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 ...

But when done right, piston rings can create a power advantage by maximizing dynamic engine compression while still maintaining good oil control. This involves both proper selection for the intended ...

A new technique termed the "fixed sleeve" method has been developed to measure the instantaneous friction of the piston and ring assembly as a function of crank angle. This method is a derivative of ...