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  • New Coil -vs- New Distributer

    I have a 1978 cj5 with a 304 and the stock electronic ignition.
    Is the performance upgrade by adding a MDS or Mallory Coil worth the cost ?
    Will I need to replace the plug wires ?

    I could not find the aftermarket Coil voltages.
    The aftermarrket performance distributers seem to come with 50,000 volt coils.

    Trying to figure out if I should just replace the coil -or- complete distributer. Any comments welcome

  • #2
    Without knowing how your existing ignition system is functioning, it's hard to make any determination. If you are experiencing ignition problems that trace back to the distributor and a replacement is in order paying extra bucks for a HP distributor probably isn't going to make much difference over a new stocker. What gains are you looking for?

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    • #3
      I would suggest replacing the distributor with an HEI unit and new plug wires. That will solve most all your ignition problems.

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      • #4
        The jeep is stock. I finally got it in my name last year, (needed to gather everything to make it smog legal in California). The distributer is new and working good for stock. I only put 2400 miles on the jeep in the last year. I know this stock system does not throw as much spark as the aftermarket systems. I worry about replacing the distributer and having a problem with the distributer gear -vs- the new cam gear, ( I also needed to replace the cam to pass smog).

        I like a car that fires on a couple revolutions of the engine. I basically want the engine to fire quicker, I do not like a cold blooded an engine, and I do not like how the engine loads up when lugging.

        Would the aftermarket MDS, or Mallory coils be a quick fix ?

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        • #5
          coil will help get a hotter spark how much dont know your jeep no computer so if ing box goes bad you can hook a MSD box to the dizzy
          ford TFI coil would be a good pick
          motercraft better top end dizz then a HEI one

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          • #6
            The TFI made a world of difference from stock on my 6

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            • #7
              go HEI

              Originally posted by Jerry M View Post
              I have a 1978 cj5 with a 304 and the stock electronic ignition.
              Is the performance upgrade by adding a MDS or Mallory Coil worth the cost ?
              Will I need to replace the plug wires ?

              I could not find the aftermarket Coil voltages.
              The aftermarrket performance distributers seem to come with 50,000 volt coils.

              Trying to figure out if I should just replace the coil -or- complete distributer. Any comments welcome
              Recommend going with HEI from 4wd I just put one in my 75 304 at cost of 100$... best thing I ever did starts almost instantly with 50K volts to the plugs.... even gapped plugs at .52 as recommended....

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              • #8
                If you do decide to go HEI, Use the dizzy drive gear from your current dizzy. IF it chews up ( and it will do it quickly if at all) Check out Bulltear.com for a matched set.
                (sorry 4wd) I got a set from our host actually two sets and chewed both of them up within 200 miles. The bulltear set is still going strong after 2000 miles with no visible wear.

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                • #9
                  I put the HEI distributor from our host in my '83 CJ5, 258, about 6 months/ 2500+ miles ago. I didn't change gears, just dropped it in out of the box. So far it has performed flawlessly and well above my expectations. Maybe I'm lucky (it's about time) and everything will continue to perform well. I would recommend the HEI conversion. It's easy, fairly inexpensive, and a definite improvement in performance and my gas mileage seems to have improved. No complaints from me!

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