Dual Points
Dual points work better by improving the amount of time the points are
closed or the dwell as it is called technically. One set breaks the
connection to make the spark but the second set closes almost
immediately afterward to start the coil saturation process all over.
Typical values for dwell on a single point dist would be 27 to 32
degrees. With a dual point values of 37 to 42 are quite attainable so
the coil has more time to "reload" so to speak. This helps especially at
higher RPMs . Also, most, if not all, dual point distibutors are
intended for Hi-Performance use and have a much more agressive advance
curve which really wakes up a sleepy engine. That subject was covered in
Chrysler Power Magazine last year in an article called "Mission
Ignition." I think it was the July or Sept issue for those who have
access to it. This better advance curve is what probably picked up your
general performance as the extra dwell doesn't make much difference
until you reach higher RPMs (Above 4000 for example) which doesn't hurt
either.
DOn DulmaGE
Dave Stragand wrote:
>
> Well,
>
> Since I gave up smoking in February, I've been finding myself always
> cleaning and cleaning to pass the time. Tonight was "clean the kitchen"
> night, and strangely enough, I found a dual point distributor (IBP-4003)
> in my crock pot.
>
> How it got there is anybody's guess.
>
> I had rebuilt it back in '97, but somehow I forgot all about it. I
> decided that since it was a nice night, I'd throw it in the Duchess and
> see how it worked. To my amazement, the Duchess is simply
> purrrrrrrrrrrrrring now. Dual points, she likes! I never realized how
> bad my other distributor was until now, but with the new one, many of my
> engine problems are now gone. The idle has smoothed out to a
> perrrrrfect purrrrrrrr, the power has increased about fivefold, and she
> starts with just a flick of the key.
>
> My first question is, is this a "dual-point" thing, or simply a
> "distrubutor that works" thing?
>
> Question number two: She always has to warm up for about five minutes
> in reverse before the Torqueflite will pop into any forward gear. A few
> of us on the list here have the same problem, but none of us have been
> able to track down the cause, let alone the solution. As a
> possibly-related sideline, the trans won't kick down when I stomp the
> pedal, either. Anyone have any thoughts on a fix before I have the
> whole thing rebuilt?
>
> -Dave
>
> PS - It was a nice night for cruising in Western Pennsylvania. I'm
> loving the summer again already!
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