distributor points with black "dust"

[cdomingos170]

Hi,

I have 69 911T.

I installed a MSD 6A ingniton and it runs very well.
Today (about 500Miles from the msd instalation date), I heard a noise coming from the distributor and the "ralenti" rpm was a bit high (2000rpm).
I removed the distributor cap and the points were a bit black, I polished the points, put the cap back and it becomes nice again.

There is any thing I should do to avoid this situation?

Thks,
Carlos
(portugal)

[Neel]

You could go to a Pertronix unit and eliminate the points.. Our host sells them.. You will need to match the unit to your distributor number.. Easy install..

[cdomingos170]

Thks Neel,

But I didnt say it right.
Was not the poits that turns black but the metal parts in the distrubitor cap and the rotor contact with them.
Sorry about my bad tech english.

[Flieger]

The arcing spark tends to oxidize any metal you place there. The corrosion may be black colored depending on the metal present. It also produces ozone, which degrades rubber and some plastics.

There is nothing you can really do to stop the corrosion. Maybe stainless steel, but that is not as efficient a conductor as copper or brass. The corrosion is simply a result of normal spark distribution.

Just clean them every so often.

A high power spark like MSD may cause the oxidation to build up sooner.

[gsjohnson]

Replace your condensor

[cdomingos170]

I dont have condensor. MSD replace it all.

[Bill Verburg]

Originally Posted by cdomingos170

I dont have condensor. MSD replace it all.

There should be a condenser connected to the point set only on conventional ignition setups. They are not used on CD setups either stock or MSD. The purpose of the condenser is to absorb the arc energy when the points open or close, preventing burning and pitting of the points. In a conventional ignition there is a relatively high current across the points, this is not the case w/ CD ignitions where only a tiny trigger current goes through the point set.

You may be getting arcing at the contacts in the cap, I don't know what you can do except make sure that everything is kept clean

[cdomingos170]

The problem still hapening.
Should i go to a Pertronix unit?

[cdomingos170]

Originally Posted by cdomingos170

The problem still hapening.
Should i go to a Pertronix unit?

please...

[HawgRyder]

It sounds like you have carbon dust on the inside.
This may come from the little "button" in the centre of the dist cap.
If the centre rubbing part of the rotor is not completely smooth...it will grind that button slowly...giving you a carbon dust problem..and as you know..carbon conducts electricity.
This can give you a misfire situation.
Bob

[304065]

Carlos it sounds like you need to clean and lubricate the distributor. The sticking high RPM suggests that the advance mechanism is not returning to idle advance when you let off the throttle.

It is a simple matter to remove the distributor and clean and lubricate it and put it back.

[cdomingos170]

Thanks to both replies!

Best regards,
Carlos

[Steve@Rennsport]

If the distributor's shims are worn, the unit gets too much end-play and that puts excessive pressure rotor pressure into the carbon button at the center of the cap.

One should check the distributor for both axial (shims) and radial wear (bushings).

[cdomingos170]

I bought an Ignitor Electronic Ignition (2862), on Pelican Parts Site (USA) to install on my Porsche 911T (year:1969).
My car has a MSD 6A ignition kit installed (installation scheme attached).



After reading your instructions manual (attached also) I installed it putting:

1. Ignitor black wire to original distributor green wire (that goes through MSD to Coil Negative)
2. Ignitor Red Wire Directly to Coil Positive



… and the motor do not run. I try other several ways and nothing!
I take out the ignitor and put back the points and it is all ok again.

What should I do?

Regards,
Carlos Domingos
Portugal (Europe)

[cdomingos170]

seeing the drawings again...
I will try:

- Pertronix Ignitor Black wire >>> original Green wire > MSD White Wire
- Pertronix Ignitor Red wire >>>MSD Red wire

[BURN-BROS]

Originally Posted by cdomingos170

seeing the drawings again...
I will try:

- Pertronix Ignitor Black wire >>> original Green wire > MSD White Wire
- Pertronix Ignitor Red wire >>>MSD Red wire

This is the correct way.


However you may have damaged the ignitor when you wired it to the coil. If it does not work you may need to get another one.

[cdomingos170]

thks