Cylinder (engine)
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In an engine, the cylinder is the space in which a piston travels.
PSA TU engine block with wet liners.
Piston ring
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A piston ring is a metallic split ring that is attached to the outside of a piston in an internal combustion engine or steam engine.
Cylinder (engine)
…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…
Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image.
Spring-loaded piston rings