Barrel-faced
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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