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To prevent fuel, air and combustion gases from escaping. Short and simple.
Compression rings are made of cast iron.
Normal piston have 2 compression rings and a 3 piece oil ring. Some aftermarket rings have a 2 piece zero-zap second compression ring to reduce blow-by.
the sole purpose of compression sports wear is mainly for protection and if it is cold, WARMTH.
There are brass ones and nylon ones.
loss of power
The purpose of chocolate rings is to wear the ring on your finger and eat it until it is all gone. There really isn't a point or purpose of chocolate rings.
2 compression rings and one oil control ( helps scrap excess oil off cylinder walls)
Compression blowby is air, fuel, and exhaust gasses slipping past the piston rings into the crankcase.
You don't repair compression rings you replace them.
If you're getting gasoline in the oil, then you have bad piston rings that are allowing gases into the crankcase. You can find which piston(s) have bad rings by doing a compression test; a cylinder with bad rings will have lower compression.
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