320, narrow deck with the funny nuts holding the cylinder on. My compressions have been 72 74. Last year one jug fell to 60. I flew it for a year but figured I better tackle it. Suspected stuck rings. One was stuck. The issue is both rings have a bevel on the inside edge. One bevel was down and one was up. Lots of research and found that car rings can be like that. The bevel puts a twist in the ring during compression and firing. Found a ton of stuff on lycoming site but nothing that addresses the bevel. No little circle marking the up side on the ring. I did find that after torqueing the through bolts to retorque the opposite side thru bolts. Maybe that is why 2 were not real tight. The jugs were bored about 1450 hrs ago with new pistons and rings. Bores look good but they need honing. Please, advice on the bevel. Just does not seem right.
Thanks
will
Thanks
will
