle.
According to its mechanical design, the six-stroke engine with external and internal combustion and double flow is similar to the actual internal reciprocating combustion engine. Six-stroke engine differentiates itself due to its thermodynamics cycle and a modified cylinder having one combustion chamber and one air heating chamber, both independent from cylinder. Combustion does not occur within the cylinder but in the supplementary combustion chamber, does not act immediately on the piston, and its duration is independent from the 180 degrees of crankshaft rotation that occurs during the expansion of the combustion gases (work).
The combustion chamber is kept inside the air heating chamber. Air pressure in the heating chamber increases and generate power for a supplementary work stroke by virtue of heat exchange through glowing combustion chamber walls. Several advantages result from this, one very important being the increase in thermal efficiency. In the present time internal combustion engine, important calorific losses are generated due to the required cooling of the combustion chamber walls.
In six-stroke cycle, two parallel functions occur in two chambers which result in eight event cycle: four event internal combustion cycle and four event external combustion cycles.
The first cycle of four events is of external combustion. It includes Event 1: pure air intake in the cylinder. Event 2: pure air compression in the heating chamber. Event 3: keeping pure air pressure in closed chamber where a maximum heat exchange occurs with the combustion chambers walls, without direct action on the crankshaft. Event 4: expansion of the super heated air in the cylinder, work. During this four event's cycle, the pure air never comes in direct contact with the heating source. The second cycle of four events is of internal combustion. It includes Event 5: re-compressions of pure heated air in the combustion chamber. Events 6: fuel injection and combustion in closed combustion chamber, without direct action on the crankshaft.
Events 7: combustion gases expanding in the cylinder, work. Event 8: combustion gases exhaust.
During these four events, the air comes in direct contact with the heating source.
Training report on Diesel Engine's component Engine headAbhishek Jakhar
This document provides an overview of diesel engine components and terminology. It discusses the purpose, working principle, classification, and history of diesel engines. The key components described include the engine block, crankshaft, pistons, connecting rods, cylinder liners, cylinder head, camshaft, valves, fuel system, and air system. Terminology explained includes top dead center, bottom dead center, compression ratio, indicated power, brake power, and efficiency. Piping systems of ships are also mentioned as a related topic.
The document discusses the concept of a six-stroke engine as a way to improve efficiency over traditional four-stroke engines. It provides examples of different six-stroke engine designs, including those that use a single piston or opposed pistons. The Crower and Bajulaz six-stroke engines are described in more detail. Testing showed the six-stroke engine could run smoothly. Advantages of six-stroke engines include reduced fuel consumption, pollution, friction, and increased torque and efficiency compared to four-stroke engines. They do not require major modifications to existing engine designs.
The document defines key terms related to internal combustion engines, including:
- Types of engine efficiency (volumetric, combustion, thermal)
- Indicated and brake horsepower
- Positions of the piston in the cylinder (top dead center, bottom dead center)
- Stroke and bore dimensions
- Definitions of indirect injection, direct injection, displacement volume, clearance volume, ignition delay, and compression ratio.
- Classifications of engines by stroke cycle (2-stroke, 4-stroke), ignition type (spark, compression), design, cylinder positioning, valve location, fuel, and air/fuel systems.
Diesel engines are commonly used in vehicles like cars, buses, trucks as well as agricultural equipment and generators because they can operate in places with unreliable electricity. Diesel engines ignite fuel using the heat of compressed air rather than a spark plug, and are often more efficient than gasoline engines, though they produce more air pollution. The document discusses the components and operation of both 4-stroke and 2-stroke diesel engines.
Diesel engines differ from petrol/gasoline engines in that diesel engines ignite fuel via compression rather than with a spark plug. Diesel engines have higher compression ratios than petrol engines, ranging from 14:1 to 25:1. This makes diesel engines more efficient but also more expensive than petrol engines. While diesel engines have advantages like better fuel efficiency and reliability, they also have disadvantages like being noisier, producing more emissions, and being harder to start in cold weather. Both engine types are commonly used in vehicles, though diesel sees more use in larger transport like trucks and buses.
