[FWDLK] Vacuum advance question.]

[David Homstad <dhomstad@xxxxxxxxxxx>]

Neil,

No, one size does not fit all. Mopar used different vacuum advances that had
a built-in amount of ignition timing advance ranging from 8 to 26 degrees.
These are also adjustable by changing the internal spring to adjust the rate
of advance.

The number stamped on the little arm that comes out of the diaphragm: that
is the amount of vacuum advance the VA is good for, in distributor degrees.
For actual engine timing degrees, double that. The 13 on your example is 26
engine degrees.

The correct vacuum advance is still critical to proper starting, idling,
cruising, power output, fuel mpg, over-heat protection, piston and exhaust
valve protection. An engine that requires a 8 degree VA that gets a 26
degree VA will suffer extreme pinging and detonation, resulting in holes in
the pistons. An engine that requires a 26 degree VA that gets an 8 degree VA
will suffer low power, very low mpg, and eventual burnt exhaust valves.

Dave Homstad
56 Dodge D500

-----Original Message-----
From: Forward Look Mopar Discussion List
[mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]On Behalf Of Eastern Sierra Adjustment
Svc
Sent: Wednesday, April 08, 2009 2:33 PM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: Re: [FWDLK] [Fwd: [FWDLK] Vacuum advance question.]

Thanks!

I checked all the P/N cross references on that NOSMoPar site, and this
V.A. does appear to service
all of the 57 Dodge (and DeSoto Firesweep) V/8's, without further
explanation, but, I wonder if anyone can research what, in
particular, a D500 and/or Super D500 might require, for a vacuum advance
( P/N) , as it/they might differ from this guy's
general " V/8 " operating-specifications?

Or, does one-size-fit-all, as far as vacuum advances are concerned?

This one does have a "13" appear on its control arm.

Neil Vedder



Jim Carpenter wrote:
> Just a reminder that you can find the application for many numbers
> including this one at WWW.NOSMOPAR.COM or WWW.CollectorsAutoSupply.com
> <WWW.NOSMOPAR.COM>
>
> Go to the "Parts Department" and then "Look Up A Number"
> <WWW.NOSMOPAR.COM>
>
> The site shows "P 57 W/ PREFIX "P" ON ENG, 58-60; D 57-60; DS 57 F'SWP"
> This means it is for a few 57-60 Plymouth, Dodge and Desoto models.
>
> ------------------------------------------------------------------------
>
> Subject:
> [FWDLK] Vacuum advance question.
> From:
> Eastern Sierra Adjustment Svc <esierraadj@xxxxxxxxxxx>
> Date:
> Wed, 08 Apr 2009 11:13:53 -0700
> To:
> L-FORWARDLOOK@xxxxxxxxxxxxx
>
> To:
> L-FORWARDLOOK@xxxxxxxxxxxxx
>
>
> I bought a MoPar vacuum advance on the Evil pay, recently.
>
> As seen in the attached pic, it was long-ago (apparently) written down
> as being
> for a 57 D500.
>
> I bought it, as it was cheap, even though its P/N is not shown in my
> 1955-1958 parts book.
>
> Dave Homstad suggested that this guy might be for a truck, which would
> not have listings in the
> 55-58 car-parts book.
>
> Does anyone have access to a '58 (apparently, from its P/N) truck
> parts book, and/or any thoughts
> on its cross-usage on a particular car's application?
>
> The cast-in number, on the V.A.'s control arm, is "13" .
>
> Thanks,
>
> Neil Vedder
>
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