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

  1. #1

    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?

  2. #2
    Senior Member RACING JUNKIE
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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
    ***IN GOD WE TRUST***

  3. #3
    Member JUNIOR BUILDER
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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
    CDR Performance
    The Custom Engine Shop and Sponsor of the First Annual YellowBullet.Com Nats

    If you have never experienced fear your car isn't fast enough.

  4. #4
    Senior Member RACING JUNKIE
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    Quote 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.

  5. #5
    Member JUNIOR BUILDER
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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
    CDR Performance
    The Custom Engine Shop and Sponsor of the First Annual YellowBullet.Com Nats

    If you have never experienced fear your car isn't fast enough.

  6. #6
    Senior Member RACING JUNKIE
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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
    ***IN GOD WE TRUST***

  7. #7

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  8. #8
    Senior Member RACING JUNKIE
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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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