Sounds like you need to build an adapter and put a Holley 4 barrel own
nat thang. Them is goooood carbs!
--R
Loren Faeth wrote:
First off, you need to know my perspective. I am a dieseler, and I
despise carbs, especially dual zeniths. From my experience, if you
have not synched carbs before, a unisynch or similar vacuum gauge is
helpful, but not the end-all. It can help you get close, unless you
happen to have a brand that is really sensitive. The adapters
provided will not work. You will have to make an adapter to fit over
the carb that the synch tool will fir over or in the end of. PVC
pipe, fittings, and some glue and a hacksaw come to mind. You want to
prevent any air leakage between the carb and the synch tool. THe
synch tool will get you close, but in my experience, the fine tuning
is done by ear.
THe problems with Zeniths is that they can rarely be made to run well
at speed, and idle well at the right idle speed. Most of this is from
the tops warping. The usual compromise is an idle speed that is too
fast. THe older dual solex were better, but not great.
I think you could make a synch tool with a necked-down bore above the
carb with a 1/8 tube out the side to a good vacuum gauge. I think
this would be better than the tools sold, because most have only 30-45
degrees of travel. My unisynch was not sensitive enough for most
work. the only thing I can't tell you is what the optimal diameter
would be to coincide with the range of a typical vacuum gauge. You
could study the gas laws and make a pretty good estimate.
http://staff.jccc.net/wkoch/Physics%20130/Notes/Fluids/chapter_11_fluids.htm
Tuning dual carb BMWs, i have not used a synch tool for years. Just
do it by ear.
dive in and start tweaking, just realize the weakness of the design
you are working with. Perfection might be very costly.
At 04:29 PM 8/2/2005, you wrote:
I have one of those.
But it does not exactly fit over the carb throat. THe book shows a
kind of bowl that sits on top.
I'm not sure the unisys would work because the throat of the carb is
not the highest point.
-------------- Original message --------------
> Looks like it might be an improvement over the old UniSyn anyway.
>
> joe
>
> On 8/2/05, Gerald R. Flintrop wrote:
> >
> >
> >
> > I went to www.jcwhitney.com <http://www.jcwhitney.com/> and
plugged "carburetor synchronizer" into their
> > search window.
> >
> >
> >
> > They came up with a product ZX882792N for about 24 bucks.
>
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