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 ?
While Singh unfurled his range of power strokes, Sean Terry (20) dropped anchor as the pair shared a fourth wicket partnership of 79 in 146 deliveries.
To his credit, Mrktchian battled back, winning a few games with power strokes.
Durham had set Surrey an unlikely 447 to win after some magnificent power strokes from Liam Plunkett had given the England player a 42-ball half-century.
A steam engine has two power strokes for every crankshaft turn and a 4-cycle engine has one power stroke for every two turns.
Moreover, we show that the power strokes of these limbs are coordinated into a four-paddled gait that seems to be unique among aquatic arthropods.
As reported previously, power strokes of both the antennulae and antennae provide thrust for drag-based swimming (Skogsberg, 1920; Schreiber, 1922; Kesling, 1951; contra Canon, 1924, who reported that the antennulae were not involved in swimming).
In this species, the relative timing of limb movements is consistent: power strokes of the left antennula and right antenna are nearly synchronized, as are the strokes of the right antennula and the left antenna.
Former Wimbledon champions Pat Cash and Goran Ivanisevic are well versed in the art of entertainment, with plenty of joking mixed with the occasional power strokes in their legends meeting.
Cam design also influences the travel path of the nocking point during draw and power strokes.
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.