Rich plugs

Discussion in 'Engine Topic' started by rhino370, Jan 31, 2021.

  1. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Not questioning your post on which plugs are fouling, but that is an odd order for a SBC. Here's a diagram just to verify.

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  2. rhino370

    rhino370 Veteran Member

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    It's not a small block it's a 454
     
  3. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Firing order and cylinder numbering still the same.
     
  4. rhino370

    rhino370 Veteran Member

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    Yes
     
  5. rhino370

    rhino370 Veteran Member

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  6. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    Rhino - no one asked. How do you know the front cylinders are rich? Are you reading the plugs? If so, post up some pictures of them here. There are a few guys who are very good at reading subtleties

    The RPM drop when the fans engage may be an indicator here. I'm wondering if the ignition system isn't getting enough power to properly fire the spark in the cooler cylinders. What are you running for an ignition system now? If you are running an MSD-style box, is it grounded directly to the battery?
     
  7. rhino370

    rhino370 Veteran Member

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    It's a dui ignition, powered off the battery by relay switch. Will post some pics this weekend
     
  8. John Wright

    John Wright Veteran Member Lifetime Gold Member

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    Interesting thread.
     
    sandlapper likes this.
  9. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    OK - so a DUI is basically an HEI, it doesn't have crazy power demands.
    Still - this feels like a power/ignition issue. Nothing about turning on electric fans should cause an engine to drop RPM.
    Are you running an electric fuel pump?
     
  10. Cardinal

    Cardinal Veteran Member Lifetime Gold Member

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    What carburetor? If an Edelbrock, set the float height and drop. They are NOTORIOUS for being WRONG out of the box!
     

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