The document is a seminar presentation on the ball piston engine. It includes sections on the introduction, mode of operation, design features, material selection, working, lubrication, advantages, disadvantages, applications, and conclusion of the ball piston engine. The ball piston engine uses two intertwined rotors instead of reciprocating pistons, where spherical pistons rotate in a spherical housing with slightly inclined rotational axes to create "strokes" and volume changes in the working chambers. It has potential for higher efficiency than piston engines due to lower friction and more power extraction on the power stroke.
The document discusses two-stroke and four-stroke internal combustion engines. It provides details on the working principles of two-stroke petrol and diesel engines. A two-stroke engine completes the processes of intake, compression, combustion and exhaust in two strokes of the piston rather than four strokes as in a four-stroke engine. This allows a two-stroke engine to produce power during every revolution of the crankshaft.
This document discusses six-stroke engines as a more efficient alternative to four-stroke engines. It describes two main types of six-stroke engine designs: single piston and opposed piston. Several single piston engine examples are provided, including the Griffin engine which uses a heated vaporizer to improve fuel efficiency. The Bajulaz engine is also described, which uses two additional chambers above each cylinder for combustion and air preheating. Benefits over four-stroke engines include increased power and torque, lower emissions, and simpler design. However, six-stroke engines also have increased complexity and cost compared to four-stroke engines. The document suggests they may be best suited for applications like racing vehicles, heavy machinery, and stationary engines.
This document is a report on a six-stroke engine by student Madhvendra Verma. It defines a six-stroke engine as having two additional strokes compared to a four-stroke engine, making it more efficient and reducing emissions. It describes the main types of six-stroke engines, their basic components and workings, and compares six-stroke engines to four-stroke engines, noting advantages like higher thermal efficiency and lower fuel consumption, but also disadvantages like increased complexity and weight.
This document discusses 6-stroke engines and compares them to conventional 4-stroke engines. It outlines different types of 6-stroke engine designs, including single piston and opposed piston configurations. It then compares the key aspects of 4-stroke and 6-stroke engines such as efficiency, emissions, power output, and number of working fluids. The document also lists the modifications required to convert a standard 4-stroke engine to a 6-stroke design. Finally, it outlines the main advantages of 6-stroke engines, including reduced fuel consumption and pollution, less friction, higher efficiency, and more power from the additional power stroke.
The document provides an overview of internal combustion engines. It discusses the basic classifications and cycles of internal combustion engines including two-stroke and four-stroke engines. It also covers the workings of spark ignition and compression ignition engines, as well as common engine components and systems such as carburetors and fuel injection systems. Key topics include the Otto, Diesel, and Carnot power cycles; combustion stages; valve timing diagrams; and scavenging, pre-ignition, detonation, lubrication, and emissions control.
This document summarizes the key components of an internal combustion engine, including: the cylinder head, engine block, oil pan/sump, pistons, connecting rods, crankshaft, camshaft, valves, manifolds, and other parts. It provides brief descriptions of each component and their purpose within the engine.
The report included most of the vital information regarding the Marine diesel engine: the 2 stroke and the 4 stroke, etc that may be helpful to the students.
The document discusses different types of engines including internal and external combustion engines. It describes the basic functions and components of internal combustion engines, which convert chemical energy from fuel into heat and then mechanical energy. The document outlines the four main events required for internal combustion engine operation: air-fuel mixture intake, compression, ignition, and exhaust. It also summarizes the operating cycles of two-stroke and four-stroke engines.
1) The document discusses the assembly, disassembly and maintenance of internal combustion (IC) engines. It covers the main components of IC engines like the cylinder block, cylinder head, piston, connecting rod, crankshaft and camshaft.
