Round Non Polished Brass Rover Piston Ring Set, For Engine, Size : 10inch, 4inch, 6inch, 8inch

The purpose of the piston ring is to prevent the combustion gases from leaking past the piston into the crankcase and to provide a barrier between the oil in the crankcase and the combustion chamber. This is important because it helps to maintain the engine's compression, which is necessary for the engine to operate efficiently.

There are typically three types of piston rings: the compression ring, the oil control ring, and the scraper ring. The compression ring is the top ring and is responsible for sealing the combustion chamber. The oil control ring is located in the middle and controls the amount of oil that reaches the cylinder wall. The scraper ring is the bottom ring and is responsible for scraping excess oil off the cylinder wall.