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 and plugged "carburetor synchronizer"
into their
> > search window.
> >
> >
> >
> > They came up with a product ZX882792N for about 24 bucks.
>
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