2) IC engines are classified based on their cycle of operation, thermodynamic cycle, type of fuel used, ignition method, cooling system and valve location. The working of four-stroke petrol engines, four-stroke diesel engines, and two-stroke petrol and diesel engines are explained.
3) The key components, working cycles and strokes of different engine types are described in detail.
A six-stroke engine works by adding two additional strokes - a water injection stroke and power stroke - to the traditional four-stroke cycle. This allows the engine to extract more energy from the high temperatures in the cylinder after combustion. The water injection stroke cools the cylinder while powering the additional power stroke, improving efficiency by around 40% over a four-stroke engine. The document outlines the working principle, modifications needed to the engine design like camshaft and water injector, advantages like reduced emissions and fuel consumption, and limitations such as cold starting issues.
The six-stroke engine adds two additional strokes to the conventional four-stroke engine cycle. In the additional strokes, water is injected into the superheated cylinder after combustion, where it vaporizes and expands to drive the piston for a secondary power stroke. This captures additional energy from the wasted heat in the cylinder. Simulations show the six-stroke engine has 50% lower fuel consumption, 40-50% higher thermal efficiency, and lower emissions than a four-stroke engine. However, challenges include initial starting issues due to low cylinder temperatures and reliance on a neutral water supply.
This document provides an overview of six-stroke engine designs that aim to improve efficiency over traditional four-stroke engines. It describes the working principles of various six-stroke engine types, including single piston designs by Griffin, Bajulaz, Crower, and Velozeta as well as opposed piston designs like the Beare head engine. The document also discusses the modifications needed to convert a conventional engine to a six-stroke design and analyzes the advantages of six-stroke engines like reduced fuel consumption and emissions.
The document describes a six-stroke engine, which has two power strokes compared to the one power stroke of a conventional four-stroke engine. It works by using steam or air as a working fluid during an additional power stroke to extract more power from the engine and increase its efficiency by around 40% compared to a four-stroke Otto cycle engine. The document discusses the working principle, modifications made to the engine like the cam shaft design and water injector, analysis of metrics like pressure/volume diagram, fuel flow rate and thermal efficiency, as well as advantages and limitations of the six-stroke engine.
The document describes a six-stroke engine, which has two additional strokes compared to a four-stroke engine. The additional strokes allow for water injection after the exhaust stroke, which vaporizes and drives the piston for another power stroke. This provides increased efficiency of 40% over a four-stroke engine due to capturing wasted heat. The document outlines the working principle, modifications needed to the engine like materials and cam shaft design, advantages like reduced emissions and fuel consumption, and limitations such as starting problems.
Bhagawan Upreti presented on the six stroke engine. The six stroke engine adds two additional strokes to the traditional four stroke engine cycle to improve efficiency and reduce emissions. It captures waste heat from the four stroke cycle to power an additional exhaust and power stroke. This increases efficiency by 40% over a four stroke engine. Modifications are made to the crankshaft, camshaft, valves and timing to accommodate the extra strokes. While advantages include reduced fuel consumption and emissions, challenges include withstanding thermal stresses and needing separate water tanks for injection. Further development is ongoing to address issues and commercialize six stroke engine technology.
The six-stroke engine was developed to improve fuel efficiency and reduce emissions compared to conventional four-stroke engines. It operates with two additional strokes: in one, water is injected into the hot cylinder and turns to steam, forcing the piston down. In the other, the steam is exhausted up. This captures wasted heat to improve efficiency. Issues include potential engine damage from thermal expansion and needing separate water tanks. However, benefits are 40-60% reduced fuel use and lower emissions than four-stroke engines.
The six-stroke engine was developed to improve fuel efficiency and reduce emissions compared to conventional four-stroke engines. It operates with two additional strokes: in one, water is injected into the hot cylinder and turns to steam, forcing the piston down. In the other, the steam is exhausted up. This captures wasted heat to improve efficiency. Issues include potential engine damage from thermal expansion and needing separate water tanks. However, benefits are 40-60% reduced fuel use and lower emissions than four-stroke engines.
