In a reciprocating piston engine, the stroke ratio, defined by either bore/stroke ratio or stroke/bore ratio, is a term to describe the ratio between cylinder bore diameter and piston stroke. 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.
While the stroke ratio can provide insight into the goals of an engine's designer, it has no direct effect on the speed at which an engine reaches maximum torque.
Read more about Stroke Ratio: Conventions, Square, Oversquare and Undersquare Engines
Famous quotes containing the words stroke and/or ratio:
“Every new stroke of civilization has cost the lives of countless brave men, who have fallen defeated by the “dragon,” in their efforts to win the apples of the Hesperides, or the fleece of gold. Fallen in their efforts to overcome the old, half sordid savagery of the lower stages of creation, and win the next stage.”
—D.H. (David Herbert)
“Official dignity tends to increase in inverse ratio to the importance of the country in which the office is held.”
—Aldous Huxley (1894–1963)