Power wire for electric choke.

Discussion in 'Sparky's corner' started by Houndogforever, Nov 26, 2021.

  1. Quick Buick

    Quick Buick Arlington Wa

    My Question is ( not to you specifically). why does mallory want the lower voltage going to the coil??? and higher to the electronic module in the distributor???
    Makes zero sense to me.. When the MSD ,,, pertronix and others want full 12 volts...
     
  2. Houndogforever

    Houndogforever Silver Level contributor

    I have no idea why. It does say I can just hook everything up to the resistance wire but then warns about running too high a voltage thru the module.
    I'm sure it will fail completely and I will need to re-wire again.
     
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Maybe because their coils lack sufficient resistance? Maybe the module needs the higher volts for a proper signal? Doesn't make much sense to me either.
     
  4. Houndogforever

    Houndogforever Silver Level contributor

    The thing is, you can buy coils with all different resistance on their primary. 0.4 or 0.6 or 0.8 or even 1.4ohm which should be used without a resistance wire as it is built into the coil.
    Mark at Mad electrical was saying that since Buick's tend to run slower RPM, they want more power to the coil at low RPM so therefore it would be a lesser resistance but higher voltage.
    You go to an engine that has it's happy spot at 3500 rpm, the entire system is running at full 14.4v and you would get your high rpm voltage to boost the spark. But since Buick's happy spot is more about 2000 rpm, the system is running pretty slow and "MAY" not get the voltage high enough.

    I think.
    I'm probably wrong.
     
  5. 12lives

    12lives Control the controllable, let the rest go

    Yes to your question about triggering the relay. Also, you might call Mallory tech line and ask them why. You may find it's not important. I've called some tech lines and gotten work arounds and short cuts to printed instructions which are written to CYA for the masses.
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    None of that makes any sense to me at all. Any ignition system has to be able to meet the spark demands of the engine at all RPM's and cylinder pressures. Buick engines have the same demands as any other engine.

    If you want to use the Mallory Unilite, I would replace the resistance wire end to end, and wire it with a ballast resistor just like in Figure 1. That's the right way to do it IMHO.
     
  7. Houndogforever

    Houndogforever Silver Level contributor

    Fresh off the phone with the Mallory boys.
    He states that the coil MUST have over 2.0 ohm total on the primary + side. The harness is 0.8 and a MSD blaster coil is 0.7ohm which is only 1.5ohm and will therefore burn out the module.

    So I need to add another .5-.8 ohms or bypass the resistance wire and use a 1.4ohm resistor before the coil.

    Anyway, ultimately, I'm ordering a pertronix coil that has 1.5ohm primary resistance, match that with my 0.8 ohm harness and I end at 2.3ohm, right where I want.
     

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