This document describes the working principles and design of a six-stroke engine that uses water injection to improve efficiency. The six-stroke engine adds two additional strokes to the conventional four-stroke cycle to capture heat from the combustion process. In the secondary power stroke, water is injected into the superheated cylinder where it vaporizes, expanding and producing additional power. Thermodynamic analysis shows the six-stroke engine has higher thermal efficiency and lower fuel consumption compared to a four-stroke. However, modifications are needed to the engine components, camshaft, and valves to accommodate the additional strokes. While more efficient, the six-stroke engine also faces drawbacks such as difficulty starting when cold and requiring a source of neutral water.
The document discusses the six stroke engine, which differs from a four stroke engine by having two power strokes - one from fuel and one from steam or air. It provides examples of six stroke engine designs and discusses the working strokes. The six stroke engine has higher efficiency than a four stroke engine but also has higher costs due to its more complex design with additional components. While promising for reducing fuel consumption and emissions, commercializing the six stroke engine faces challenges of high initial costs.
The document discusses a six stroke engine, which has two power strokes compared to the one power stroke of a conventional four stroke engine. It works by using the heat from the four stroke cycle to power an additional expansion and exhaust stroke. This extracts more energy and improves efficiency over a four stroke engine. The six stroke engine requires modifications like a divided fuel/water tank, thermal resistant materials, a modified camshaft, and a water injector system. Analysis shows lower fuel usage, reduced emissions, and up to 50% higher thermal efficiency compared to a four stroke engine, but it also has limitations like cold starting issues and higher manufacturing costs.
This document summarizes a seminar presentation on a six-stroke engine. It begins with introducing common engine types like two-stroke and four-stroke engines. It then explains the concept and working of a six-stroke engine, which adds two additional strokes - a secondary power stroke using water injection and a secondary exhaust stroke. The document discusses the advantages of higher efficiency and lower emissions but also challenges like starting issues. It proposes modifications to the engine components, camshaft design, and water injection system to address these challenges.
An internal combustion engine uses combustion of fuel to drive pistons that convert the energy to mechanical energy. The first modern internal combustion engine was created by Nikolaus Otto in 1876. There are different types of internal combustion engines classified by fuel, strokes, ignition, cycle, number of cylinders, and cooling method. The key parts include the cylinder, piston, connecting rod, valves, crankshaft, and flywheel. A four-stroke engine intakes air/fuel, compresses it, combusts it to push the piston, and exhausts gases over two revolutions, while a two-stroke engine does this in one revolution.
An internal combustion engine uses combustion of fuel to drive pistons that convert the energy to mechanical energy. The first modern internal combustion engine was created by Nikolaus Otto in 1876. There are several types of internal combustion engines including four-stroke gasoline engines, two-stroke gasoline engines, diesel engines, and rotary engines. Engines can also be classified based on their fuel, number of strokes, ignition method, combustion cycle, number of cylinders, and cylinder arrangement. The key parts of an internal combustion engine include the cylinder, piston, connecting rod, valves, crankshaft, and flywheel.
This document provides information about 2-stroke and 4-stroke engines. It defines a 2-stroke engine as completing its cycle in one crankshaft revolution, while a 4-stroke engine takes two revolutions. The basic parts of each engine are described, along with their working principles. Advantages of 2-stroke engines include higher power density, while disadvantages include lower fuel efficiency. A comparison notes that 4-stroke engines have higher volumetric efficiency but lower power density than 2-stroke engines.
