Roush wants my Alum. FE 511 motor

[DAVID GAGNARD]

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.

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