Re: Ignition Timing

The info from the TVMC is not quite correct. Vacuum advance adds extra advance at light engine load to provide more complete combustion and efficiency (MPG). At full throttle no vacuum or very little will be present to activate the advance diaphragm so it does not count in the total. I have always shot for 38* total with 10 to 18* initial (as long as cranking speed is OK). Since I run automatics I like the mechanical all in by 2500 and you will have to limit that to keep your total to 35 to 38*. You can limit the amount by brazing the advance slot (one is enough) shorter to limit weight travel. The rate of advance is controlled by spring tension and those springs can be purchased from speed shops. Advance can be complicated but most of the time it's not rocket science.

You can check the forums at" for B bodies only" to gain other incites and Mopar Action had some great articles on the subject also.

I looked this summer at some car shows and saw many plugged vacuum advance canisters on mild engines-they are giving up gas mileage and running more uncombusted gasoline down past the piston rings-prematurely wearing them out!

Mike

On Sun, Sep 17, 2017 at 6:45 PM, <62-65-mail-list-club@xxxxxxxxxxx> wrote:

The the Tennessee Valley Mopar Club has a document online that may help. Combo of vacuum readings and timing
settings. The http://tvmoparclub.com/files/tech/Mopar%20Timing.pdf

Thanks,
Gary H.

> -------Original Message-------
> From: 'Paul L.
> Forgot to add that to my knowledge this is a stock Mopar dist. and I'm
> running a orange box.
>
> Paul L.
>
> On Sunday, September 17, 2017 at 12:50:42 PM UTC-5, Paul L.
> http://1962to1965mopar.ornocar.org/ml-le wrote:
>
> > I've heard some differing info over the years on ignition timing. I
> > was talking to MO recently, and the guy who set up his distributor
> > on his machine made the comment that setting "x" was all wrong for a
> > manual transmission. So I'm wondering if there is a difference in
> > what you do for manual vs. automatic. Right now I've got mine set
> > at 32* BTDC all in at @ 2500. This is 440 primarily street driven
> > car with a bit of a cam. I had been running with the vacuum advance
> > plugged off. I recently checked the timing because I was able to
> > borrow a timing light. I had a crappy one when I set it before. It
> > was retarded about 8* so more like 25* BTDC. So I reset it and the
> > result was that it seemed to run a little better but I had developed
> > a slight bog from a stop. So I'm wondering where I should go from
> > here? Should I hook up the vacuum advance and reset the total
> > advance? BTW it didn't seem to make any difference on my issue with
> > running hot in town
> >
> > Paul L.
>

> --

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