I did a little homework last night and found that
I have the early distributer (40897) with a screw
vacuum connecter on the advance unit. It appears to
be rigged for port vacuum off the carb. The vac
advance unit seems to be working... However,
My engine is a 18GK definetly set up to have a
manifold vacuum distributer... ie no carb ports
to connect it to.
I am not sure I trust Moss
or Victoria British on this. Does anyone
have suggestions on a supplier where I
can find a distributer with the correct
timing curve and vacuum advance unit
to go with my manifold vacuum connection.
I am considering two options: Mallory Dual
Point, or trying to get a 41339 distributer that
matches the 18GK engine according to
Paul's list. My primary concern here is
cost vs utility. If I can get the Stock distributer
for considerably less than the Mallory
then I will go that route. Otherwise If
the cost is nearly the same I will probably go
with the Mallory.
Thanks for your help!
P.S. The car is definately NOT origional so I am
not in the least worried about being "Correct"
I just want it to run good when I take it to the
Autocross this summer.
Ptegler wrote:
> Ha! vacuum lines hee he hee...
> I think I can answer this one very safely. he he
>
> The late model B's used 'manifold' vacuum.
> That is to say... the tap for the dist. vac. unit came
> directly from a port on top of the intake manifold.
> BE VERY CAREFUL which vacuum advance unit you use
> with which vacuum source you use. (manifold or carb tap)
> as well as matching it to the mechanical advance
> within the distributor. The different vac. adv. units have
> different curves, designed to come in at different levels
> of vacuum with different amounts of advance.
> check out
> www.teglerizer.com/mgstuff/advance_curves.htm
> for details as to what goes with what.
> Ignore the years (model) and what you think it should be.
> If you work with what you have and hook it up accordingly
> everything will work just fine (if the combo is compatible)
>
> BTDT ...two years chasing that one down!
>
> Good Luck
>
> Paul Tegler ptegler@gouldfo.com www.teglerizer.com
>
> ----- Original Message -----
> From: "Brent Schwartz" <bschwar@uswest.net>
> To: "MG Mailing List" <mgs@autox.team.net>
> Sent: Tuesday, February 06, 2001 4:29 PM
> Subject: Technical Question
>
> I have searched the web and the repair manuals fairly dilligently
> and can't find the answer to this one.
>
> Background:
> --------
> 1. Body 1977 MGB Roadster
> 2. Engine from a 71.
> 3. Someone in the past obviously played "Mix-n-Match" with parts to get
> the car running.
> 4. SU HS4 Carbs with PCV ports on the top rear outside corner of the
> body.
> 5. No Vacuume advance port on the top center of the body on the rear
> carb.
> 6. I found one picture of an engine that looked similar with the EGR
> and Vac hose but it
> shows the hookup going to the top of the rear carb into a port that
> doesn't exist on my
> system.
>
> Question:
> ------
> Where does the vacuume line for the distributer vacuume advance hook up?
>
> Thanks
> Brent
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