Piston Ring question

[renos-a10]

Hello guys.
I am thinking if the piston rings have a rotation?

Thanks
Renos

[LJ.]

Hi Renos... I think when the piston rings are new and fitted to a rebored cylinder they must surely rotate to some extent until they find a place to rest and then bed in. When ever I have fitted rings they are always in a different place when cylinder is removed. I usually put the oil scraper ring join at the back of engine 6'o'clock, then middle one at 2'o'clock position and top ring at 10'o'clock. I would not think that the rings are rotation constantly, I maybe wrong though... Interesting question!

[A10Boy]

If my memory serves me right, I was taught that when building an engine the top ring is positioned so that it's gap is farthest away from the exhaust vale. The other rings are spaced out equidistantly ? equally spaced. I never imagined that they would move much, but I suppose they must do a bit.

[renos-a10]

Thanks guys! apriciate for our help

[BSA_54A10]

Yep, they go round and round and round.
This is why strokers have pegs in the groves, to stop the gap fouling on the ports