Re: Lessons learned on piston ring gaps

Posted by Super-H-Mike on May 23, 2016 at 07:55:59 from (76.164.144.132):

In Reply to: Lessons learned on piston ring gaps posted by David G on May 23, 2016 at 05:53:59:

For all my years setting up motors ,ring gap was always .004 per inch of bore,ex: 4 inch bore = .016 gap. The second ring was usually set up tighter and the thinking was it didn't see as much heat and expanded less . Speed Pro now says to open up the second ring gap to .020-.022 on a 4 inch bore. The thought is it allows gasses that get by the top gap to get out and not be trapped between the rings which causes flutter at high speeds and loads. Supposedly helps the top ring seal and even picks up a bit of power depending on application and conditions of course. I have an old school 327 SBC of my own I am putting together now and am going to try the bigger second gap on it.

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