Hey Loren,
I'm not sure what you mean by
"If you still have your manometer, you can make an adapter to change it from
side draft to downdraft."
The way my manometor works is it attaches to the vacuum ports on the carb.
Thanks
George
-------------- Original message --------------
If you still have your manometer, you can make an adapter to change it from
side draft to downdraft. I am not sure about the bore size vs, the range of
the manometer, but you could take a stab at it with pvc pipe fitings, and see
what it does.
you learn to tune by ear by starting with an instrument, then making small
adjustments and listening carefully for how the engine responds. It is an art
form and is learned but seldom taught. the best way to learn is to dig in and
start tuning.
Anybody else want to help out?
Generically: (may differ from the book method)
I'd start with the idle mix
Then idle speed
then throttle linkage adjustment
then back barrel adjustment
then choke adjustment
then you usually need to start over to double check/tweak as there are
interactions
your method may vary. find what works for you If you like the book procedure,
use it. I admit to being old school, and I have seen some real artists. I
have tried to learn from them. As a result, I only consult the book if I am
stumped. And I avoid carbs like the plague. My brother is an artist with
hollys. I am not.
At 08:57 AM 8/3/2005, you wrote:
Thanks Loren and all who responded.
The only other carburator tuning I have done was on a Kawasaki KZ-1100 that had
4 mikumi carburators. I used a manometer for that. That is a percision tool for
dialing in carburators.
I've been told I can't use them on these carbs.
So how does one tune them by ear?
Thanks
George
-------------- Original message --------------
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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From: Loren Faeth <[EMAIL PROTECTED]>
To: Mercedes mailing list <[EMAIL PROTECTED]>
Subject: Re: [MBZ] Syncing carbs
Date: Tue, 2 Aug 2005 23:40:09 +0000
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