http://www.teglerizer.com/mgstuff/a_stumble_at_cruise.htm
explains a two year long adventure I undertook answering
that very question! Complete with a trail of emails pertinent
to the final resolution. The particular vac curve is matched
to the cam and the vacuum type. (IE ported or direct manifold)
Different units deliver different advances under different
vacuum levels. See the list at
http://www.teglerizer.com/mgstuff/SUcarbs.htm
for a comparison of the vac curves.
Paul Tegler
wizardz@toad.net
www.teglerizer.com
----- Original Message -----
From: "Carl French" <leylandauto@yahoo.com>
To: "mg list" <mgs@autox.team.net>; "MG-MGB" <MG-MGB@yahoogroups.com>
Sent: Thursday, August 22, 2002 5:46 PM
Subject: [MG-MGB] 25D4 vac advance
>
> How specific is the fitment of different vac advance units all made for
25D4s? How specific are different 25D4s for that matter? There are so many
numbers with some Moss numbers and some Lucas numbers.
>
> Carl
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