power stroke


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Related to power stroke: Intake stroke

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 ?
At the end of the power stroke, thoracopods come together, and each setal fan closes into a tight bundle of setae--setules fold up to lie flush with adjoining setae, and setae lie parallel (Fig.
"The system," says Ives, "is specific to the 3.0-liter, but is very similar to what is used on the 6.7-liter Power Stroke. Much of what we learned there has been put into use on the new engine."
Due to the long power stroke, it was the most difficult crossbow to cock.
Yet even before those difficult times, when Ford was still Navistar's top engine customer and the diesel pickup truck market was booming, there were those within Navistar who were beginning to consider the what-ifs and ponder the implications of what things would be like without the Power Stroke business.
* The Butterfly: This is similar to the breaststroke (in fact, it used to be considered just a variation of the breaststroke), except that instead of pushing your hands forward through the water before bringing them back in a power stroke, you swing them forward above the water.
Gillette executives say consumers will pay a premium for performance, claiming the M3Power outperforms all men's shaving systems, including Gillette's category-leading Mach3 Turbo, by shaving more hair, closer in one easy power stroke.
The M3Power outperforms all men's shaving systems, including Gillette's own category-leading Mach3 Turbo, in closeness and comfort, by shaving more hair more closely in one easy power stroke, says a Gillette spokesman.
The power packs provide an air operated fast approach followed by an automatically initiated combined pneumo-hydraulic power stroke on contact with the work piece.
The wingbeat begins with a power stroke (also called the downstroke), in which the bird pulls its wings forward and downward, creating lift over the wing.
With a machined aluminum front riser and split limbs with alloy energy wheels, the Durango features a 17-inch power stroke, precision-machined track, hard-anodized Teflon impregnated barrel, a patented dry-fire prevention system and positive safety.
In Otto cycle versions, a spark plug located on the crest ignites the air/fuel mixture, initiating the power stroke. In the diesel version, high compression sets the mixture aflame.