A six stroke engine derived its name from the fact that it is a mixture of two and four stroke engine.

1. HI-TECH INSTITUTE OF ENGG. AND TECHNOLOGY
GHAZIABAD(U.P.)
Submitted To:
Mr. Neeraj Kumar
SUBMITTED BY:
NAME - SUMIT KUMAR BISWAS
COURSE - B-TECH

2. SIX STROKE ENGINESIX STROKE ENGINE

3. ContentContent
IntroductionIntroduction
Principle of Two Stroke EnginePrinciple of Two Stroke Engine
Principle of Four Stroke EnginePrinciple of Four Stroke Engine
Concept of Six Stroke EngineConcept of Six Stroke Engine
Types of Six Stroke EngineTypes of Six Stroke Engine
ConstructionConstruction
Working of Six Stroke EngineWorking of Six Stroke Engine
AdvantagesAdvantages
ConclusionConclusion

4. IntroductionIntroduction
A six stroke engine derived its name fromA six stroke engine derived its name from
the fact that it is a mixture of two and fourthe fact that it is a mixture of two and four
stroke engine.stroke engine.
This engine is a radical hybridization ofThis engine is a radical hybridization of
two and four stroke engine that the toptwo and four stroke engine that the top
portion of two stroke engine and theportion of two stroke engine and the
bottom rather the middle section of a fourbottom rather the middle section of a four
stroke engine.stroke engine.

5. Principles of Two StrokePrinciples of Two Stroke
• Two stroke enginesTwo stroke engines
got its name from thegot its name from the
fact that the requiredfact that the required
strokes are completedstrokes are completed
in one revolution.in one revolution.
• In short there is oneIn short there is one
power stroke in onepower stroke in one
revolution.revolution.

6. Principles of Four StrokePrinciples of Four Stroke
In the case of fourIn the case of four
stroke engines, thestroke engines, the
four strokes arefour strokes are
completed in twocompleted in two
revolutions.revolutions.
There is a singleThere is a single
power stroke in twopower stroke in two
revolutions.revolutions.

7. Concept of Six StrokeConcept of Six Stroke
This technology is also known as BeareThis technology is also known as Beare
Technology.Technology.
This engine got its name due to itsThis engine got its name due to its
construction.construction.
This engine is a radical hybridization ofThis engine is a radical hybridization of
two and four stroke engines.two and four stroke engines.
These types of engines have manyThese types of engines have many
advantages compared to OHC four strokeadvantages compared to OHC four stroke
engines.engines.

8. Types of Six stroke engineTypes of Six stroke engine
There are three types of six strokeThere are three types of six stroke
Engine.Engine.
1)1)Crower six stroke engine.Crower six stroke engine.
2)2)Beare Head six stroke engine.Beare Head six stroke engine.
3)3)Bajulaz six stroke engine.Bajulaz six stroke engine.

9. 1. Crower Six Stroke Engine1. Crower Six Stroke Engine
This engine is made in U.S by Bruce Crower, after theThis engine is made in U.S by Bruce Crower, after the
exhaust stroke ,fresh water is injected into the cylinder, andexhaust stroke ,fresh water is injected into the cylinder, and
is quickly turned to superheated steam, which causes theis quickly turned to superheated steam, which causes the
water to expand to 1600 times its volume and forces thewater to expand to 1600 times its volume and forces the
piston down for an additional stroke.piston down for an additional stroke.
The design also claims to reduce fuel consumption byThe design also claims to reduce fuel consumption by
40%.40%.
Crower’s six stroke engine features:-Crower’s six stroke engine features:-
1)1)No cooling system required.No cooling system required.
2)2)Improves a typical engine’s fuel consumption.Improves a typical engine’s fuel consumption.

10. 2.2. Beare Head Six Stroke EngineBeare Head Six Stroke Engine
This engine simply replaces theThis engine simply replaces the
convectional four stroke enginesconvectional four stroke engines
cylinder head. The manufacturerscylinder head. The manufacturers
four stroke bottom end remainsfour stroke bottom end remains
unchanged.unchanged.
The net result in:The net result in:
1)1)Power torque increases of 30%.Power torque increases of 30%.
2)2)Lower maintenance cost due toLower maintenance cost due to
less wearing port.less wearing port.
3)3)Simpler and less expensiveSimpler and less expensive
manufacturing and tooling.manufacturing and tooling.

11. 3.3. Bajulaz Six Stroke EngineBajulaz Six Stroke Engine
The bajulaz six stroke engine isThe bajulaz six stroke engine is
similar to a regular combustionsimilar to a regular combustion
engine in design . This Engine wasengine in design . This Engine was
invented in 1989 by the Bajulaz S A.invented in 1989 by the Bajulaz S A.
Features:Features:
1)1)Reduction in fuel consumption by atReduction in fuel consumption by at
40%.40%.
2)2)Two expansions in six stroke.Two expansions in six stroke.
3)3)Dramatic reduction in pollution.Dramatic reduction in pollution.
4)4)Liquefied petroleum gas.Liquefied petroleum gas.

12. ConstructionConstruction
It consist the basicIt consist the basic
components of a rotarycomponents of a rotary
disc induction two-strokedisc induction two-stroke
engine.engine.
It is grafted on to a four-It is grafted on to a four-
stroke, to produce thestroke, to produce the
best of both worlds.best of both worlds.

