Abstract
The range of piston ring materials currently available to the designer is given, showing their relative importance in durability and fatigue. Ring wall pressures for given duties illustrate the wide variations that exist. The piston ring free shape and its association with the ratings of diesel power units highlight the need for a better understanding of thermal gradients in ring section. Surface coatings and their relative merits to ring wear, scuff, and liner wear are illustrated. Oil control and blow-by characteristics from break-in to stable operation are discussed. Piston ring groove temperatures coupled with cylinder liner wall temperatures adjacent to the top ring location need early appraisal in design and development. Control of surface finish for both cylinder liner and piston ring is important for the critical break-in period. Control of quality is outlined.
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