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An internal combustion engine (ICE) is a heat engine where the combustion of a fuel occurs with air in a combustion chamber.
The expansion of the high-temperature and high-pressure gases produced by combustion apply direct force to pistons.
This force moves the component over a distance, transforming chemical energy into useful mechanical energy.

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Cylinder, Piston, Crankshaft, Camshaft, Timing Belt, Spark plug ...