Yeah ,gapless rings can reduce compression leakdown to less than 2%. But not all engine builders are thrilled with gapless rings.Some say outside of special racing needs ,they aren't necessary, they have problems in some applications and they are quite expensive.But I have no experience with them so........
I also hear that Deves rings are very good,made of steel rather than cast iron or cast coated with moly or chrome.
It's no secret that hi output Japanese engines maintain excellent cylinder sealing for 200K miles and beyond, what rings do they use?
