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Carb Sync/balancing with standard Vacuum Gauge?

  • Thread starter Thread starter evh
  • Start date Start date
E

evh

Guest
Has anybody every tried balancing their carbs one at a time with a standard vacuum gauge? I'm just wondering if this has been done before? You would have to go through each cylinder 1 at a time and adjust the carb to the desired manifold vacuum.
 
This is what I use...

vacuumgauge005.jpg



Works well on VM's. A bit more difficult when used on BS series carbs until you get the hang of it.
 
Only problem is when you adjust one carb it also changes the reading on the rest of them.
 
Since there is no "standard" vacuum, that would be hard to do.

The idea is to get all four to read the same, whatever it is.

As OLDENUFF said, you make one adjustment, it affects all four.

Your best bet would be to take advantage of the Dollar/Pound relationship right now and get the Morgan Carbtune.
Splurge, spend a couple extra bucks and get it complete with carrying case.
At today's rate, that's $101.65 for the package.
Sorry, just noticed your location, that's for US$. That would be CA$100.77.

.
 
Last edited:
Hi,

I agree, yes, it is possible but very inconvenient. The Morgan Carbtune is the best tool for the job. You can use a rack of 4 manual gauges, something like this...

DSC05601.jpg


... but you have to be sure and calibrate them all before you use them. The Morgan Carbtune is calibrated at the manufacturer.


Thank you for your indulgence,

BassCliff
 
I just received a new Morgan and the quality is horrible not sure I would ever buy another. All the intake fittings are plastic and snap off. The lines will not stay on the fittings either. It is a piece of crap.
 
Hi,

I agree, the plastic fittings that come with the Morgan Carbtune are small and very inconvenient to use. That's why I bought a vacuum sync adapter kit from Z1Enterprises.



The Carbtune instrument itself is wonderful. I don't know why they ship it with such cheap plastic vacuum port connectors.


Thank you for your indulgence,

BassCliff
 
BassCliff said:
Hi,

I agree, yes, it is possible but very inconvenient. The Morgan Carbtune is the best tool for the job. You can use a rack of 4 manual gauges, something like this...

DSC05601.jpg


... but you have to be sure and calibrate them all before you use them. The Morgan Carbtune is calibrated at the manufacturer.


Thank you for your indulgence,

BassCliff
Click to expand...
This is the set I have been using for a year. They seem to work fine. I did not know they needed calibrated. Where can I find the calibration method?
 
Hi,

nejeff said:
This is the set I have been using for a year. They seem to work fine. I did not know they needed calibrated. Where can I find the calibration method?
Click to expand...

Hook up each gauge individually, one at a time, to the same cylinder. Make sure each gauge reads the same vacuum level. I'm not sure if those particular gauges have any adjustment.



Thank you for your indulgence,

BassCliff
 
nejeff said:
This is the set I have been using for a year. They seem to work fine. I did not know they needed calibrated. Where can I find the calibration method?
Click to expand...

BassCliff said:
Hook up each gauge individually, one at a time, to the same cylinder. Make sure each gauge reads the same vacuum level. I'm not sure if those particular gauges have any adjustment.
Click to expand...
Even better, go to the aquarium section of the pet store, get a 4-gang air manifold so you can connect them all to the same source at the same time.

Once they all agree with each other, you will know that any differences that you see are due to different vacuum levels.

.
 
BassCliff said:
Hi,



Hook up each gauge individually, one at a time, to the same cylinder. Make sure each gauge reads the same vacuum level. I'm not sure if those particular gauges have any adjustment.



Thank you for your indulgence,

BassCliff
Click to expand...

Thanks, will do that
 
Steve said:
Even better, go to the aquarium section of the pet store, get a 4-gang air manifold so you can connect them all to the same source at the same time.

Once they all agree with each other, you will know that any differences that you see are due to different vacuum levels.

.
Click to expand...

Also a good tip. A trip to the fish store is in my future anyway
 
Take a look at rustybronco's setup in post #2, just turn it around so it's one source and four gauges.

.
 
http://www.amazon.co.uk/

I got my 12mm colortune for 41$ US delivered.
I'd bet they have a carbtune as well!!!
And yes the 4 gauge set has a calibration screw under the cover- unscrew it and make the adjustment.
 
thanks for the replies.. I figured I'd ask just for the heck of it.. I'll just get a ready made carb sync kit and be done with it.. It's something that will come in handy for tuning other people's bikes.
 
I have the same set BassCliff outlined and I calibrated them using a MityVac vacuum bleeder. One at a time, just set each gauge to the same reading on the mityvac.
 
1980GS1000E said:
I have the same set BassCliff outlined and I calibrated them using a MityVac vacuum bleeder. One at a time, just set each gauge to the same reading on the mityvac.
Click to expand...
That can work, too. :clap: :clap:

Doesn't really matter if the MityVac gauge is accurate or not, you are using it as the same reference for all the others, which is all that really matters.
icon_thumbsup.gif


.
 
Please explain the mityvac method.I do mine on the bike with the good old U tube,but then I have a twin.
 
Just connect the MityVac to one of the gauges and pull some vacuum. Note where the first gauge sits at 10 inches indicated on the Mity Vac. Then connect each one, one at a time, to the MityVac and pull that same 10 inch reading. Set each gauge to the same reading that was indicated by the first gauge.
 
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