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Stroke (engine)
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<p>In the context of an <a href="/facts/Internal_combustion_engine/Ju4BXzj0">internal combustion engine</a>, the term stroke has the following related meanings: </p> <ul><li>A phase of the engine's cycle (e.g. compression stroke, exhaust stroke), during which the piston travels from top to bottom or vice versa.</li> <li>The type of power cycle used by a piston engine (e.g. <a href="/facts/Two-stroke_engine/Al4uUeo9">two-stroke engine</a>, <a href="/facts/Four-stroke_engine/70vDIDvJ">four-stroke engine</a>).</li> <li>"Stroke length", the distance travelled by the <a href="/facts/Piston/z7pN46u7">piston</a> during each cycle. The stroke length, along with <a href="/facts/Bore_(engine)/HQjzTl2Y">bore diameter</a>, determines the engine's <a href="/facts/Engine_displacement/qkHXacPv">displacement</a>.</li></ul>