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- Random leak testing is also recommended because any cylinder leakage indicates a bent valve or a faulty piston ring.
- The downside is that tiny amounts of oil can force their way up past the piston ring into the combustion chamber.
- All piston rings rely on cylinder pressure for sealing; gas ports just apply the pressure more efficiently.
- Something was broken and Bill and I suspected he'd blown a piston ring.
- There were also many piston and piston ring failures.