What is Compression ring? - Automotive dictionary and encyklopedia - all about cars, motorcycles, engines etc.

Automotive dictionary (encyklopedia)

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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 help to transfer heat from the piston into the cylinder walls and subsequently to the water jacket surrounding the cylinder.
See also grooved compression ring, stepped compression ring, tapered compression ring