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Old November 3rd 04, 11:04 AM
Nate Nagel
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Steve wrote:

> Nate Nagel wrote:
>
>> Can someone tell me where I can find a source for an early 70's B/RB
>> vacuum advance? Preferably adjustable but not necessarily? I've hit
>> every parts store in the area and the only one that claims to be able
>> to get it just tried to sell me an A/LA unit (opposite rotation.)

>
>
> I'd like to know that also. Mopar electronic distributors last FOREVER
> (no side-load whatsoever on the bushings) except for the vacuum advance.
> The only way I know to get a new vacuum advance unit is to buy a
> rebuilt distributor, put its vacuum advance on my old distributor, and
> throw the "reman" distributor in the attic in case I ever get desparate
> enough to be forced to use questionable junk some day...
>
> The really sad thing is that whenever I find a junkyard distributor with
> a vacuum advance that doesn't leak, I grab it and use it and even though
> it may be nearly 40 years old, it lasts longer than the new cr*ppy ones
> they put on cr*ppy re-manufactured distributors :-/
>
> Interesting project you've got going, BTW. If you need to re-curve the
> Mopar unit, there are a lot of different advance springs that have been
> used over the years. Lightweight springs (fast advance) are easy to come
> by at speed shops or online, but if you need to slow the advance down
> you have to go junkyard diving. One interesting thing to note is that
> stock Mopar setups had one "light" and one "heavy" spring, but the heavy
> spring had a slotted end hook so it didn't do ANYTHING until the very
> end of the advance curve. IOW, running two stock "light" springs will
> actually SLOW the advance curve up to the point where the "heavy" spring
> would finally kick in, at which point it becomes faster. Not usually a
> problem, though, as speeding up the curve at the tail end of the curve
> (higher RPM) generally doesn't cause problems.
>


Yeah it appears that the Stude advance was set up the same way.
Actually this conversion is for sale commercially from one of the Stude
parts vendors but I'm chea^H^H^H^Hfrugal and decided to see if I could
figure out how he does it rather than spend $300.

Of course, I may come close to that by the time I'm done, but at least
I'll have spent lots of time on it and maybe I'll know what I'm doing <G>

nate

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