- The top rings used on reciprocating engines’ pistons. They seal the cylinder, so that an upward-moving piston can compress the air into the cylinder. Compression rings also transfer heat from the piston to the cylinder wall.
Aviation dictionary. 2014.
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compression ring — A ring which surrounds the piston and fits in a grove in the piston. It is designed to seal the burning fuel charge above the piston. Generally there are two compression rings per piston and they are located in the two top ring grooves. They also … Dictionary of automotive terms
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compression gauge —  A gauge used to test the compression in the cylinders. A poor compression reading can indicate that there is leakage through the valves or the piston rings. In two stroke engines, it could indicate that there is poor primary compression… … Dictionary of automotive terms
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