In a conventional application, there are three rings per piston. The top ring is called the compression ring. Its purpose is to seal the combustion gas pressure, transfer heat from the piston to the ...

If asked what you wanted for piston rings in your engine build, would you know how to answer? Piston rings have the most important job in your engine. We will get arguments on this one because there ...

You might overlook the end gaps of piston rings in your car. They shouldn't be taken so lightly, though, as they actually play a vital role in your engine.

CARS.COM — Vehicles affected by service bulletin: The problem: Under certain operating conditions, the engine in certain Accords may develop deposits on the piston’s oil control rings, which may lead ...

SAE International Journal of Engines, Vol. 9, No. 3 (September 2016), pp. 1807-1824 (18 pages) ABSTRACT The oil control ring (OCR) controls the supply of lubricating oil to the top two rings of the ...