2 6 3 is a strange one, much less than all bar one I have listed for the
MGB, and hardly seems worth the bother. The capsules are interchangeable so
any old capsule could have been put on either dizzie at some time in the
past. Also rebuilders are not always fussy about which case they use as a
donor - or which parts they use inside IME.
An NA 1974 CB with HIFs should have an 18V 672 or 673 which should have a
41491. 41692 or 41693 are pretty close centrifugally but have more vacuum -
could get pinking on light-throttle acceleration. 41600 also but has no
vacuum. 41695 has less vacuum - possibly poorer cruising economy.
----- Original Message -----
From: "Ken Waringa" <kwaringa@dynsys.com>
To: "ptegler@cablespeed" <ptegler@cablespeed.com>; "Dodd, Kelvin"
<doddk@mossmotors.com>; "MG" <mgs@autox.team.net>
Sent: Thursday, January 31, 2002 12:53 PM
Subject: RE: Distributor choices - marking locations
> Last night I had a chance to clean both vacuum advances looking for
numbers.
> The vacuum advance that came off the distributor with the 10 degree
> centrifugal advance had the following numbers: 10 15 5; 54425359. The
> advance from the distributor with 16 degree centrifugal advance had: 2 6
3;
> 54415328.
>
> Now. Looking at these numbers and studying Paul's advance chart it seems
> that the 10 degree dizzy has much more vacuum advance at lower engine
rpms.
> The 16 degree dizzy will have significantly less advance at idle and
relies
> more on the centrifugal advance than on the vacuum advance.
>
> Both vacuum advances are shot and will need to be replaced. Kelvin,
looking
> at the Moss catalog they only list one vacuum advance for each distributor
> type, but I have 2 different 25D4, 40987 distributors. Do you have a
> listing of the vacuum advance numbers that are available?
>
> And back to my original question, which distributor will be best for a
> stock, street driven early 1974 MGB engine with stock HIF carbs? Will it
> make any difference which one I use?
///
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