hei carbon rotor button

Discussion in 'Ignitions & starters and electrically related comp' started by Danny Soda, Jul 19, 2018.

  1. Danny Soda

    Danny Soda New Member

    These buttons have been burning a hole in my cap after about 600-800 miles. I found out that MSD carries the low resistance buttons and trying it now. But I was curious if I can measure the resistance of this button to compare with a regular one.

    I did a comparison test, a regular MSD button (which comes with a new Cap) vs the low resistance and they both measured around 60 - 70 ohms. Not sure if this is a proper test procedure? As I'd have to purchase a $14 button every time I do a tune up.

    I measured the previous button that burned out the cap and it read over 2 Kohms. So I don't know if the bad button was always this high in resistance or if it went bad and resistance went higher.

    I am running MSD6AL, HEI with built in 'Hi Performance coil' (suppose to be higher voltage i was told)

    I also regapped my plugs from .45 to .38.
     
  2. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    The Low resistance HEI Center carbon brush has a higher copper content.
    Able to carry higher current without heating up.
     
  3. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Not a big Fan of MSD much anymore.
    So many issues reported.

    Davis DUI. HEI. Known to be 100% reliable.
    If not a High End race car it will get the job done.
     
  4. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Your resistance readings sound correct, but I can measure mine for you tonight if you need confirmation.
     
  5. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    I did a resistance check of the two buttons.
    Stock carbon = about 8000 ohms
    MSD Low Resistance = 2 ohms
    Surprised me - I didn't the difference would be that much.
     
    Last edited: Jul 22, 2018
  6. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

  7. Strictly Attitude

    Strictly Attitude solid fixture here in the forum

    no more caps for me o_O Brian also has right idea magneto
     

Share This Page