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- ...ston) rather than four. Thus, there is a power stroke per piston for every engine revolution, instead of every second revolution. Two-stroke engines can be a [[Image:Arbeitsweise Zweitakt.gif|center|thumb|500px|A two-stroke engine with an expansion pipe illustrating the effect of the reflected pressure wa19 KB (3,049 words) - 09:48, 2 August 2009