[T3] Dual Carb Shift Vacuum
Jim Adney
jadney at vwtype3.org
Wed May 7 09:42:42 PDT 2014
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.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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