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Discussion Starter #1
I am helping a friend tune on his car a little and has an odd problem.
The setup is
427 windsor
turbocharged
Holley EFI
MSD 6al
Fast dual sync dizzy

The problem is that he keeps melting the buttons on the cap. Has anybody seen this issue?
 

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My first thought would be a rotor phasing problem, WTF do I know

Is it the same cylinder(s)? Bad wire?

What kind of wires? Any indication of missing? (False triggering due to EMI)

Cap venting ionization can be a problem.
 

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Discussion Starter #3
My first thought would be a rotor phasing problem, WTF do I know

Is it the same cylinder(s)? Bad wire?

It will melt the metal tabs on the bottom side of the cap. it doesn't take very long either.
 

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Discussion Starter #4
My first thought would be a rotor phasing problem, WTF do I know

Is it the same cylinder(s)? Bad wire?

What kind of wires? Any indication of missing? (False triggering due to EMI)

Cap venting ionization can be a problem.
I'm wondering how you check rotor phasing without a crank trigger.
 

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all terminals are getting burnt. not a 6 box. msd 7 box, taylor 409 spiro race wires. coil is a hvc pt # 8261. really looks like it is firing really late and arcing back to terminals in cap.
 

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Rotate the motor to BTDC timing at max boost (hardest to ignite) and check to make sure your rotor pointer is dead on with your #1 tab on your dist cap. That is how I do it anyway. Best of luck
 

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Rotate the motor to BTDC timing at max boost (hardest to ignite) and check to make sure your rotor pointer is dead on with your #1 tab on your dist cap. That is how I do it anyway. Best of luck
This does not "prove" rotor phase

Rotor phase problems especially with various types of electronic timing control, crank trigger, and on and on, including "in the distributor" triggers is caused SIMPLY by an unwanted offset (in time or degrees) between the trigger, when the spark happens, and where the rotor is when that spark happens

It has nothing to do with where the pistons are or the marks on the balancer.
 
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