Detailed description of Six Stroke Engine with its advantages and disadvantages. It shows the various modifications required to develop a six stroke engine and its feasibility too.
difination and explaintion of 2 strike vs 4stroke enginees including defination, ragulation types of and examples explation for educations and projects
The document discusses different types of six-stroke engines. There are two main approaches - one uses two additional strokes by the main piston, while the other uses a second opposed piston moving at half the speed. Several specific six-stroke engine designs are described, including how they add extra intake or power strokes. The six-stroke engine is said to provide benefits like reduced fuel consumption and emissions compared to a four-stroke engine. However, it also has some disadvantages such as increased size, weight, and cost compared to a traditional design.
The document discusses six-stroke engines as a more efficient alternative to four-stroke engines. There are two main approaches - using a second piston or adding two additional strokes. Six-stroke engines can reduce fuel consumption by 40% and emissions by 65% while maintaining power. They work by adding intake and exhaust strokes to the traditional four-stroke cycle. However, six-stroke engines also have increased size, weight and cost compared to four-stroke designs. Overall, the document evaluates six-stroke engine technology as a way to significantly reduce fuel usage and pollution from internal combustion engines.
The document discusses the history and workings of different types of engines. It describes how Nicolaus Otto invented the four-stroke engine in 1876. A four-stroke engine completes one cycle over four strokes and two revolutions of the crankshaft. It also describes how a two-stroke engine, invented in 1878 by Clerk, completes a cycle in one revolution due to the use of ports instead of valves.
Null Bangalore | Pentesters Approach to AWS IAMDivyanshu
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
Applications of artificial Intelligence in Mechanical Engineering.pdfAtif Razi
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
Design and optimization of ion propulsion dronebjmsejournal
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
Discover the latest insights on Data Driven Maintenance with our comprehensive webinar presentation. Learn about traditional maintenance challenges, the right approach to utilizing data, and the benefits of adopting a Data Driven Maintenance strategy. Explore real-world examples, industry best practices, and innovative solutions like FMECA and the D3M model. This presentation, led by expert Jules Oudmans, is essential for asset owners looking to optimize their maintenance processes and leverage digital technologies for improved efficiency and performance. Download now to stay ahead in the evolving maintenance landscape.
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
Prediction of Electrical Energy Efficiency Using Information on Consumer's Ac...PriyankaKilaniya
Energy efficiency has been important since the latter part of the last century. The main object of this survey is to determine the energy efficiency knowledge among consumers. Two separate districts in Bangladesh are selected to conduct the survey on households and showrooms about the energy and seller also. The survey uses the data to find some regression equations from which it is easy to predict energy efficiency knowledge. The data is analyzed and calculated based on five important criteria. The initial target was to find some factors that help predict a person's energy efficiency knowledge. From the survey, it is found that the energy efficiency awareness among the people of our country is very low. Relationships between household energy use behaviors are estimated using a unique dataset of about 40 households and 20 showrooms in Bangladesh's Chapainawabganj and Bagerhat districts. Knowledge of energy consumption and energy efficiency technology options is found to be associated with household use of energy conservation practices. Household characteristics also influence household energy use behavior. Younger household cohorts are more likely to adopt energy-efficient technologies and energy conservation practices and place primary importance on energy saving for environmental reasons. Education also influences attitudes toward energy conservation in Bangladesh. Low-education households indicate they primarily save electricity for the environment while high-education households indicate they are motivated by environmental concerns.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024Sinan KOZAK
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
2. INTRODUCTION
The SIX-STROKE Engine is a type of internal combustion
engine based on the four-stroke engine, but with additional
complexity intended to make it more efficient and reduce
emissions.
A six stroke engine has two power strokes as compared to
one power stroke of the conventional four stroke engine.
The concept of six stroke engine was developed in mid 20th
century when pollution due to the conventional IC engine
increased.
3. BRUSH CROWER TYPE
SIX STROKE ENGINE
The six stroke engine “Using water” was developed By Brush
Crower in 2006 and he patented his product at the end of 2007.
The engine captures heat, which is lost from conventional four
stroke cycle and additional strokes use it to produce power by
introducing water inside the super heated cylinder.
