keith black.. hyperutechtic pistons - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-25-2002, 03:30 PM
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Post keith black.. hyperutechtic pistons

i have a new 406 chevy engine with keith black hyperu..pistons , specs call for .031 ring end gap for this piston/motor combo. 031 is a lot of ring end gap compared to normal forged pistons,has anyone used these and there recomendations for the above combo/ piston mfg, says .0075 per inch bore for ring end gaps with these pistons for drag race motoron gas normaly aspirated. any help appreciated..thanks

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Old 11-25-2002, 03:57 PM
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.018 to .022 sounds better to me. I run these gapes on my current never ending project. Hyper pistons do expand a little more than forged but I don't think thier gonna go that far.
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Old 11-25-2002, 04:10 PM
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I run the same pistons in my 347 stroker and it called for .034 course that was for the use of nitrous as well but it runs great no complaints
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Old 11-25-2002, 04:17 PM
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i say this alot "i dont know crap" but i do know it's the pistons that are expanding not the rings so....
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Old 11-25-2002, 04:23 PM
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Actually rings do expand, and if you've ever seen ones that had butted together because of insufficient end gap you'd know why it is important. If that's what is called for,from the mfg., I'd go by it.
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Old 11-25-2002, 05:08 PM
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Gap them as KB says, Im using the same type in my 427 small block without any problem.
It would be good to polish the top of the pistons for heat travel. Heres the site to tell you about it, plus the info on ring gap from KB.
http://www.kb-silvolite.com/page07.htm
I rememberone of the edits about the top of the piston breaking at the edge of the piston, the small end gap would cause that problem.

[ November 25, 2002: Message edited by: 1BAD80 ]</p>
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Old 11-25-2002, 05:20 PM
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I am putting a 355 sbc together with KB Silvolite pistons. I also questioned the very large top ring gaps they recommend. Their website explains -&gt; The top ring is located VERY high on the piston compared to most designs. The top ring therefore sees a lot more combustion heat and needs the extra clearance so the rings don't butt.

The what the guys are saying is right. Go with KB's recommendation.
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Old 11-25-2002, 05:25 PM
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My local race/machine shop carefully advised me to follow the KB top ring clearance as advised. The top land is thin and expansion will pop it out if you do not have the gap they recommend. I followed the recommendation and they work just fine in my 10.3:1 SBC383.
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Old 11-25-2002, 07:38 PM
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You know what I would do? I would toss the instructions that the factory has given. I mean what the heck do they know anyway. Guys that ask questions like this end up asking what happen to my engine shortly after install, then bad mouth the manufacture. <img src="graemlins/spank.gif" border="0" alt="[spank]" />
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Old 11-25-2002, 08:01 PM
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follow the instructions, i get people in every week all pissed off at keith black or silvolite pistons, always because the top of the piston came off or the ring lands are destroyed, if they had read the instructions and set up the end gap properly they would have had no problems. then they storm out if you tell them it was their own fault the motor didn't last. READ THE INSTRUCTIONS set them up with loose end gaps. The ring takes a lot more heat in these pistons and expands more. if the ring butts off comes the ring land or piston top. and its always somebody elses fault!!!!!
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Old 11-25-2002, 08:01 PM
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[quote]Originally posted by monte3406:
<strong>i have a new 406 chevy engine with keith black hyperu..pistons , specs call for .031 ring end gap for this piston/motor combo. 031 is a lot of ring end gap compared to normal forged pistons,has anyone used these and there recomendations for the above combo/ piston mfg, says .0075 per inch bore for ring end gaps with these pistons for drag race motoron gas normaly aspirated. any help appreciated..thanks</strong><hr></blockquote>

A 406 Chevrolet would have a bore of 4.125 plus .030 = 4.155

.0075 per inch would come out to .031

Do what the instructions say!!
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Old 11-26-2002, 07:44 PM
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Take my word and rodders luck for it... KB hypers need more ring gap!! top of piston goes powie when ring ends butt!
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Old 11-26-2002, 07:57 PM
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I have to say, agianst my previous post, that big is ALWAYS better than not enough. I'd second geuss my self and follow the recomendations.
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Old 11-26-2002, 09:09 PM
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Yep,

what they said.
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Old 11-26-2002, 09:33 PM
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I try to keep one around to show the guys what happens when they don't follow directions. Everyone is so worried about sealing the thing up at no leakdown. If they would follow the directions and then concentrate on the tune up they would be far ahead. Although back when we first started playing with nitrous I butted a few rings together my own self <img src="graemlins/spank.gif" border="0" alt="[spank]" /> .
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