A four-stroke engine converts fuel into motion through a four step cycle: 1) Intake of air-fuel mixture into the cylinder, 2) Compression of the mixture, 3) Combustion of the compressed mixture which creates motion, 4) Exhaust of exhaust gases out of the cylinder. It is the most common car engine type because it is relatively efficient and inexpensive to produce compared to other internal combustion engines.

1. PRESENTAION ON 4 STROKE
ENGINES

2. The Basics
• A four-stroke engine:
• Is an internal combustion engine
• Converts fuel into motion
• Is the most common car engine type
• Is relatively efficient
• Is relatively inexpensive

3. Basic Engine Terminology
• Stroke
• Bore
• Piston
• Cylinder
• Crankshaft
• Connecting Rod
• Valve
• Spark Plug

5. 4 Stroke Cycle
1. Intake
2. Compression
3. Combustion
4. Exhaust

6. • Intake- process of filling the
cylinder with the proper air-fuel
mixture through the intake valve.

7. • Compression- the process of
compressing the air-fuel mixture in
the cylinder to make it more
combustible

8. • Combustion-the process of igniting
the compressed air-fuel mixture to
create motion and the over all
power of the engine.

9. • Exhaust- the process of releasing
the exhaust out of the cylinder
through the exhaust valve.