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Thread: motor poping

  1. #1
    Junior Member JOURNEYMAN
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    Jul 2004
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    motor poping

    can some one help me mind my easy fix. i have inquird a poping noise at high rpm. i thought i might have water in fuel but carb,fuel pump and filter was clean. iam think that if it was a bad valve spring it would do it threw out rpm.? right or wrong? any way to test msd box? it a big block chev

  2. #2
    Administrator RACING JUNKIE
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    What MSD Ignition box you got? How high rpm are you talking about?
    There Is 1 Thing Better Than Cubic Inches,,,More Of Them

  3. #3
    Junior Member JOURNEYMAN
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    msd 7al well some where around 6000 and up i have a 7000 pill.in it

  4. #4
    Administrator RACING JUNKIE
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    7AL?? 2 or 3?
    There Is 1 Thing Better Than Cubic Inches,,,More Of Them

  5. #5
    Junior Member JOURNEYMAN
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    my bad it a 2

  6. #6
    Administrator RACING JUNKIE
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    Its possible the 7al2 could be going away,the 7al2 is about the same caliber box as the 6al,which is about half the caliber as a 7al3

    I'd sooner think you was having issues with your box,or the add on box for the rev limiter,maybe unplug the rev limiter and see if the problem goes away,other than that,I'd say either upgrade the box or ship it back to MSD and have it checked out

    Also you could be having tachometer issues causing it to cut out at higher rpm's
    There Is 1 Thing Better Than Cubic Inches,,,More Of Them

  7. #7
    Senior Member EXPERT BUILDER
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    What kind of fuel do you run? I know you said it was clean but i still want to know. Also what compression do you run?

  8. #8
    Senior Member MASTER BUILDER
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    You may want to check your valve springs,also make sure your mag pickup wires are separated from the coil orange and black leads.also check the polarity on the mag pickup.to do this look at where your timing is set,unplug the dist and take two short wires.plug one end into the dist and cross the wires before plugging them into the wire loom.start the engine and see if the timing advanced or retarded.the correct position is the retarded one.Bill
    Hendrens Racing Engines
    1310 U.S. Hwy 221 North
    Rutherfordton N.C. 28139
    828-286-0780 Bill, Steve, Mike
    www.hendrensracingengines.com

  9. #9
    Junior Member JOURNEYMAN
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    vp 110 it 13to1 it just started it last weekend never had a prolbem till then . ithought if it was valve spring it would do it all the time?

  10. #10
    Administrator RACING JUNKIE bjuice's Avatar
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    i have to ask..what did you run before then ?...(fuel)

    thanks brian
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "


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