Capt'n, Volfy, RCIGN1 -

Thanks all for your replies, and yes, my current question IS about a two-ring engine. I'm aware of the rounded-ring the single-ring engine had and why replacing it with one of Frank's rings makes a significant difference in compression. I haven't had my hands on a twin-ring version so far, so I don't know if they use the same rounded-rings as the single-ring version. My question then is, when I get my twin-ring engine, should I replace both rings with better ones from Frank, or should I just replace one (the top one I presume) and let the other ring grove handle some extra oil as suggested by captinjohn?

I've been monitoring these engine forums for some time now and have seen all three of you fellas appear quite a bit, and would just like to thank all of you for the time it takes to help the rest of us out. This is what makes the hobby enjoyable! Dennis