13. Working of Six Stroke EngineWorking of Six Stroke Engine
1)1) Intake ValveIntake Valve
2)2) Heating chamber valveHeating chamber valve
3)3) Combustion chamber valveCombustion chamber valve
4)4) Exhaust valveExhaust valve
5)5) CylinderCylinder
6)6) Combustion ChamberCombustion Chamber
7)7) Air Heating ChamberAir Heating Chamber
8)8) Wall of Combustion ChamberWall of Combustion Chamber
9)9) Fuel InjectorFuel Injector
10)10)Heating PlugHeating Plug
11)11)PistonPiston
12)12)CrankshaftCrankshaft

14. 11stst
Stroke(Suction Stroke)Stroke(Suction Stroke)
The inlet valve(1) is keptThe inlet valve(1) is kept
open.open.
The piston movesThe piston moves
Downward which result inDownward which result in
the formation of pressurethe formation of pressure
difference due to whichdifference due to which
pure air enter thepure air enter the
cylinder(5).cylinder(5).
The crankshaftThe crankshaft
completes rotates for halfcompletes rotates for half
cycle.cycle.

15. 22ndnd
Stroke(Compression Stroke)Stroke(Compression Stroke)
The inlet valve closes andThe inlet valve closes and
the heating chamberthe heating chamber
valve open.valve open.
The Piston movesThe Piston moves
upwards due to crankingupwards due to cranking
forcing the pure air intoforcing the pure air into
heating chamber.heating chamber.
The air at the Stage isThe air at the Stage is
converted to highconverted to high
pressure.pressure.

16. 33rdrd
Stroke(1Stroke(1stst
Power Stroke)Power Stroke)
The Combustion chamber valve opens and theThe Combustion chamber valve opens and the
gases of combustion enter the cylinder.gases of combustion enter the cylinder.

17. 44thth
Stroke(Exhaust Stroke)Stroke(Exhaust Stroke)
The exhaust valve opens.The exhaust valve opens.
The piston movesThe piston moves
upwards and the exhaustupwards and the exhaust
gases are removed bygases are removed by
this valve.this valve.
The crankshaft rotatesThe crankshaft rotates
another half cycle.another half cycle.
At this stage theAt this stage the
crankshaft completes 2crankshaft completes 2
full cycles.full cycles.

18. 55thth
Stroke(2Stroke(2ndnd
Power Stroke)Power Stroke)
The heating chamberThe heating chamber
valves opens and thevalves opens and the
pure air at high pressurepure air at high pressure
and high temperatureand high temperature
enters the cylinder asenters the cylinder as
shown in fig.shown in fig.
Which does work on theWhich does work on the
piston hence its movespiston hence its moves
downwards resulting 2downwards resulting 2ndnd
power stroke.power stroke.
The crankshaft completesThe crankshaft completes
another half cycle.another half cycle.

19. 66thth
StrokeStroke
Finally the combustionFinally the combustion
chamber valve open thechamber valve open the
piston moves upwardspiston moves upwards
forcing the pure air intoforcing the pure air into
combustion chamber.combustion chamber.
The crankshaft willThe crankshaft will
complete 3 full cycle atcomplete 3 full cycle at
the end of 6the end of 6thth
stroke.stroke.

20. Thermodynamic AdvantagesThermodynamic Advantages
The Six stroke is thermodynamically more efficientThe Six stroke is thermodynamically more efficient
because the change in volume of the power stroke isbecause the change in volume of the power stroke is
greater than the intake, compression, & exhaust strokes.greater than the intake, compression, & exhaust strokes.

21. Torque-Angle diagramTorque-Angle diagram
There’s improved torque at lower revs, which will surely help in theThere’s improved torque at lower revs, which will surely help in the
stop-and-go nature of congested Indian traffic.stop-and-go nature of congested Indian traffic.
The six-stroke version produced the same torque as the four-strokeThe six-stroke version produced the same torque as the four-stroke
conventional motor 1000rpm lower down the rev scale, as well asconventional motor 1000rpm lower down the rev scale, as well as
making exponentially more torque as revs rose.making exponentially more torque as revs rose.

22. AdvantagesAdvantages
The compression ratio can be increasedThe compression ratio can be increased
because of the absence of hot spots.because of the absence of hot spots.
The absence of valves within theThe absence of valves within the
combustion chamber allows designcombustion chamber allows design
freedom.freedom.
One-piece engine from crankshaft toOne-piece engine from crankshaft to
upper shaft becomes feasible. No headupper shaft becomes feasible. No head
gasket.gasket.
There are no valves to drop or bounce.There are no valves to drop or bounce.

23. AdvantagesAdvantages
Gas flow on intake increase of 20%.Gas flow on intake increase of 20%.
Possibility of engine damage if the timing belt slipsPossibility of engine damage if the timing belt slips
or snaps.or snaps.
Increased torque and power output.Increased torque and power output.
Better fuel economy.Better fuel economy.
Cleaner burning and reduced emissions.Cleaner burning and reduced emissions.
Longer service intervals.Longer service intervals.
Reduced tooling cost.Reduced tooling cost.
Low cost of manufacturing.Low cost of manufacturing.
Low machining cost due to absence of valves.Low machining cost due to absence of valves.
Higher compression ratio.Higher compression ratio.

24. ConclusionConclusion
The industry trend away from cheaper two-The industry trend away from cheaper two-
stroke power in favor of costlier but cleaner four-stroke power in favor of costlier but cleaner four-
stroke engines in both Europe, Japan and Southstroke engines in both Europe, Japan and South
East Asia makes a concept like the Beare six-East Asia makes a concept like the Beare six-
stroke, which offers the best of both worlds,stroke, which offers the best of both worlds,
project a strong case towards volumeproject a strong case towards volume
manufacture.manufacture.
150cc six-stroke Taiwanese single-cylinder bike150cc six-stroke Taiwanese single-cylinder bike
from Yingang is ready to roll.from Yingang is ready to roll.