"Jim Carter" writes:


What causes the piston rings to rotate? Since the piston movement is
perpendicular to the cylinder wall, there must be some other mechanism other
than just piston movement causing them to rotate.

Very Clever Design. I can't recall the details, but ISTM there are
[automotive] patents on making 'em creep along.

Also, why would the grooves on the rings have to be lined up to allow
leakage through the groove?

It does leak lots more; the gap between the rings is not all that
far, I guess...

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