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Discussion Starter #1
Hi guys, i know there are ALOT of different opinions out there on almost every aspect of a race motor, but i posted a question in NA section about it and got a wide variable on it.
Heres the question:
Building a 400 SBC (factory block) will finish at 406ci
4.155 bore
3.750 forged crank
12.4 to 1 SRP
Brodix Track 1 light port work 221 runners 67cc's
Dart manifold gasket matched
665 lift Soild Roller 274 @50
Decided on .020 to .025 on the bearings and asked what a bracket motor 6500 rpm approx 570hp would be a good ring gap
I'm thinking 20 top ring 22 to 24 2nd ring, anyone run a combo like this that works well and what gaps are you running, some answers were 20 top and 30 or more 2nd ring. Thanks
 

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Montgomery Ragland
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3,016 Posts
With the standard bore x .05 would land you around .20. then say + .06 for the second would put you @ well.. .26.

I'm no expert by any means, but there is power to be had in keeping the rings tight, but too tight, they will butt and game over. If anything I would run say .21-.22 and .25 - .26 for a touch on the safe side, and be more so concerned with actual ring seal.

Somebody smarter should hopefully be along with better info.
 

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This amp goes to 11.
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No real guru here, but two questions, for starters...

1) What rings do you intend to run?

2) How often do you plan to tear it down?
 

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Discussion Starter #7
JE Moly Rings

NO Spray

Ok add the 0 .0025

Hope to last the season before tear down, about 15 races total
 

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This amp goes to 11.
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Not sure who does JE's rings anymore, I think it used to be Sealed Power/Speed Pro. I take it they aren't anything out of the ordinary, just 1/16"-1/16" & the oil ring assembly?

My personal take on this would be the same as Montgomery's...then at teardown, check the ring ends for checkmarks; and if all is good, try tightening them up by .001. Baby steps. This is a pretty basic combo, really, and as long as you keep the tune & fuel type reasonably sane you shouldn't have to worry.
 
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