3 hp 4 stroke internal combustion engine
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Yet, alternative engine designs can offer some potential advantages and continue to be explored. Internal combustion engines consisting of a piston reciprocating in a cylinder and connected by a connecting rod to a crankshaft-most commonly four-stroke diesel and spark-ignited engines-have become entrenched for many applications for at least a century. These alternative designs include rotary engines, such as the Wankel engine, two-stroke engines, as well as six-stroke and split-cycle engines.
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Abstract: While the four stroke diesel and gasoline engines have been firmly entrenched for most applications, alternative combustion engine concept have been pursued that can offer improved efficiency, power density, and other potential advantages.