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Stroke ratio

Bore/Stroke comparison

Stroke ratio, today universally defined as bore/stroke ratio, is a term to describe the ratio between cylinder bore diameter and piston stroke length in a reciprocating piston engine. This can be used for either an internal combustion engine, where the fuel is burned within the cylinders of the engine, or external combustion engine, such as a steam engine, where the combustion of the fuel takes place outside the working cylinders of the engine.


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Hubverhältnis German Relación diámetro/carrera Spanish Iskusuhde Finnish Rapporto alesaggio/corsa Italian ボアストローク比 Japanese Boring-slagverhouding Dutch

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