Piston ring meaning

Piston ring definition

A metal, split ring installed in the groove on the outside wall of the piston . The ring contacts the sides of the ring groove and also rubs against the cylinder wall thus sealing the space between the piston and the wall. Poor rings can cause poor compression and severe blowby . Often seen as blue smoke out the exhaust pipe . See compression ring , dykes ring , and oil control ring .

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Automotive terms beginning with "P", page 14

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