New BBC won't fire???

Discussion in 'High Performance Modifications' started by fast72, Nov 23, 2012.

  1. fast72

    fast72 Veteran Member

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    BBC "509"
    4.500 Bore
    4.000 Stroke
    13.2 to 1 compression
    Comp Roller Cam 726/714 Lift 284/294 @ .050 on a 110 lc
    Rectangular Dart Pro 1' 325CC ported a lil bit
    Rectangular Dart Intake ported to heads
    Hooker Super Comp Headers 2" primary and 3 1/2" collector

    Digital 6 tested good
    SS coil tested good
    billet dist. tested good.

    Motor has spark, but when turning the motor over it sounds like it is retarded...Timing is setup properly??? Brand new rebuild on engine will not fire? Battery shows 12.4 volts and I put on the charger and it shows 12.5 but sounds like it is struggling to turn over...HELP

    Could it possibly be a dead cell in the battery and then when a load is put on it the power output dies?
     
  2. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    .

    If you are sure you have the timing at 36, I would definitely try a new battery before wasting time on anything else.
    Then start in order, cables, connections, starter etc.

    Might even try dual batterys just to see if it makes a difference??

    .
     
  3. SMCZ28

    SMCZ28 Veteran Member

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    Remember fill the gas tank :D lol
     
  4. fast72

    fast72 Veteran Member

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    Got gas and it is not 180 out either.
     
  5. Hoot

    Hoot Veteran Member

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    As stated. make sure battery is good. jump start with another battery maybe.

    Make sure you adjusted the valves properly.
    Good ground to engine and frame.
    firing order correct.
    seems like alot of compression for a normal starter.


    gas, spark and compression is what you need.
     
  6. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

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    Have you checked cell to cell in battery? pull caps, using VOM, check neg post to first cell (put pos lead in acid) should be about 2.0 volts, then work you way down the battery dipping leads in two holes right next to each other, then last will be neg lead in cell and pos lead on pos post. That will show you if you got a dead cell.
     
  7. 1970.5rs

    1970.5rs New Member

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    Firing order correct .?
     
  8. Thunderkyss

    Thunderkyss Veteran Member

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    That's my question. If your engine is turning over fine (13.2 cr...... wow) I don't think you've got a battery issue.

    If it sounds retarded, I imagine a little backfire, a little lag in the rotation, so the ignition system is trying to do what it's supposed to, but may be out of sync.

    If the firing order is correct, I'd pull the front cover off & double check the cam/crank relationship. Make sure you don't have it 180 out.
     
  9. fast72

    fast72 Veteran Member

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    I am going to replace the battery with a known good battery...

    I don't have the means to test the cells etc; in the battery....

    Firing order is 18436572 All looks good there...Even ohm out the wires.
     
  10. markw

    markw Veteran Member

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    Remember a timing light will work while cranking the motor. What kind of starter? Disconnect the ignition and see if it spins over freely.
     

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