The document discusses different types of internal combustion (IC) engines. It states that IC engines have fuel combustion that occurs inside the cylinder, unlike external combustion engines where combustion is external. IC engines can be classified in several ways, including by ignition system (spark ignition or compression ignition), fuel type (petrol or diesel), working cycle (Otto or diesel), number of strokes per cycle, number of cylinders, and cylinder arrangement. Key parts of IC engines are also outlined such as the cylinder, piston, valves, camshaft, crankshaft, and others.

1. IC ENGINE
By Vineeshkumar
Lecturer
SNM Polytechnic College

2. ENGINE
An engine or motor is a machine designed to convert one
or more forms of energy into mechanical energy. Available
energy sources include potential energy, heat energy,
chemical energy, electric potential and nuclear energy.

3. TYPES OF ENGINE
EC ENGINE IC ENGINE

4. EC ENGINE
The fuel combustion takes place outside
the cylinder.

5. IC ENGINE
The fuel combustion takes place inside
the cylinder.

6. CLASSIFICATION OF IC ENGINE
 Based on ignition system
 Based on type of fuel used
 Based on the working cycle
 Based on the number of stroke per cycle
 Based on the number of cylinders
 Based on cylinder arrangement

7. Based on the ignition system
Spark Ignition (SI) Engine Compression Ignition (CI) Engine
 An electric spark is used
for igniting the air fuel
mixture.
 Example. Petrol Engine
 Heat energy of the
compressed air is used for
igniting the fuel.
 Example. Diesel Engine

8. Based on the fuel used
Petrol Engine Diesel Engine
 Uses petrol as the fuel
 Works on the Otto cycle
 Air and the fuel are mixed in a
carburetor
 Fuel is ignited with an electric
spark
 Relatively low compression ratio
 Relatively low amounts of power
is produced in a Petrol engine
 Highly volatile fuels are used in
these internal combustion engines
 Used in light vehicles such as
motorcycles and cars
 High fuel consumption
 Comparatively low initial cost and
maintenance cost
 Uses diesel as the fuel
 work on the Diesel cycle
 The fuel is mixed with air inside
the cylinder
 Ignition is achieved with the help
of the hot, compressed air.
 High compression ratio
 High power production
 These engines work with fuels that
have low volatilities
 Generally used in heavy vehicles
such as trucks and buses.
 Relatively low fuel consumption.
 High initial and maintenance costs

9. Based on the working cycle
Otto cycle Diesel cycle
 Engine which works on
the basis of Otto cycle
 Example. Petrol engine
 Engine works on the
basis of Diesel cycle
 Example. Diesel Engine

10. Based on number of stroke per cycle
2 Stroke Engine
1cycle of engine
is completed in 2 strokes

11. Working of 2 stroke engine

12. SCAVENGING
Scavenging is the process of replacing the exhaust gas in
a cylinder of an internal combustion engine with the
fresh air/fuel mixture for the next cycle. If scavenging is
incomplete, the remaining exhaust gases can cause
improper combustion for the next cycle, leading to
reduced power output.

13. Types of IC Engine Based
on number of stroke
4 Stroke Engine
1cycle of engine
completed in 4 strokes

14. Working of 4 stroke engine

15. PETROL ENGINE

16. DIESEL ENGINE

17. Based on Cylinder arrangement

18. ENGINE PARTS
 Cylinder
 Piston
 Connecting rod
 Crankshaft
 Inlet valve
 Exhaust valve
 Camshaft

19. ENGINE PARTS
 Cylinder block
 Cylinder head
 Flywheel

20. Valve mechanism

21. Thank you