MSD Ingition coil question
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MSD Ingition coil question

  1. #1
    Senior Member Scapegoat's Avatar
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    Default MSD Ingition coil question

    Doing a routine weekly drive start and check I notice some constant arking on the neg conection of the coil where the male and female spade connect together. Thinking I should take it apart and clean up alittle as this could be due to corrosion starting to build up. Let me know if I am on the right track and what should I use as cleaning. Other than that It made some beautiful noise.

    Thanks in advance.

  2. #2
    gn7
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    Quote Originally Posted by Scapegoat View Post
    Doing a routine weekly drive start and check I notice some constant arking on the neg conection of the coil where the male and female spade connect together. Thinking I should take it apart and clean up alittle as this could be due to corrosion starting to build up. Let me know if I am on the right track and what should I use as cleaning. Other than that It made some beautiful noise.

    Thanks in advance.
    Yes, you should keep all those terminals clean. But I doubt that is the cause. What happens is the hi tension secondary voltage is arcing across the to ground termainal because there is something causing a resistance to the voltage jumping the plug gap. It could be spark plug wire resistance, plug resistance, a bad cap or rotor. When it becomes harder to jump the plug gap, it finds an easier path. The ground termainal on the coil is a perfect target. Many coils have a built in dam between the primary termainals, and the secondary hi tension lead from the coil.(see pic of accel coil) Hi compression and blowers just add to the problem. There is a way to increase the unlikelyhood of this happening. Make certain you have the best spark plug wires with the lowest resistance that you can afford, and install a MSD power tower on the coil. The tower will require a different lead on the coil end because it uses a HEI type male terminal. But in helps block the spark from heading towards the negative primary terminal. And they are cheap.

    If you want to see what I am talking about, pull the coil wire out of the coil, and on a dark night, or in your garage with the lights off, crank you motor. the spark will jump out of the coil and zap the negative lead terminal. If its a dry night, and there is a breeze, it may not do it. In you garage, I can almost guarantee it will. And remember, to jump an arc that far, it has to ionize all the air in the sparks path first. Thats why it may not work on a breezy nite. The ionized air gets blown away before the arc can occur. Try that with a mag and you'll burn it out before it could ever arc that far. Thats the power of a puny little MSD 6 and a blaster coil. If the MSD can jump a gap easier than the plug, it will.



    LINK: MSD power tower



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    Last edited by gn7; 12-08-2010 at 10:09 PM.

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    Senior Member Scapegoat's Avatar
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    Thanks

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    ptc
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    Yea its doesnt need to be dark!!!! That arc can be seen out of a blaster with no problem! (on mine anyway) You may want to get some terminal covers over your NEG and POS coil terminals too. That just helps keep water and other impurities off them that cause the corrosion which can cause tracking to other areas too.

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    gn7
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    Quote Originally Posted by ptc View Post
    Yea its doesnt need to be dark!!!! That arc can be seen out of a blaster with no problem! (on mine anyway) You may want to get some terminal covers over your NEG and POS coil terminals too. That just helps keep water and other impurities off them that cause the corrosion which can cause tracking to other areas too.
    Yeah, but it is much more impressive in the dark
    A little of this CRC disalectric grease before you install the tower, and on every spark plug, and on every spark plug wire connection on the cap, and smeared on the coil terminals will go a long ways towards eliminating miss fires with a MSD. Every connection in our entire system is greased with this stuff mainly for moisture and corrosion. You have to remember how much power your dealing with. It WILL find a path. You just have to make certain the easiest path is the plug. the higher the compression, the higher the RPM, the more the plug wires put up resistance, the larger the plug gap, the harder it is for the spark to jump the gap, and other things start looking easier. Sometimes, even the next plug wire on the cap.



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    Quote Originally Posted by gn7 View Post
    Yes, you should keep all those terminals clean. But I doubt that is the cause. What happens is the hi tension secondary voltage is arcing across the to ground termainal because there is something causing a resistance to the voltage jumping the plug gap. It could be spark plug wire resistance, plug resistance, a bad cap or rotor. When it becomes harder to jump the plug gap, it finds an easier path. The ground termainal on the coil is a perfect target. Many coils have a built in dam between the primary termainals, and the secondary hi tension lead from the coil.(see pic of accel coil) Hi compression and blowers just add to the problem. There is a way to increase the unlikelyhood of this happening. Make certain you have the best spark plug wires with the lowest resistance that you can afford, and install a MSD power tower on the coil. The tower will require a different lead on the coil end because it uses a HEI type male terminal. But in helps block the spark from heading towards the negative primary terminal. And they are cheap.

    If you want to see what I am talking about, pull the coil wire out of the coil, and on a dark night, or in your garage with the lights off, crank you motor. the spark will jump out of the coil and zap the negative lead terminal. If its a dry night, and there is a breeze, it may not do it. In you garage, I can almost guarantee it will. And remember, to jump an arc that far, it has to ionize all the air in the sparks path first. Thats why it may not work on a breezy nite. The ionized air gets blown away before the arc can occur. Try that with a mag and you'll burn it out before it could ever arc that far. Thats the power of a puny little MSD 6 and a blaster coil. If the MSD can jump a gap easier than the plug, it will.



    LINK: MSD power tower
    Do they still make the supercoil? have one in the shop I bought in high school, when
    it was "the bad ass setup" prob. close to 30 yrs. ago! damn, I'm gettin' old!

  7. #7
    gn7
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    Of course they doSUPER COIL I only posted it because it has the clear view of a spark dam of all the pics I looked at.
    It really isn't that great of a coil. Just big. Only god as a points and condenser coil. As a transformer for a MSD/CD type ignition, its no better than a Blaster. Hell, its probably no better than a stock oem induction coil when used on a CD ignition. But it is impressive to look at.



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    Last edited by gn7; 12-10-2010 at 06:43 PM.

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    Impressive to look at? more like where do I mount this big, ugly yellow thing so no one will see it! like I said, close to 30yrs old,
    wouldn't use it on any of my stuff, kinda been using Jacobs Ultra Coils on my stuff for the last 10 or so

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    Senior Member Scapegoat's Avatar
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    Found bad wires, #1 won't event register on the ohm meter
    thanks
    Last edited by Scapegoat; 04-10-2011 at 06:41 PM.

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