Describe and illustrate a four-stroke cycle internal combustion engine.
What will be an ideal response?
The four-stroke cycle is a mechanical cycle, with two revolutions for every
power cycle. One revolution involves intake and compression processes,
and the other involves power and exhaust processes. The strokes are the
following:
1. Intake stroke: The intake valve is open. The exhaust valve is initially open,
but it closes and the piston moves downward, bringing fresh air/fuel
mixture into the cylinder.
2. Compression stroke: The intake and exhaust valves are closed. The
air/fuel mixture is compressed by upward piston movement.
3. Power stroke: The intake and exhaust valves are closed. Spark ignition
and combustion occur, with the resultant pressure increase forcing the
piston downward.
4. Exhaust stroke: The exhaust valve is open, and the intake valve is closed.
The upward movement of the piston forces the products of combustion
(exhaust) from the engine.
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