Early cars used carb-ported vacuum - the port is on the rear carb, typically
on top of the throat between the dashpot and the flange where it is bolted
to the manifold. Later cars used manifold vacuum. Just connect the vacuum
capsule on the distributor to whichever port you have. All distributors
should be stamped or labelled with a serial number (in the range 40897 to
41695) as well as the type (25D4 for early, 45D4 later, 45DE4 or 45DM4
last).
Engines, carbs and distributors were specced in sets. If you get a wrong
mix you could experience problems in performance or economy.
PaulH.
http://freespace.virgin.net/paul.hunt1/
-----Original Message-----
From: dresden@tiac.net <dresden@tiac.net>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: 24 March 1999 01:28
Subject: SU's draw blood but I win; a couple questions
>A question: I remember that there is some difference between vacuum
>advance/retard, etc, between the early and later model cars. All I know
>about the distributor currently in my '78 B is that it is not original, it
>is an earlier Lucas model which uses points. How do I get a more definite
>ID on it, and how does the vacuum stuff go together? Is it just manifold to
>vacuum unit? My misplaced Moss catalog would be handy right now; I've
>searched the Haynes for a solution but can't find much.
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