power stroke

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power stroke

[′pau̇·ər ‚strōk]
(mechanical engineering)
The stroke in an engine during which pressure is applied to the piston by expanding steam or gases.

power stroke

The stroke in the operating cycle of a reciprocating engine in which both the inlet and the exhaust valves are closed, the fuel-air mixture has been ignited and burned, and the piston is being forced downward by expanding gases. See four-stroke cycle.
References in periodicals archive ?
This somewhat violent transfer occurs upon release--the power stroke.
For an additional feel of smoothness--at the shot--some cam designers add a heavy tungsten disk in their cams to help counteract the shock at the end of the power stroke.
The repetition of these four combustion cycles produces sixteen power strokes for each revolution of the cylinder block.
Its use of the two-stroke combustion cycle allows the valvetrain to be eliminated and provides double the number of power strokes.
It has a stroke length of 14 inches and its brilliant design delivers an astonishing four power strokes per revolution.
The Rand Cam engine also has a stroke length of approximately 14 inches and its unique design provides four power strokes per revolution.