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So, A piston ring is a metallic split ring that is attached to the outer diameter of a piston. Consequently, Rings usually come in a set of three different rings in a set. As a result, Most of the time you will have two compression rings and one oil ring.
The main functions of a piston ring are:
- To seal the combustion chamber so that there is minimal loss of gases to the crankcase.
- Improve heat transfer from the piston to the cylinder wall.
- Maintain the proper quantity of the oil between the piston and the cylinder wall
- Regulate engine oil consumption by scraping the oil from the cylinder walls back into the oil pan.
So, During the compression and power strokes, the compression rings seal the combustion gases and prevents blow-by. As a result, Blow-by stays at an acceptable limit.
Engine oil lubricates the cylinder walls. The oil comes from throw off by. the connecting rod bearings. The piston rings wipe off any excess oil.
Consequently, Leaving a fine layer of oil on the cylinder wall to provide lubrication for the following ring. Finally, As rings wear, the ability to perform these functions is decreased resulting in oil consumption and blow-by.
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