Back أسطوانة (محرك) Arabic Цыліндр (рухавік) Byelorussian Cilindre (motor) Catalan Válec (motor) Czech Cylinder (motordel) Danish Zylinder (Technik) German Cilindro (motoro) Esperanto Cilindro (motor) Spanish Silinder (mootori osa) Estonian Zilindro (motorra) Basque
In a reciprocating engine, the cylinder is the space in which a piston travels. 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, 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.