ring gap for 250 shot

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Apr 22, 2009 | 03:38 PM

02anti_vnm

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From: Roanoke, Va

ring gap for 250 shot

I'm putting my forged 347 back together and I'm ready to gap the rings and just need a little double checking

The pistons and rings are both made by mahle they're flat tops with valve reliefs
I'm going to be spraying a 250 direct port on it and I called mahle and the man said I should gap the top one at .030 and the second one at .023 does that sound about right? I trust the guy just wana make sure

Thanks for any help

Apr 22, 2009 | 06:05 PM

WE TODD DID

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Quote:

Originally Posted by 02anti_vnm

I'm assuming its a 4" bore? If so, .030 is good on the top ring, but the bottom ring need to be gapped larger than the first.

Apr 23, 2009 | 10:21 AM

02anti_vnm

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Apr 23, 2009 | 11:20 AM

02anti_vnm

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Its a 3.9 bore but y does the bottom ring need more gap I'm new to building an engine and new to nitrous. I'm just learning as I go

Apr 23, 2009 | 05:25 PM

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If the second ring gap is smaller, it can result in getting gasses stuck between the rings. The engine will actually make a little more power with a larger second ring gap. I do mine about double of what the top ring gap is, but really anything larger than the top will be fine.

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