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Piston ring
Part of a reciprocating engine / From Wikipedia, the free encyclopedia
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A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/12/47mm_piston_rings.jpg/640px-47mm_piston_rings.jpg)
The main functions of piston rings in engines are:
- Sealing the combustion chamber so that there is minimal loss of gases to the crank case.
- Improving heat transfer from the piston to the cylinder wall.
- Maintaining the proper quantity of the oil between the piston and the cylinder wall
- Regulating engine oil consumption by scraping oil from the cylinder walls back to the sump.[1]