Hi all, Hope everyone's doing good! Last summer I removed the Mopar electronic ignition from my 69 383 Superbee and installed the pertronix 1 ignition in my original point distributor. With their coil and wired the ballast thru with a 12 gauge wire. The mechanical advance is setup the same way as the mopar elect. ignition. 23° degrees in dist. same advance springs, 38-39° full advance at 2000 rpm and 15-16° of initial timing. What's weird is with the pertronix installed my engine was running approx. 5-10° cooler than with the mopar elect. ign.? Everything is the same other than the different electronics and the vacuum adv. on the mopar ign. gives me 56° adv. on highway where the stock adv. only gives me 53°? Unfortunately I had to remove the pertronix back in October due to it started pinging one morning while going for a cruise. I decided I will investigate this soon. Anyone experience this with switching over to a pertronix say from the mopar elect. ign? I have a buddy who owns a 67 GTO and he has read this once on a Pontiac forums before where someone mentioned this happening. Thanks, Dave

Are you saying the one dists' vac adv gave 3 deg more or less advance than the other?. if it is running 5-10 deg cooler at a certain steady speed you might alter the initial 3 deg so "at speed" you now have the same total as the other & see if the temp is now the same. Yes I would find out what happened on the P or elsewhere dist related that made it ping. EDIT Dave that ain't a long read! (& it was interesting) MORE EDIT I reread & the point dist can with P installed gives 3 deg less than the electronic conversion did? adv the initial 3 deg & see if the temp jumps back up 5-10 deg

The mopar advance is rated at 8.5 or so and the adv. on the point dist. is something like 7.5-8.0 so if you add this onto the 38° of mech. timing it gives you 56 and 53 or 54° full advance on highway. The temp stays cooler through out at no particular engine speed. Can a longer spark jump from the rotor to the contacts in the distributor cause the spark to become hotter or introduce more heat to the plugs. Afterall, my plug tips are bending off center of the electode like it is getting too hot! Reason I ask is because the black rotor button for the pertronix is slightly longer than the factory white one. Recently I switched out the rotor buttons and I am trying it out in the mopar ign. and installed a newer pickup in the mopar elect. dist. It's called the process of elimination! Maybe it's not that the pertronics is making it run cooler but maybe it's the 17 year old mopar ign. which is causing it to run hotter? Anyway I have plenty of parts to test when it comes to dists. I believe this is my forte! I have been playing with dists. a long as I can remember! Thanks, Dave

I think I would put the Pertronix back in and try running a colder plug to help with the pinging.
Ron

Thanks Ron, I really liked it when I had the pertronix in it. Less wires to make the engine look cluttered and not stock looking at all. It really puzzled me when for 3 months I had no pinging then on a Sunday morning in October when it was 56° it starts to ping. I tore the dist. apart and put everything back in and I have decided to put the pertronix back in possibly today.

something changed that bumped up the timing (that changed the temp/caused the pinging) either something electronically within the P system or more likely something with the dist (how the P is mounted (good chance) or dist holdown got loose (not likely). DO NOT let it ping at all. holler with any news

possible bad gas?