Piston rings really do not care what piston or what motor the go into. They care about ring grove width as in 1/16 of an inch and the ring manufactures advise about .004 Of an inch FOR EACH inch of piston diameter as a minimum and more for a maximum. The website of the piston rings you choose will tell you.

What kind of gas are you thinking of running in your engine? Pete

Mr Gates did it again. Damm

To add to what Pete has mentioned, you’ll need to verify exactly which ring widths are required in your pistons.  Many of the older Jahns pistons used the original ring widths of 5/64, 3/32, & 3/16.  But it’s entirely possible that your set of pistons is different than this.  Once you’ve determined this, then either going through the ring selections in the catalogues or getting with the ring manufacturers themselves can get you a set of rings.

Rule of thumb for ring end gaps is 0.004” per inch of bore for the top ring and 0.003” per inch of bore for the second ring.  Maintain at least 0.015” gaps on the oil ring rails.  Boosted or nitrous applications will require more gap.

So how much more ring end gap is needed for a supercharged motor?

Thanks,

Rono