four-stroke cycle

four-stroke cycle
: a cycle in which air or an explosive mixture is drawn into the cylinder of an internal-combustion engine on a suction stroke, is compressed and ignited on a compression stroke, burns and performs useful work on an expansion stroke, and expels the products of combustion on an exhaust or scavenging stroke

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four-stroke cycle noun
(in an internal-combustion engine) a recurring series of four strokes of the piston, comprising an out-stroke drawing the mixed gases into the cylinder, an in-stroke compressing them, an out-stroke impelled by their explosion and working the engine, and an in-stroke driving out the burnt gas
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Main Entry:four

Useful english dictionary. 2012.

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