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Thread: octane

  1. #1

    octane

    I want to put a 12:1 compression sbc in my street car. I want to know what octane fuel do i have to run to keep this engine happy. I will only be cruisein around time sometime and hittin the track some weekends. what level race gas should i mix with the 93?

  2. #2
    Administrator RACING JUNKIE bjuice's Avatar
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    i would say 110purple to be safe..but i have seen 110 (purple) and 93 pump mixed run fine on a 12:1...its not for me thou

    i personally would not go not lower than 110 purple...
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  3. #3
    Senior Member MASTER BUILDER
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    methanol rules [with 10% yellow stuff]
    to finish first: first you have to finish!

  4. #4
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    Avgas.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  5. #5
    Senior Member MASTER BUILDER
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    for cruising i used to run avgas but add a can of marvel oil because the avgas is so dry.

  6. #6
    If you are running aluminum heads, E85!!!! Runs cooler and is a whopping $2.09 at the pump.

  7. #7
    Senior Member EXPERT BUILDER
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    10 percent ethenol gasoline in milwaukee wi where im near is 1.99 a gallon.the good 93 octane pure gasoline is about 2.40.....e85 may be fine for some.but hard to find everywhere...

  8. #8
    Senior Member DYNO OPERATOR
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    YOU CAN RUN E85 IN A 12 TO 1 COMPRESSION MOTOR?

  9. #9
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by JEFF69Z28
    YOU CAN RUN E85 IN A 12 TO 1 COMPRESSION MOTOR?
    There i a guy at a local track that runs 13.1 in his altered on E85.

  10. #10
    Senior Member EXPERT BUILDER
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    if you decide to run that realize you will want to send it in to a good carb shop and have them set it up for ethenol.at least do loooooots of research if you mod your own carb.also might want to also re evaluate rest of your fuel delivery system- do your homework!

    ive heard alcohol is harder on metal than gas is,so ive heard,dunno...supposed to be more caustic,corrosive or however you want to describe breaking down of metal...maybe wives tale,dunno....


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