Hi, Paul. You are probably addressing this to me, since I posted some
questions on the topic a few months back.
I did have a DM2 distributor, and I wanted to move into a Pertronix electronic
ignition. What I found was, there is a Pertronix unit for the DM2, however it
comes only in positive ground. I had converted to negative ground.
I did source both--a 25D distributor and a negative ground Pertronix unit for
it--from Fred Thomas. It dropped right in with minimimal effort, fits snug,
and runs the car at peak performance, so the TR3A is finally free of the
not-so-subtle degradations in power that I was experiencing as the poor quality
plastic arm on the points rapidly wore down. I didn't keep the model number on
the Pertronix unit, though.
Have fun!
Terry, (TS 58667)
New Hampshire
-------------- Original message --------------
From: "Paul Dorsey" <dorpaul@negia.net>
> Hi,
> It's been a long time since you posted this:
>
> Mechanically, there are differences between the DM2 and 25D4 units, This
> means that the Pertronix magnet sleeve that is correct (size/orientation)
> for one is not right for the other. Even then there was variability in
> production tolerances. The Pertronics for my 25D4 did NOT have a snug fit
> on the shaft and wiggled probably 3 degrees in either direction. Tech
> Service told me how to improve that, but it was definitely a Rube Goldberg
> fix.
>
> But I was wondering, did you ever get a Pertronix (or other brand) to fit in
> your 25D4 distributor?
> I am thinking about it.
>
> Thanks,
> Paul Dorsey
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