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:
“I should like to suggest that at least on the face of it a stroke by stroke story of a copulation is exactly as absurd as a chew by chew account of the consumption of a chicken’s wing.”
—William Gass (b. 1924)
“People are lucky and unlucky not according to what they get absolutely, but according to the ratio between what they get and what they have been led to expect.”
—Samuel Butler (1835–1902)