Re: [Chrysler300] Distributor rebuild - where?

["Don Verity" <d.verity@xxxx>]

The singe point breaker plate rests on three bronze pads, and is held down
with a spring steel clip. It's not the most accurate system, and does not
swing through a perfect central arc, thus the dwell change. Chrysler was
aware of this and gives an acceptable dwell variation in the shop manuals.
The dual point plate pivots on a ball bearing, on center with the shaft.
300ly,
Don
----- Original Message -----
From: Marshall Larson <yelof@xxxx>
To: <chrysler300@xxxxxxxxxxxxxxx>
Sent: Tuesday, December 17, 2002 9:51 AM
Subject: Re: [Chrysler300] Distributor rebuild - where?


> If the dwell changes when the vacuum advance moves the breaker plate, the
> plate must be mounted excenteric to the shaft. Are you saying that is
> the case? If it is, I didn't know that.
>
> Marshall.
>
> On Mon, 16 Dec 2002 19:45:06 -0800 "Don Verity" <d.verity@xxxx>
> writes:
> > Dwell is the time in degrees that the coil is building up energy to
> > fire the
> > spark plugs. More is better, to an extent. To much will leave you
> > with a
> > small point gap and they will burn rapidly, to little and you will
> > not get
> > enough coil saturation time and will wear the rubbing block on the
> > points
> > faster. The reason for duals is to get more dwell without the bad
> > effects of
> > a small point gap. Just before the first set closes, the second
> > starts to
> > open, so you get the combined dwell of both sets. Each runs at 28-32
> > degrees. With both running you get almost 40. I usually change the
> > points in
> > my G every couple of years. Back in the "old days" when all cars had
> > points
> > and were daily drivers, tune-ups were a twice a year thing. Changing
> > your
> > point gap will change the timing, as will point wear.Worn bushings
> > on an
> > electronic distributor won't effect dwell. If it's bad enough
> > though, the
> > reluctor will contact the pick up coil with bad results! Worn
> > bushings in a
> > point set up will definitely effect dwell because the shaft is
> > moving around
> > changing the point gap. On most single point systems, the vacuum
> > advance
> > will change the dwell also. Sometimes by 4-5 degrees. The dual
> > systems
> > breaker plate rides on a bearing and is much more accurate, usually
> > within a
> > degree.
> > 300ly,
> > Don
> > ----- Original Message -----
> > From: Owen & Jo Grigg <ram300@xxxx>
> > To: <chrysler300@xxxxxxxxxxxxxxx>; John Hertog
> > <crossram@xxxx>
> > Sent: Monday, December 16, 2002 1:15 PM
> > Subject: Re: [Chrysler300] Distributor rebuild - where?
> >
> >
> > > Hi John & all
> > >
> > > I am running a Pertronix unit on my 300C, doesn't seem to be any
> > noticeable
> > > difference in idle or performance. Haven't checked the dwell, just
> > installed
> > > the Pertronix and put a timing light on the crank. I thought the
> > main
> > > reason for correct dwell angle was to take the heat away from the
> > > points....stop them burning out? Does it also effect ignition
> > timing? Can
> > > you compensate by turning, advancing/retarding the distributor?
> > Could it
> > > just be flogged distributor bushes causing problems on some cars
> > with
> > > Pertronix systems?
> > > As you can see I'm a bit of a novice when it comes to
> > distributors.....so
> > go
> > > easy on me ok.
> > > What are the symptons I should be looking for??Don't much like
> > changing
> > > points, but if it makes more power.......
> > >
> > > Owen
> > >
> > >
> > > ----- Original Message -----
> > > From: John Hertog <crossram@xxxx>
> > > To: John L. Chesnutt <chesnutt@xxxx>;
> > <chrysler300@xxxxxxxxxxxxxxx>;
> > > Vath, Michael J. <mjvath@xxxx>
> > > Sent: Tuesday, December 17, 2002 6:56 AM
> > > Subject: [Chrysler300] Distributor rebuild - where?
> > >
> > >
> > > > Hi Mike,
> > > >
> > > > The actual bushing is available from NAPA . I don't recommend
> > the
> > > > Pertronix - dwell is unacceptable, and cars I installed
> > Pertronix on had
> > > to
> > > > be reconverted to points. As far as rebuilder, you might want to
> > contact
> > > Don
> > > > Verity - d.verity@xxxx ; he has a Sun distributor machine,
> > and can
> > set
> > > up
> > > > the distributor properly as per spec once he has rebuilt it.
> > Don's
> > rebuilt
> > > a
> > > > few for me.
> > > >
> > > > John
> > > >
> > > >
> > > >
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