I posted this a few weeks ago and have an update.
Thanks for your input Paul.
I have now adjusted the carbs and fixed a couple
of vacuum leaks. I took it out for a run on Sunday.
<BIG GRIN> It is running GREAT with the old
distributer and no vacuum advance.
I think I'll leave the distributer alone for a while.
I'm still planning to put a mallory in it in the fall.
This was my first time out with it and I loved
all the waves, thumbs up, and smiles I got from
people as I was driving around. On the other hand
most of them could have been because it was
10 degrees outside and I was in a full
snowmobile suit with the top down.
"Hey mom, look at that fool!" :-)
My Defense:
Well, the roads were dry, I live in
Minnesota, and I had to get one fix
before the next winter storm
comes through. I can't wait for
spring and the autocross season
to start.
Brent Schwartz wrote:
> 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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