Why do we need piston rings?

The pistons in an engine block must be sealed inside each cylinder in order for the process to be efficient. Because the pistons travel through the stroke millions of times throughout the life of the engine, the seals are critical. read more

3 piston rings are used in 4 stroke engines & 2 in 2 stroke rings. There are 2 compression rings and one oil control ring in 4 stroke engines. Use of piston rings: 1. preventing transfer of compressing mixture in to crankcase 2 support in heat transfer to cylinder walls 3. helps in lubrication of cylinder walls also. read more

If we do not use piston rings, we have to make extremely accurate cylinders and pistons, plus that combo wont be able 2 scrape off excessive engine oil left on the cylinder wall. read more

The gap in the piston ring compresses to a few thousandths of an inch when inside the cylinder bore. Piston rings are a major factor in identifying if an engine is two stroke or four stroke. Three piston rings suggest that it is a four stroke engine while two piston rings suggest that it is a two stroke engine. read more