Internal Combustion (IC) engine convert chemical energy in a mixture of air and liquid or gaseous fuel into thermal energy in the engine cylinder. This is done in four stroke cycle engines, two stroke cycle engines, or diesel engines.
A complete cycle consisting of four strokes of the piston:
1. intake,
2. compression and combustion,
3. expansion,
4. exhaust
Starting with the piston at the top of the stroke, the fuel-air mixture, previously proportioned and atomized in the a carburetor, is drawn in to the cylinder during the first downward stroke. When the piston nears the top of this stroke, a spark plug fires igniting the gas. The pressure developed during combustion drives the piston downward. At the bottom of the stroke, the exhaust valve opens, and the combustion gasses are rejected during the next upward stroke.
Source: Engineering Problem Solving by Milton C. Shaw
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