Question? Can I put two 1/8 rings in a 1/4 castiron piston groove skipping the second groove then putting the oil ring in the third as usual? The theory being cutting down on drag but still getting two ring seal but in one groove. Does anybody know where I could get 1/8 in. rings the ones for aluminum pistons are too thick their ring grooves are deeper than the castiron pistons.

Hi, Rick. I have used two rings per groove on several flywheel engines that had less than perfect cylinders. The two rings with their grooves placed opposite will give the effect of a gapless ring. On one occasion I had to refresh the grooves on a piston and ended up with 5/16" grooves. I couldn't find 5/32" rings and installed one 3/16" and one 1/8" in each groove. Worked fine. About the only difference I can see with your application is that the T Model opperates at higher speeds than flywheelers but I don't see how that could be a problem.

Starbolt Engine Supplys would probably have the rings you need. Phone, 301 874-2821. E-mail, starbolt4u@aol.com . Web address, www.starboltenginesupplys.com .

They're gonna be kinda pricey so this might be a good time to think about oversized cylinders and aluminum pistons. Just a thought.

Hope this helps. Good luck. Bob

Per above I should have said "The two rings with their GAPS placed opposite, etc." Poof reed, peef rood, prof weed. Bob

Oh, yeah, you probably shouldn't skip the second groove. I'll shut up now. Bob

No reason why not, poms have built motors with multiple rings in one grove, especially diesels to get the mac's in compression, cord rings they were called and could get as thin as maybe 15/20thou but buy that time when that thin they were mad from spring steel not cast.