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Re: Need help with piston ring gaps... Posted by 900 Aero [Email]  (#425) [Profile/Gallery]
(more from 900 Aero) on Tue, 19 Aug 2008 21:52:10
In Reply to: Need help with piston ring gaps..., a12, Tue, 19 Aug 2008 15:34:40 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Ring end gap can be more than stock spec's as long as it's not way over spec. In other words 021-.022" isn't really too much especially for a turbo application! Also your cylinder is probably a tiny bit smaller further down the bore which would of course lessen the end gap when the piston is in that area. The important thing is that the second ring has to have at least the same or preferably more end gap than the top ring otherwise pressure will be trapped between the 1st and 2nd rings causing them to flutter and therefore not seal as well as they could. Keith Black designed pistons that have a chamber machined in between the two so what pressure does get past the top ring will have a place to expand into. There are ring manufacturers that know this so they intentionally package their rings with the second one having more end gap. Make sure your rings have a ductile (high strength) top ring, you can tell by squeezing it's end gap together and them comparing it to the feel of the second ring. In other words the top ring should be way harder to squeeze together than the send ring. What brand of rings are yours, it's nice to companies making the end gaps come out right, you lucked out! Dave
posted by 204.16.14...
, Wed, 20 Aug 2008 22:34:54, Tue, 19 Aug 2008 21:52:10 <-- Viewing This Message, Tue, 19 Aug 2008 23:11:45, Wed, 20 Aug 2008 07:35:03
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