Hypereutectics pistons and alcohol

Old 12-01-2011, 07:52 AM
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RangerDeacon
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Default Hypereutectics pistons and alcohol

Considering some KB hypers (64cc heads) for a production SBC 406 Alky setup. Plan is to run N/A alky 13:1 ratio 500-600hp with a rotating assembly rated for 650hp max. DRAG Car.
Its my first engine and after some research and deliberation I want to try alky over pump gas/NOS. Anyways, I really haven't found anything that warns against hypers & alky. I know hypers are not a good idea for NOS, supercharging etc. I've read plenty on the differences of hypers: harder and more brittle, less expansion, tighter clearances and timing.

Does anyone have any experience/knowledge on using alky with hyper pistons?
good, bad or ugly...

tks
James
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Old 12-01-2011, 09:39 AM
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zipper06
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Not a good plan with alcohol, i know some guys that run a 305 sprint car were the rules mandate stock type piston and heads on alcohol, the biggest problem with them is you have to run atleast a .030 ring gap on the top ring, or you'll pull the top off due to the heat, and that much end gap causes the clyinders to wash down on warm up, and milk the oil pretty bad. It's not easy or cheap to build a good reliable engine to run alcohol. It's kinda like throwing a 200 shot of nitrous on a bone stock, engine, you can do it but for how long :?:

JMO

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Old 12-01-2011, 11:06 AM
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RangerDeacon
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Originally Posted by zipper06
Not a good plan with alcohol, i know some guys that run a 305 sprint car were the rules mandate stock type piston and heads on alcohol, the biggest problem with them is you have to run atleast a .030 ring gap on the top ring, or you'll pull the top off due to the heat, and that much end gap causes the clyinders to wash down on warm up, and milk the oil pretty bad. It's not easy or cheap to build a good reliable engine to run alcohol. It's kinda like throwing a 200 shot of nitrous on a bone stock, engine, you can do it but for how long :?:

JMO

Zip.
Milky oil...I remember coming across that in a forum somewhere early in my research. If I recall it correctly, there was talk about hitting the intake with something to get it going on cold starts and pulling the the fuel cutoff half-way out, up to the water box and after the line. I do realize that there's more pre and post maintenance care with running alcohol. Need to check into that issue....tks zip
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Old 12-01-2011, 11:35 AM
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curtisreed
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Check these pistons out. Good prices for a 2618 forged piston. I have a set from when they were sold under the Keith Black name in my motor now. Very nice piston for the price. I got lucky and ordered mine from Summit not knowing that they had the wrong price in only for the piston I needed at the time. Paid 275.00 for set of 8. Had I looked at any other sizes on the sight at the time I would have seen I saved a couple hundred dollars and I might have ordered a couple more sets.

http://www.summitracing.com/search/Brand/ICON-Performance-Pistons/Make/CHEVROLET/Part-Type/Pistons/Bore-in/4-155-in/?Ns=Rank|Asc

Here is the web site.

http://www.kb-silvolite.com/icon/index.html

Curtis
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Old 12-02-2011, 06:12 AM
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cncmotorsports
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Buy a good set of forged pistons, if money is a concern, Icon Makes a great forged piston for a pretty attractive price. The hyperuteitc are prone to cracking the ring lands as they are very brittle. Wider ring end gaps are required.
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Old 12-05-2011, 06:40 AM
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RangerDeacon
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Thanks all

James
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