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Automotive glossary: What is a Cylinder?

Definition of Cylinder: In combustion engines the impulsion comes from the pressure, a burning gas impinges on a piston and thereby driving it down in a cylinder. The cylinder is a husk formed hollow from metal, in which the piston moves up and down. Piston ring ensure for the necessary sealing. The running surface, in other words the inner surface of the cylinder, is lined with insets of a harder material. In a two-stroke gasoline engine, there are holes in the running surface, so that the piston also contributes to the inlet and outlet control. On air cooled engines, the cylinder is also provided with radiators, on water cooled engines it is traversed by cooling liquid for cooling purposes. For lubrication purposes, the cylinder running surface is splattered with oil from the crank case side. The piston rings wipe it off again, when moving down. On four-stroke gasoline engines with overhead camshafts, the cam chain usually runs through the cylinder block too.

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