The working principles of six stroke engine is based on the
concept of four stroke engine but with some modification,
another two strokes are added.
4. WORKING
• SUCTION STROKE
The piston moves from top dead center to
the Bottom dead center and creates
vacuum pressure So the Air and fuel
mixture is sucked in to the Cylinder.
5. COMPRESSION STROKE:
The piston moves from Bottom dead center
to top dead center and compresses the
Mixture. The mixture is compressed To
high temperature and pressure.
POWER STROKE:
At the end of compression stroke the fuel is
ignited and burnt. The pressure inside the
cylinder increases rapidly and it pusses the
piston down and the power is transmitted from
piston to wheel.
6. EXHAUST STROKE:
The Burnt product is pushed through the
exhaust valve by the upward movement of
the piston.
SECONDARY POWER STROKE:
At the end of the exhaust stroke the cylinder
Temperature becomes around 900-1000 C. At
this stage water is injected by an Injector in
the form of fine droplets. The water turns into
Vapour increasing volume around 1600 times
when it comes in contact with the superheated
cylinder.
7. The water turns into vapour increasing volume around 1600
times when it comes in contact with the superheated cylinder.
SECONDARY EXHAUST STROKE:
In this stroke the water vapour
is exhausted by the upward motion
of the piston.
8.
9. Valve timing diagram of 6-stroke engine
IVO: Inlet Valve open
EVO: Exhaust Valve Open
IVC: Inlet Valve Close
EVC: Exhaust Valve Close
WC : Water Injection
11. • Water injection 2ND power stroke:
In order to determine the engine parameters, in 2011 HONDA
motors conducted the first simulation of the six stroke engine by using a
modified Honda GC190 engine.
14. ▪Work obtained by six stroke is the sum of the both combustion
work and vaporization work. So that the break mean effective
pressure will increase.
2. Fuel Flow Rate:
▪Amount of fuel supplied to the engine per unit time is the fuel
flow rate.
▪As the diagram shows the fuel flow rate of 6-stroke engine is
50% lesser than the conventional 4-stroke engine.
15.
16. 3.Thermal Efficiency:
▪ The thermal efficiency of the engine is the power produced by
the engine to the power available from fuel.
▪ The thermal efficiency of the four stroke engine lies between
20-30%, where as
▪ The thermal efficiency of six stroke engine lies between 40-50%.
17.
18. • BRAKE SPECIFIC FUEL CONSUMPTION:
• It is the ratio of fuel consumption per second to the brake power.
• As from the diagram the brake specific fuel consumption of 6-stroke engine is
much lower than the conventional six stroke engine.
19. Engine Modifications
• 1.Fuel Tank:
• The Fuel tank in a six stroke engine has to be divided into two parts.
One part will contain fuel and other part will contain water.
• The water used should be distilled and pure.
• 2.Materials Used For Engine Components:
• The engine components are subjected to thermal stresses developed due
to injection of water into the superheated cylinder. The rapid temperature
changes can cause micro cracking or fracture of the engine components
due to continuous compression and expansion.
20. • For this purpose the engine components are manufactured using
thermal resistant alloys like:
• I. Silicon Carbide.
• ii. Zirconia.
• iii. Alumina-Tungsten Alloys.
• 3.Cam Shaft Design:
• ▪In traditional four stroke engines the angular speed of the camshaft is
half of the crankshaft. The Cam rotates ones for every two revolutions of
the cam.
• ▪In six stroke engine the camshaft has been designed to turn one
revolution for every three revolutionof the crankshaft.
21. • ▪The camshaft of 6-stroke engine contains three cams.
• I. Intake Cam.
• ii. Exhaust Cam.
• iii. Water Injector Cam.
22. • 4.Water Injector:
• ▪The water injection is done by the help of water injector which is
operated by the cam. This thing can be done more effectively by the use
of water metering.
