A ring on a piston sealing the gap between the piston and the cylinder wall.
Example sentencesExamples
- 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.
- 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.
- There were also many piston and piston ring failures.