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Old 07-06-2020, 03:25 PM   #10
frnkeore
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Join Date: Jul 2019
Location: Southern Oregon
Posts: 782
Default Re: 255 merc excessive ring end-gap?

Yes, I have read that too and that is come about in the last few years. What I read wasn't fully explained. If you can cite, the exact explanation, I would like to read it.

It may be so but, the top ring does get hotter than the second ring so, I still do it this way. I used to make the second ring about .002 less than the top but, after reading that, I make them the same, just in case. In this case, if you have the factory spec of .014/.016, you'll be just fine.

I've bought a set of gapless, second rings, to try out. They have over lapping ends, that would seem to keep any gases from the top ring going past the second and plenty of room to expand.
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