A piston ring is a split ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine.
The three main functions of piston rings in reciprocating engines are :
- Sealing the combustion chamber so that there is no transfer of gases from the combustion chamber to the crank.
- Supporting heat transfer from the piston to the cylinder wall.
- Regulating engine oil consumption.
The gap in the piston ring compresses to a few thousandths of an inch when inside the cylinder bore.
Read more about Piston Ring: History, Automotive, Wear Due To Ring Load On The Bore, Fitting New Piston Rings
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