Though the job of piston rings is obvious—cylinder sealing and oil control—another equally important function is carrying heat from the piston to the cylinder wall via direct contact.

Rings Piston rings perform a number of important functions. They seal the gap between the piston and cylinder wall to prevent combustion gases from blowing by into the crankcase.

The causes of piston-ring wear are analyzed and classified under three headings — abrasion, corrosion, and erosion. Various types of coating materials, both metallic and non-metallic, employed to ...