Which ignition coil can handle constant 12V: UPDATE - car running

Electrical & Ignition

  1. Canadian1968

    Canadian1968 Well-Known Member

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    I am playing around with the idea of the HEI ignition module swap inside one of our original orange boxes. Done a lot of reading it seems pretty straight forward. The biggest thing i have read, in order to take full advantage of this swap you need a coil that can handle a constant 12v. Unlike most coils that require the ballast resistor on our fire wall to drop working voltage to 8-9v range.

    I know most of the articles say to use an E-coil, but I am trying to keep it looking stock with a canister style coil. Wondering if anyone has found a coil that can handle the extra juice.??
     
  2. HALIFAXHOPS

    HALIFAXHOPS MSGT(ret) and MOPAR only distributor rebuilder! FBBO Gold Member

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    Look for one that has internall resistance of 1.5 ohms, petronix make one.
     
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    • threewood

      threewood FBBO Gold Member FBBO Gold Member

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      Pertronix Flame-Thrower coil.
       
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      • AR67GTX

        AR67GTX Well-Known Member

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        I thought the ballast resister was to protect the points from burning, not so much the coil? But in any event, a coil from any electronic ignition company whose instructions call for taking the ballast resister out of the system - Pertronix or MSD would be a couple.
         
      • Canadian1968

        Canadian1968 Well-Known Member

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        It turns out an accel (super stock) coil I have has 1.4 ohm. Perfect !
         
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        • Canadian1968

          Canadian1968 Well-Known Member

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          Well after a bunch of reading both from different sites including MSD site itself, The coil on the car right now is a MSD street fire . Directly from MSD instructions it's says " if using points ignition a Ballast resistor MAYBE required " I stress that maybe point .

          Anyway I did the hide away HEI 4 prong swap and the car fired right up. I hate to admit but the car idea smoother and the throttle response seems a bit more crisp .

          BUT one thing I noticed . I took some readings before I unhooked anything . The regular mopat orange box and coil gave me a reading of 9.5v at idlel and a 4.5amp draw.

          With the HEI module I am getting full battery - 13.4v but only 2.2 amps I thought that was interesting .

          I wonder if u put in a matching E-coil if it would change that .

          The car also leaned out quite a bit on my wide band..... very interesting . Waiting for rain to stop will take it for a drive next
           
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