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Thread: c12 in 9:1 CR SBC

  1. #1
    Senior Member SENIOR BUILDER
    Join Date
    Dec 2005

    c12 in 9:1 CR SBC

    is there any reason to use c12 in a low compression engine. any benefits, any HP increase? may run cooler if properly jetted? would a dyno show any power increase?


  2. #2
    If you don't need it don't run it . The higher octane is to stop detonation and at 9to1 you want have that problem

  3. #3
    Administrator RACING JUNKIE bjuice's Avatar
    Join Date
    Apr 2003
    Greenville s.c.
    James is exactly can over fuel a motor...meaning that too much octane can acutally slow one down...octane is used to gaurd against detonation purposes only..



  4. #4
    Senior Member SENIOR BUILDER
    Join Date
    Dec 2005
    thanks for the responses guys. that's exactly what i was thinking. i have never found giving an engine more octane than it requires to be useful. the reason i asked is i have a friend that races circle track and he insists he needs c12. i tell him he is wasting his time and money. oh well.......

  5. #5
    Senior Member DYNO TECH
    Join Date
    Feb 2004
    Leonard, Texas
    One of the most common misconceptions about octane I come across, is people think the higher the octane the more flamable or powerful the fuel is. In reality, the higher octane actually raises the flash point, meaning higher temps are required to ignite the fuel. This is why it makes more power because it allows the engine to squeeze it more before igniting it causing a bigger bang. A low compression engine may have difficulty generating enough cylinder temp (which cylinder pressure is partialy responsible for), to completely burn the fuel, consequently reducing engine efficency.

    So what they said about no benefits to it in a low compression engine!

  6. #6
    Senior Member DYNO OPERATOR
    Join Date
    Feb 2006
    VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
    A dyno should show a power loss.

    If this is a street engine it should work fine on 87 octane pump gas. Maybe 89 at the most. If itr won't it is maybe a non-quench engine and will require the extra RON/MON of the 92-93 octane.

    " Let all things that hath breath, praise the Lord. Praise Ye the Lord" Psalms 150 vs 6.

  7. #7
    Join Date
    Jun 2006
    The Custom Engine Shop, Indianapolis, Indiana
    Ed is correct. We have put in the RaceGas and lost power.
    Use enough octane but not crazy amounts, it hurts not helps.
    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.

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