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Thread: octane?

  1. #1

    octane?

    I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.

  2. #2
    Senior Member DYNO OPERATOR
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    VP RACING FUEL TOLD ME 110 ON MY 11.30COMP. SBC

  3. #3
    Senior Member RACING JUNKIE
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    IU think hammertime posted this last yr sometime, since he is a VP dealer.

    Zip.

    Here is a rough recomendation. I have left out the lead count, the aromatic hydrocarbon content and specific gravity. There is also a difference in burning speed, energy value and cooling effect.
    PM me if you want it all.

    105 octane, CR under 12.5 to 1
    108 octane, CR under 14.0 to 1 (75% of all racing engines)
    114 octane, high CR and 8500+ rpm (comp cars)
    116 octane, high CR and high RPM (ProStock, comp eliminator)
    117 octane, Turbo and blown applications

    Dave

  4. #4
    Senior Member RACING JUNKIE
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    Re: octane?

    Quote Originally Posted by mmphillips
    I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.
    I ran a 50/50 mixture of 110 and 93 pump gas in a 11.5-1 396 with no problems.

    I believe straight 110 is a bit overkill for a 11.5-1 motor, that's what I run in my 13-1 496.

    JMO<Cp
    ***IN GOD WE TRUST***

  5. #5
    Junior Member APPRENTICE
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    Vp red mixed 50/50 pump will work on 11-1comp. mix the 110 50/50 no less than 60/40 and you will be fine. keep total timing to 36* max.

  6. #6
    Senior Member DYNO OPERATOR
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    Re: octane?

    Quote Originally Posted by cepx111
    Quote Originally Posted by mmphillips
    I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.
    I ran a 50/50 mixture of 110 and 93 pump gas in a 11.5-1 396 with no problems.

    I believe straight 110 is a bit overkill for a 11.5-1 motor, that's what I run in my 13-1 496.

    JMO<Cp
    Ran the same 50/50 mix in my 11.5 383. I beleive with aluminum heads you may be able to cheat that down a little more and save a few bucks on fuel...

  7. #7
    Senior Member SENIOR BUILDER
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    I built a 11.5: 355 for my 70 Chevy 4X back in 1988, it was my daily driver for 8 years on nothing but 89 octane and 104 booster with 35* total timing. The same engine is still in the truck today, it's tired and only sees action once a month but on days I need to get two cars out to the track I can still drag the open trailer with it.

  8. #8
    Senior Member MASTER BUILDER
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    I ran 105 Octane Avgas in my 11.5:1 Camaro. 496ci with nitrous. No probs.
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!


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