3
Engine work cycle
Each 4-stroke petrol engine has the following 4 processes the completion of these 4 processes is termed as one cycle
of the engine work.
1、 Suction: air and fuel mixture is sucked inside the cylinder
2、 Compression: air and fuel mixture is being compressed in cylinder
3、 Power : after spark, mixture explodes and expand to push dam
piston, thus crankshaft output machanical energy through con-rod.
4、 Exhaust : the gases are expelled
4 - s t r o k e e n g i n e w o r k c y c l e
A：
：：
：SUCTION STROKE
1、 The crankshaft turns in the counter clockwise direction
2、 The motion of the crankshaft acts on the con-rod to pull the
piston down.
3、 As the piston moves from TDC to BDC, the intake valve
opens and air-fuel mixture is drawn into cylinder
B：
：：
：Compression stroke
1、 The crankshaft continues running, and brings the
piston goes from the BDC to the TDC by the connecting rod.
2、 The mixing air is pressed into a narrow room between the
cylinder head and the top of piston which is called firebox.
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