Bore (engine)

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Bore, is a term used in describing a part of a piston engine. Also known as 'cylinder bore' it also represents the size, in terms of diameter, of the cylinder in which a piston travels. The value of a cylinders bore, and stroke, is used to establish the displacement of an engine.[1]

The term "bore" can also be applied to the bore of a locomotive cylinder or steam engine pistons.


  1. Schwaller, Anthony (1999). Motor Automotive Technology. Delmar, New York

See also