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Piston Ring

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Neil Wyatt	16/03/2017 08:50:17
19226 forum posts 749 photos 86 articles	The piston ring has to make sufficient seal to allow gas pressure to build up behind it in the first place.
Andrew Johnston	16/03/2017 14:09:18
7061 forum posts 719 photos	Posted by Andrew Tinsley on 10/03/2017 18:43:07: Dykes rings on the other hand ARE designed to expand under pressure, They are L shaped and have been used from time to time in model aircraft engines. They show almost zero compression when flicked by hand. The whole point of the Dykes ring is not that it was designed to expand under pressure and other types were not; but that it maintained the seal at much higher piston speeds than ordinary rings. Thus it reduced the problem of ring flutter that was occuring in high power, high speed, aero engines in the interwar years. Andrew
Howard Lewis	17/03/2017 07:28:00
7227 forum posts 21 photos	Having spent my working life (starting as an Apprentice in 1958) developing and trouble shooting diesel engines, be assured that piston rings ARE designed to be gas backed. Running on light loads, friction is reduced, and quite often blowby can increase, but on full load the ring makes a better seal. Blowby can also be affected by ring gap. The smallest gap that is acceptable, and workable is the one which JUST prevents the ends of the ring butting together. If the ends butt at full load conditions, the ring will break, often resulting in damage to the bore and the piston. Howard

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