Piston ring spacing

[Mart]

Thanks for all the ring tech, guys, a lot more to it than I'd ever dreamt. I don't build a lot of engines, but do set the gaps apart when I do. It's no hardship, I'll keep on doing it, whether it's necessary or not.

Mart.

 

[Ol' Ron]

Very interesting

 

[cmbrucew]

I seem to remember motorcycle pistons having holes for pins to locate the rings.
I believe they were an off shore make bike.
Bruce

Works good
Lasts long time

 

[Ross in East Texas]

Many large industrial 2 cycle engines (10"-12" bore or larger) have doweled piston rings to prevent the rings from rotating. This keeps the ring end gaps passing over the webs between the ports to prevent ring clipping and port wear.

 

[Ronnie]

Many specific sets are done this way to prevent rotation.Referred to as pin mill rings.