4
C：
：：
：Power stroke
1. Spark plug lights the compressed air- fuel mixture.
2. The combustion of air-fuel mixture causes the
the temperature and the pressure increase in the
firebox, the air expands, the power forces the piston
to push the protuberance down.
3. The power forced on the plug transfers to the
crankshaft through connecting rod, then the crankshaft
speeds up, the expanding of mixed air provides
power for the engine.
D：
：：
：Exhaust stroke
1、The air outtake valve opens when the piston goes
The bottom of the process.
2、The revolvable crankshaft pushes the piston towards the
cylinder head because of inertia.
3、Then the piston goes towards the cylinder head, the
burning gas is pushed out from air outtake valve, the
air outtake valve closes when piston reach the top end
of process.
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