[T3] Dual Carb Shift Vacuum

[Craigs List]

Reverse is fine. Third is great. It is just the shifting from second to
third that sucks.
On May 15, 2014 9:44 PM, "Tony Rongey" <trongey at sbcglobal.net> wrote:

>
>
> Adam,
> I might have missed this somewhere in the long thread, but does the car
> shift into reverse OK?
> If not then most likely your direct/reverse clutch is shot since it does
> both 3rd and reverse.  I've been through 3 automatics that all had that
> same problem after they had set for 20 or 30 years.  The rubber seals in
> that clutch seem to be especially prone to drying out if the car sits for
> too long.
>
>
> Tony
> '70 Fastback AT/FI
>
>
> ________________________________
>  From: Craigs List <craigslistcsprings at gmail.com>
> To: type3 at vwtype3.org
> Sent: Wednesday, May 14, 2014 7:46 PM
> Subject: Re: [T3] Dual Carb Shift Vacuum
>
>
> Guys,
>
> I have a little bit of an update. I decided to dive into drilling and
> tapping all 4 manifold ports today. After work I got the passenger side
> manifold drilled and tapped. I will finish the drivers' side manifold
> sometime next week. I have few plans over the next few days that will keep
> me from finishing.
>
> I went on a test drive with just the one manifold ported with BOTH
> cylinders tapped. You  can tell that it has helped quite a bit. With the
> erratic vacuum signal that I was getting with only the one cylinder tapped,
> it would downshift hard when you were coming to a stop. Just porting the
> second cylinder on that side has taken that away. It rolls to a stop and
> downshifts like it should. It is almost unnoticeable.
>
> It sill does not want to shift into third, but it does shift a lot smother.
> I can't wait to get the other side tapped and a balance tube ran. I am
> happy with what it did so far. I will let the pictures do the talking.
>
> In this first picture, you can get a feel for what I wanted to do. I could
> not think of a way to get this to work,.
>
> http://one4house.com/images/manifold6.jpg
>
> Because of room constraints and such, I decided to go with the setup you
> see below. It ended up working out great.
>
> http://one4house.com/images/manifold1.jpg
>
> http://one4house.com/images/manifold2.jpg
>
> These last 3 pictures are the manifold bolted into place before I put the
> carb back on.
>
> http://one4house.com/images/manifold3.jpg
>
> http://one4house.com/images/manifold4.jpg
>
> http://one4house.com/images/manifold5.jpg
>
> I will post some more pictures next week when I get the other side done.
>
> Adam
>
>
> On Wed, May 7, 2014 at 10:42 AM, Jim Adney <jadney at vwtype3.org> wrote:
>
> > On 7 May 2014 at 8:37, Craigs List wrote:
> >
> > > The only thing that scares me about this is that I had a balance tube
> > > between the two manifolds when I had the 34 ICT's. I had this same
> issue
> > > with those carbs. and not wanting to shift.
> >
> > I have no idea if this will actually cure your  problem. Once you get
> > off the beaten path, you're either on your own, or you're looking for
> > someone who has already blazed this particular trail for you. What I
> > can be sure of is that this should give you a better vacuum signal
> > (more pulses per engine cycle and lower average vacuum.)
> >
> > > I am more than willing to put a vacuum port on all 4 barrels. I am just
> > not
> > > convinced that it will make that much of a difference. Here is a
> picture
> > of
> > > the setup I had before.
> > >
> > > http://images.thesamba.com/vw/gallery/pix/1127904.jpg
> >
> > Those hose sizes look fine. Note that the OE AT engine breastplate
> > has a cutout at the bottom so that the VM hose can go straight down
> > toward the VM. That shortens the hose, which should speed up the
> > response time slightly.
> >
> > You also want the vacuum ports in the manifolds to be nearly as large
> > as the hose ID. If they are small, that will slow down the response
> > time.
> >
> > --
> > *******************************
> > Jim Adney, jadney at vwtype3.org
> > Madison, Wisconsin, USA
> > *******************************
> >
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> >
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