hei carbon rotor button

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.
 
The Low resistance HEI Center carbon brush has a higher copper content.
Able to carry higher current without heating up.
 
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.
 
Your resistance readings sound correct, but I can measure mine for you tonight if you need confirmation.
 
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.
 
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