Barrel-faced is one of the compression ring types that makes full contact with the cylinder wall to prevent gas leaks and compression leaks, as well as prevent oil loss through piston.
On the combustion and compression strokes, the pressure of the combustion gas and the compression pressure are applied to the back and top surfaces of the ring, in addition to the self-tension of the ring, so that it adheres to the cylinder wall even more firmly.
Additionally, some rings have barrel-faced contact surfaces that make contact with the cylinder wall, make good contact in the initial stage, and prevent abnormal wear and seizing. Mainly used in top rings.

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