Piston Rings?

[Aussie_Man]

I was just wonderng if or why dont these nitro engines run piston rings? I used to fly planes and almost all the engines in those .15-any size you want (sometimes 2cubic inch a a 5foot plane) had rings. Why dont these engines have em?

[willydogg6]

I was wondering the same thing, did those plane engines run more efficiant, with the rings on it?

[rc10gt_bb]

The scale of the engine to power ratio would just blow out the rings!

[pp13b]

i agree too they just wouldnt handle the rpm...

[Joe B]

Model airplane engines run at lower RPMs than car engines (and run less nitro and less HP per cu/inch). Same with DF engines who run high rpm/high hp ratios. The rings are nice and do reduce friction, replaceable, etc. but they wear faster at these high RPM's. Perhaps it CAN and HAS been done, but I don't really think it would make for a long lasting motor.

- Joe

[gubbs3]

I think the main reason they don't have piston rings in our engines is that they would have to be restricted some how to prevent the separated parts from crossing one of the ports. Most airplane engines that have rings are 4-stroke too. Also my friend who races dirt bikes has problems of the rings breaking. This problem would be multiplied greatly as our engines are so small and run at such high RPM.