Paul: Wow, you are good! And correct about my misidentifying the serial
number on my dizzy. The number is 41693A 45DE4. It did come off a 1979 MGb.
My 1980 MGB LE has the dizzy with the external amplifier and I have not had
any problems at all with it. Since it is so easy to rebuild the external
amplifier it is a much more practical application than the dizzy it
replaced. I hope this helps and am sorry about that.
Frank
----- Original Message -----
From: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
To: "Frank Krajewski" <frankk@intap.net>; <Emjaxfl@aol.com>
Cc: "MG List" <mgs@autox.team.net>
Sent: Sunday, July 11, 2004 10:16 AM
Subject: Re: Wanted: 41599 Distributor
> 41698 isn't in my list of distributors for the MGB, that for the North
> American except California 76 to 80 model years was a 45DE4 41693 (is that
> what yours could be and not a 41698?) and for California and Japan a
41695.
> The 41599 has a dynamic timing of 13 degrees at 1500 and the 41693 10 at
> 1500, but thereafter they get closer together through the rev range. In
> practice the curves probably bear little relation to what is ideal today
> with our very different fuels and 30 years of wear and replacement
> components, short of a long time on a rolling road the best setting one
can
> expect is maximum advance without pinking at any combination of revs,
> throttle opening or load. However the 45DE4 had such a terrible
reputation
> for reliability I'm surprised there are any still around, many having been
> replaced under guarantee by the later factory 45DM4 unit with remote
> amplifier, and one may not last very long if brought back into service.
>
> It is amazing how many times a supplier will assure a prospective
purchaser
> that what ever they have in stock is "correct for your car, sir". The
41427
> was a generic replacement for the earliest high compression 18G engines
from
> 63 to 70, i.e. significantly different from a late low compression engine
> and with only half the required maximum advance as Eric found out. It
isn't
> even a good match for the 18G engines.
>
> PaulH.
>
> ----- Original Message -----
> From: "Frank Krajewski" <frankk@intap.net>
> To: <Emjaxfl@aol.com>
> Cc: "MG List" <mgs@autox.team.net>
> Sent: Saturday, July 10, 2004 9:47 PM
> Subject: Re: Wanted: 41599 Distributor
>
>
> > Eric: I have a distributor from a 1979 MGB. It has the internal
amplifier
> > like the 1975. Maybe we can use the list wisdom to determine if it would
> be
> > appropriate for your car. The numbers on the side are 41698A 45 DE4
1077.
>
> > Subject: Wanted: 41599 Distributor
> > > I have a '74 B with engine from a '75 (18V797AE). Does anyone have a
> > correct
> > > and properly functioning dizzy for this engine, the 45D 41599, that
they
> > would
> > > like to sell? I will reimburse the shipping costs. It seems that this
> > part
> > > is NLA from Moss, VB, or Proper MG.
> > >
> > > I have the replacement 41427 in the car now, purchased from Proper MG.
> > This
> > > has been my only disappointment with them. Despite my explanation of
the
> > '75
> > > engine in the '74 car, I was assured that the 41427 unit was correct.
> The
> > car
> > > runs reasonably well with the vacuum line not connected but not enough
> > advance
> > > at high RPM.
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