distributor cap and rotor tip heating up melting and can't figure out why

[Mikey's 68 RT]

Hello I have a 70 charger with a 440hp stock engine. I just converted to a electronic distributor with the summit conversion kit. I also added a MSD blastor 2 coil. Car will run for a week and then stall and distributor rotor head is warped and inside of distributor cap? I replace them and then in another week I am back to the same problem. I can't figure out what is going on. The only other symptom is 2 days after the new rotor tip and cap are replaced I get ruff starts. Please help with any ideas? I wired the ballastor with the factory brown wire and the positive wire from the coil together connected to one side of the ballastor resistor and the the other side is the wire from the ECU and the factory blue wire with the white strip. Could this be the wrong wiring that is causing my problem? Thanx for your help

 

[HEMI-ITIS]

What is the gap on the spark plugs?

 

[mopar 3 B]

Sacrifice a cap and check for an airgap from rotor pickup to cap coil lug. No gap should be present.

 

[Mikey's 68 RT]

Factory spark plug spacing and air gap is correct. Thanx for your responses. Please continue to help me brain storm.

 

[rumblefish360]

Factory spark plug spacing

.030/.035 spark plug gap?

Try .045.

Rotor melting? Garbage rotor or to much energy from the coil to the cap.
With your coil, I don't think that's possible. It happened to me with a Jacobs Pro arrest coil on a Hyundai excell. It would crisp the rotor.

 

[Qbrozen]

Coil was also my first thought. Do you have your old one you can put back on and see what happens?

 

[HALIFAXHOPS]

what brand cap are you using?

 

[Nacho-RT74]

Get a clear cap and check it while working

They are available even with copper terminals! Well or maybe I have being lucky getting a couple of both locally!

 

[HALIFAXHOPS]

Good call was going to say a nos mopar or accel.

 

[Mikey's 68 RT]

Thanx guys for your help. I am getting 9volts at my coil so my aftermarket MSD blastor 2 should be ok I think and not causing the problem.

 

[Nacho-RT74]

Actually it seems to be a good quality product although unbranded. I have one on my car which used to check phasing then was too lazy to reinstall the original one LOL

 

[rumblefish360]

Actually it seems to be a good quality product although unbranded. I have one on my car which used to check phasing then was too lazy to reinstall the original one LOL

Where did you get that?

 

[Nacho-RT74]

Locally in Venezuela looooong time ago... dunno where it could be found in USA

 

[Nacho-RT74]

it seems firecore crew got these sometime ago

http://www.yellowbullet.com/forum/showthread.php?t=484316

 

[Qbrozen]

Thanx guys for your help. I am getting 9volts at my coil so my aftermarket MSD blastor 2 should be ok I think and not causing the problem.

The problem is not what is going into the coil but what may be coming out of it.

 

[HEMI-ITIS]

Hotter ign system increases the temps in the cap.If the rotor tab is contacting the cap then a few breather holes can be drilled in the cap to lower temps.

 

[HALIFAXHOPS]

or a Mopar Performance cap has a vent built in.

 

[HEMI-ITIS]

or a Mopar Performance cap has a vent built in.

That one I think is the single vent on the top.I drilled several holes around the base of the cap.

 

[mopar 3 B]

Coil no matter how large will only put out what is asked of it. Like the Mitsubishi engine in the Avenger will burn the cap every time its put on loose. The center post should not have an air gap. Current jumps the gap and burns the post.

 

[HALIFAXHOPS]

Stoupid question, does the cap have a spring loaded carbon in the center and using a rotor with the contact bent up to meet it?