Quote:
Originally Posted by Woodz428
there was a 2 post exchange on the first page and after reading all the posts it was never revisted, I am interested. Do rings rotate on the piston or not?. I have always worked under the impression that if they do it is minimal, for 2 reasons 1) it would create more wear in the piston/cylinder wall and after pulling hundreds of engines down the wear is usually relgated to the top groove/cylinder and attributed to the heat/ring tension 2) the crosshatch used to seat the rings would act to prevent/restrict rotation. So which is it?? Usually the sticking is the ring sticking in the groove and not expanding on to the wall correctly.
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Yes, rings do rotate on the piston.......how much, I'm not sure, but I've seen it in a few motors I've built and later gone thru to freshen them up. some motors more than others, I have no idea why, they were all built by me the same way........
I've often wondered why automotive pistons are not made similar to outboard motor pistons, with a "pin" in the ring groove so the rings can't rotate.........
David