Cylinder (engine)

Combustion engine block tube in which a piston operates / From Wikipedia, the free encyclopedia

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In a reciprocating engine, the cylinder is the space in which a piston travels.[1]

The inner surface of the cylinder is formed from either a thin metallic liner (also called "sleeve") or a surface coating applied to the engine block. A piston is seated inside each cylinder by several metal piston rings,[1] which also provide seals for compression and the lubricating oil. The piston rings do not actually touch the cylinder walls, instead they ride on a thin layer of lubricating oil.