One of the mysteries of the English language finally explained.
A ring on a piston sealing the gap between the piston and the cylinder wall.
- ‘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.’
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