Pertronix Help/Advice
 

I installed the Ignitor II in my 73S.
I never minded installing points however, the last 2 sets of Bosch points seemed to lack a little in their manufacturing. The points would not make a level contact and when closed they sat low on the contact tab not in the middle.

The Pertronix install went well and prior to installing the dist. I made sure the wires were clear of the vacuum plate and the rotor or cap did not touch anything. I verified this by sucking on the vacuum plate and spun the dist. on the bench.

The car fired right up but it idled very high(2000 RPM) even after warm up because the idle timing was way advanced. After several attempts removing the dist. and changing the ignitor gap both large and small the timing was still advanced. I then changed the position of the dist. until the timing was correct and then noticed that the rotor was pointing to # 6 plug wire, but the timing marks on the crank and housing were correct with the timing light. Even with this setting the dist was moved way over to the retard side and I was still a little advanced at idle.

I put points back in and did not even gap perfectly and the car is fine.

Am I missing something on my Pertronix install?

in days of yore, one would occasionally need to tweek the points around a bit until they mated nicely. seems that detail has been forgotten these days.

Regarding rotor pointing at #6, see this thread.

http://forums.pelicanparts.com/porsche-911-technical-forum/792528-valve-adjustment-confusion.html

I did tweek the points but I do notice that after a few miles they do return to a less than perfect strike.
The rotor is pointing to # 6 with the ignitor on is the indication that the timing is too advanced. When points installed the rotor lines up.
I guess in theory I could change the spark plug wires to have cylinder # 1 fire on the # 6 position of the dist. and re route the firing order, but that seems lame.

I'll call Pertronix Tech support today.

Don't know the answer but wanted to offer that my experience with pertronix on a carb'd 2.4 was extremely positive. my car was eating points to the extent that I actually did have to stop at a convenience store and borrow a match book. Got tired of that and went pertronix. worked well till some jackass planted a tree in the wrong part of a field.

i dont know much about the pertronix setup but i do know that when i put the MSD unit in my 930 the trigger slope from the dist was 180 degrees out of phase for what the MSD needed. this made my idle very hi due to the timing being extemely advanced. when i change the phase of the output of the dist everything was back to normal and i only had to adjust the timing just a few degrees.

the reason i say this is that i have seen several people post this same timing problem with the pertronix. if the phase of the trigger form the dist to the bosch CD is out of phase for what the bosch requires, this could make the timing advance.

if i left this way, the timing can actually advance due to the slope of the trigger moving in time as the RPM's go due to the fact that the signal level increases. at least this was the issue with my setup.

i dont know the pertronix so something entirely different may be the cause.

The Pertronix unit functions the same as a set of points, i.e. the unit provides an open
circuit at each distributor lobe and then grounds at the flat section of the distributor
shaft.

but it does it electronically right?

i would like to see the signal on an O scope.

As I recall it uses a magnet in place of the contact points.

Yes, it uses a Hall-Effect sensor input and a switching transistor as an output.
If you were to view it on an O-scope connected to a Bosch 3 pin CDI or a MSD
(both points input), you'd see a square wave.

The Tech support at Pertronix really gave me no answers. They wanted me so send them my dist but finally settled on sending back the ignitor and they will test the magnets.

While I had the dist out I lubed it and put points back in. I set gap and checked dwell and went for a ride. The tack began to bounce and car ran like crap. You always panic when you screw around with so many things but, it turned out to be the points got oil film on then. Probably too much oil or too much grease on rubbing block. I hope!