06-08-2010, 03:19 AM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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Why these caps burn up
Purple Venom Here is the problem and their fix
Old caps had a spring and a steel/copper center post, with a normal coil up to about 40K volts, it had no problem You could get many years out of it.
The problem started with Accell super coils back in the 70's, MORE POWER. Basicly you are arch welding inside the cap
To slow down the burning of the rotor and cap post the extended the rotors air gap to kill some of the spark, this fixed the problem up to 60K volts.
Today 60-100K coils getting to be the norm or coil on plug setup. The centers are carbon, it's the only way to not melt the center contact. Too much heat and even the carbon is burnt out. Some of the guys are using one of the old GM caps from autozone or Pep boys. I don't have the cap or rotor numbers but say they are having good luck with them. I have seen one cap and rotor with a hole through the rotor spring end and the cap melted in the center area. The fix is to lower the coil output. The MSD still will give you about 20 degrees of spark to the plug. I have a friend running the Nology spark plug wires that have capacitors in each wire. They are not cheap and have to be grounded to the motor block and have a good ground also. This may be a way around the burnt cap and rotor problem.
Pat your cap looks pretty good for 4K miles on it. I'm on cap #3 and rotor #2 from racing with HVC MSD coil. Rick L.
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