• ▪Water metering pump is a positive displacement pump capable of
driving a fixed quantity of water into the cylinder at regular intervals.
23. • Progressive cavity pump:
• It is a screw pump positive displacement variant. In this the working fluid
passes through series of discrete cavities as rotor is turned. The pump is
to be synchronized with the output shaft of the engine with a reduction
gear of 3:1 ratio.
24. Advantages Of Six Stroke Engine
• 1.Due to an additional power stroke efficiency of the engine
increased.
• 2.Better scavenging and more extraction of work .
• 3.Reduction in fuel consumption by at least 40%.
• 4.No cooling system required like heat exchanger in case of
Crower six stroke engine.
• 5.Reduction in pollutants like NOx, CO ,CO2,photochemical
smog etc., up to 55%.
• 6.Increase in indicated thermal efficiency.
• 7.Minimize necessity of heat exchanger e.g. radiator.
25. Limitations Of Six Stroke Engine
• Early engine starting problem: As the engine is not sufficiently hot at
the starting the water injection stroke cannot be taken place. So a prime
mover is used to run the engine for some cycle and after heating of the
cylinder it is cut out.
• Running problem in cold region: As the temperature in cold region is
low there might be problem in case of water injection stroke as the
cylinder temperature is low.
• Requirement of neutral water: As the steam is generated in 2nd power
stroke, if the water is not neutralized it may react with the cylinder wall
and with the piston top which results cavitation and distortion of the
metal. It causes the uneven heat transfer between the water droplets and
the cylinder wall which may decrease the performance of the engine. And
it is difficult to carry neutral water all the times.
26. • 4.Engine size increases due to additional components.
• 5.Higher manufacturing costs.
• Conclusion:
• Six stroke engine has many advantages like high thermal efficiency, low fuel
consumption, high break mean effective pressure, low emission. However
drawbacks like initial starting problem, availability of water are also associated.
The starting problem can be Can be eliminated by using heater or glow plug
and coupling a dc motor as prime mover to the engine. Now a days research and
experiments are going on to modify the engine further and to make it for
practical purpose.
27. BEARE HEAD SIX STROKE ENGINE
• Introduction: Malcolm beare built an innovative hybrid design
of the I C engine , by combining a two stroke with a four stroke
engine.
• The Beare Head is a new type of four stroke engine head
design known as the “Beare Head”.
• The Beare Head uses a piston and ports very much like a two
stroke engine to replace the over head valve system that is
found in four stroke engines today. The four stroke block, pistons
and crankshaft remain unaltered. This combination of two stroke
and four stroke technology has given the engine its name – the
“six stroke engine” (2 + 4 = 6).
28.
29. • ABOUT ENGINE : Below the cylinder head gasket, everything
is conventional, so one advantage is that the Beare concept can
be transplanted on to existing engines without any need for
redesigning or retooling the bottom end. But the cylinder head
and its poppet valves get thrown away. To replace the camshaft
and valves, Beare has retained the cam drive belt and fitted an
ultra short-stroke upper crankshaft complete with piston,
which the belt drives at half engine speed just as it previously
drove the cam. This piston drives up and down in a sleeve, past
inlet exhaust ports set into the cylinder wall, very much like on
a two stroke: these are all exposed during both inlet and
exhaust strokes.
30.
31. FIGURE WISE EXPLANATION:
1. Fuel ignites with piston at the top dead center.
2. Rotary valve opens, allowing exhaust to escape.
3. Exhaust stroke begins when the piston is at bottom dead center.
4. Exhaust stroke ends, intake begins. Rotary valve cuts exhaust .intake of charge into cylinder due
to Pressure difference.
5. The intake stroke happens when the piston is on its downward path with the intake valve open.
This action creates suction, drawing atomized fuel in this case gasoline mixed with air, into the
Combustion chamber.
