whats the highest comp i can run with mixing av and 93 50-50

Old 06-27-2007, 11:12 AM
  #1  
badbug3
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Default whats the highest comp i can run with mixing av and 93 50-50

bbc, 572, currently at 9.7-1 comp on pump gas, aluminum heads, marine application.

Looking to make more power by raising the comp , but dont want to buy race fuel. Av gas 100-low lead, is readily available and i heard it makes a really good fuel when mixed 50-50 with 93 octane. What is highest comp ratio i could run with this mix?
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Old 07-03-2007, 10:28 PM
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cepx111
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I would'nt go over 12 to 1.
I ran a 12.5 to one comp in my old racecar using a half and half mixture of racefuel (110 sunoco) and 93 pump gas, ran it that way for 4 years no trouble.
Goodluck, Charles
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Old 07-11-2007, 05:46 AM
  #3  
Robert1320
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AV gas is poo!

It was created for fixed rpm at altitude. I have seen lots of motors damaged by trying to run AV fuel.

IMHO
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Old 07-11-2007, 06:01 AM
  #4  
chevguy65
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Originally Posted by Robert1320
AV gas is poo!

It was created for fixed rpm at altitude. I have seen lots of motors damaged by trying to run AV fuel.

IMHO
I have seen quite the opposite.

I ran it for years in my 69 chevelle, 12.5:1 as well as know many guys that did and still do run av gas.
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Old 07-11-2007, 11:09 AM
  #5  
Robert1320
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I would never suggest it to anyone I built motor for or race with.
I would stick to a brand name racing fuel company.

IHMO
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Old 07-12-2007, 09:48 PM
  #6  
cepx111
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I know several people who run av gas in high compression motors with no problems, but they use top lube with it as its kinda dry if you know what I mean. However I wouldn't recomend using it as a mixer with unleaded fuel in anything higher than 11 to 1.
Goodluck, Charles
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Old 09-19-2007, 06:00 AM
  #7  
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Old 09-21-2007, 07:24 PM
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Down here in redneck country, we run avgas with some motors up to 12 to 1 and some street blower motors. we just throw in a can of marvel mystery oil per 20 gals of gal. No issues and cheaper than top oil lube. we also wipe/spray down the headers with marvel mystery oil with a mix of oil paint thinner 75% thinner and 25% marvel oil. The headers still look brand new after 2 full seasons on a sprinter, black and shiney, and they never rust.

Zip.
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