blsnelling
Friend of the Riff Raff
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One vs two regular rings makes almost no difference at all on compression. I always run a single ring piston when I have the option. I wouldn't run an FCast ring in either scenario. IMHO, all they do is rob power through friction.Generally I try to use the fcast on single ring and regular on doubles, though double thin rings I'll go either way.
Nothing definitive, just seems like it would make sense...