internal combustion engine a type of engine that is used for most vehicles an engine in which the fuel is burned within engine cylinders....
Reciprocating internal combustion engines—a subclass of heat engines—can be operated in the four- and two-stroke cycles. In each case, the engine may be equipped with either a spark-ignited (SI) or a compression-ignited (CI) combustion system. A number of other engine classifications are possible, based on engine mobility, application, fuel, configuration, and other design parameters. The combustion process can be theoretically modeled by applying laws of mass and energy conservation to the processes in the engine cylinder. Basic design and performance parameters in internal combustion engines include compression ratio, swept volume, clearance volume, power output, indicated power, thermal efficiency, indicated mean effective pressure, brake mean effective pressure, specific fuel consumption, and more.
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