...and some are stamped around the neck of the
vac unit right up at the nipple where the vac line
attaches.
Paul Tegler
wizardz@toad.net
www.teglerizer.com
----- Original Message -----
From: "Dodd, Kelvin" <doddk@mossmotors.com>
To: "'Ken Waringa'" <kwaringa@dynsys.com>; "Dodd, Kelvin"
<doddk@mossmotors.com>; "MG" <mgs@autox.team.net>
Sent: Monday, January 28, 2002 5:03 PM
Subject: RE: Distributor choices
> Ken:
>
> The numbers on the advance units are very hard to see. They are on
> the face towards the distributor (if I remember correctly) and may need
some
> emery cloth cleaning to become visible. They are there.
>
>
> Kelvin.
>
> > -----Original Message-----
> > From: Ken Waringa [mailto:kwaringa@dynsys.com]
> > Sent: Monday, January 28, 2002 9:00 AM
> > To: Dodd, Kelvin; MG
> > Subject: RE: Distributor choices
> >
> >
> > Kelvin and all. I looked at the vacuum advances from both
> > distributors, but
> > could find no numbers or identification markings on them. I
> > reconfirmed
> > that both are 25D4 distributors, the only outside difference is one is
> > marked 40897 A and the other is marked 40897 E. The internal
> > centrifugal
> > advances are different though. The one with the A is marked
> > 10 degrees and
> > the one with the E is marked 16 degrees. The mechanical stop for the
> > centrifugal advance is clearly different as well.
> >
> > If anyone could advise which of these distributors would be
> > best on a stock
> > street car. I plan to use the HIF carbs on the car.
> >
> > Thanks,
> >
> > Ken
> >
> > -----Original Message-----
> > From: Dodd, Kelvin [mailto:doddk@mossmotors.com]
> > Sent: Wednesday, January 23, 2002 2:14 PM
> > To: 'Ken Waringa'; MG
> > Subject: RE: Distributor choices
> >
> > Ken:
> >
> > Someone out there please double check me, cos I've got a 5pm
> > deadline and can't spend any more time on this.
> >
> > The records I have show the 40897 dizzy as being
> > original fitment on
> > 62-67 MGB definitely not for the 74 cars you have. Lucas
> > shows a 41288 unit
> > as the superceded replacement. The first 5 digits give the
> > part number, the
> > suffix is not used for identification.
> >
> > Any unit with the same 5 digits should be identical, given the
> > vagaries of production line, later modification and divine
> > intervention.
> >
> >
> > Based on dubious years of swapping bits, I'm banking
> > that both your
> > engines got dizzy swaps from the original rare bird 41491 to
> > the much more
> > available earlier unit.
> >
> > If you get me the part numbers off the vacuum advance
> > units which
> > may be 54411230 with the following legend 5.13.10 underneath
> > I can be of
> > more use.
> >
> > The problem is what carbies are you using? HIFies, or HS?
> >
> > It sounds like you may have a common case of mix and match,
> > and you are
> > asking the right questions to figure out what combination
> > will work the
> > best. First we gotta figger what you really have.
> >
> >
> > all the best
> >
> > Kelvin.
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