6. Top piston nearly closes complete inlet port and The Compression begins.
7. Combustion Chamber completely sealed and ready for the combustion.
8. The power stroke begins at a critical moment, just as the air fuel mixture is at its most
compressed. A supercharged voltage is delivered to the spark plugs from the ignition coil, at that
point it ignites the fuel mixture. The valves in the engine are still closed during this period. Thus
the explosion forces the piston down to turn the engine's crankshaft, delivering the power via the
gearbox and clutch to the driving wheels.
35. CONCLUSION:
1. In a six stroke engine the energy absorption is less because of slower
acceleration of reciprocating parts.
2. It reduces the weight and complexity of the engines head by as much
as 50%. Instead of using energy to drive the head.
3.Torque is increased by 35% and efficiency increased by the same.
4.Increased torque and power output.
36.
37.
38.
39. Gallery
UPPER CRANK WITH
PISTON
DISC VALVE : The piston is
half way up on the exhaust
stroke. When the piston reaches
TDC with the ports fully open,
the disk will begin to cut off the
exhaust. The valve runs
clockwise.
41. THERMODYNAMIC ADVANTAGES:
The intake begins at 0 degrees on the X-axis. The effect of the
additional volume changes that the upper piston has on the volume of
the engine is all positive from a thermodynamic point of view. If the
engine were a normal 4 stroke the cylinder capacity would be 340cc. Of
note – maximum volume at the end of the intake stroke occurs at 173
degrees instead of 180 degrees- the change in volume is 308cc which is
less than a 4 stroke (340cc)- yet the total volume at the end of the
intake stroke is 415cc as opposed to 375cc for a conventional stroke.
The change in volume during the compression stroke is slightly
greater than a 4 stroke after the ports are closed.
The expansion stroke is much greater than a 4 stroke, both from
T.D.C. to B.D.C. and from T.D.C. till the exhaust port is open.
42. It is possible to leave the opening of the exhaust port later than in a 4
stroke because maximum volume is not reached until after B.D.C.-548
deg. Instead of 540 deg.
Hence the 6 stroke system is better from a thermodynamic point of view
because more energy is extracted from the expansion process.
During the critical combustion period the rate of change in volume in
the 6 stroke is less than a 4 stroke. Minimum volume is not reached
until after T.D.C., at 361 deg. This is because of the phasing of the upper
piston. It is retarded in reaching its T.D.C. until 20 deg. after T. D.C.
(380). This is much better from a thermodynamic view in that
combustion occurs at a more constant volume; hence ignition timing is
not as critical as in a 4 stroke. There is room in the combustion chamber
for up to 4 spark plugs and two direct injectors if needed.
43. Conclusion:
In a six stroke engine the energy absorption is less because of slower
acceleration of reciprocating parts The piston speed of the upper piston is
about a quarter of the main piston; therefore its service life should be at
least twice that of the main piston.
In the Beare design, per single cylinder, the number of parts is 15
compared to a four stroke of approx. 40 to 50 parts. Also, to reduce
manufacturing costs the head and block can be machined in one piece.
The bottom piston is a standard design and the Beare Head bolts
directly onto the engine block replacing the overhead valves and standard
head.
It reduces the weight and complexity of the engines head by as much
as 50%. Instead of using energy to drive the head, the head actually
develops energy for conversion to power back through the timing chains of
an engine.
44. Torque is increased by 35% and efficiency increased by the same. This
can be achieved By simply unbolting an existing head of a four-stroke
engine and then bolting on a Beare Head.
Increased torque and power output.
Better fuel economy and cleaner burning longer service intervals and
considerably reduced tooling costs when compared with a conventional four
stroke design.
45. References:
• 1. www.sixstroke.com
• 2. Excerpts from Beare technology.
• 3. High speed internal combustion engines by John B. Heywood.
• 4. http://www.jack-brabham-engines.com/
• 5. http://www.autocarindia.com/new/Information.asp?id=1263
• 6. www.seminarsonly.com