The Shape of Piston‐Ring Grooves: The Importance of the Radius of Curvature at the Base of the Grooves in Resisting High Stresses

THE tendency towards increased engine performance combined with the lowest possible constructional weight has resulted in the stresses on pistons being carried to the extreme limits of fatigue strength. Further, it has always been the aim to raise the limits of fatigue strength as far as possible. These problems may be approached from the materials aspect, but, by improvement in production methods (i.e. from the workshop side), much advantage may be derived from the materials available while continuing to use present designs.