TB balancing options/questions

[rodekyll]

If you use one U shaped tube you get perfect balance, too -- without any math, noxious fluids, barometer, or calibration.

I understand what you're saying about mercury.  I don't see how any of it relates to finding zero.  Even columns are even regardless of the scale you use.

[Kiwi_Roy]

1 inch of mercury = 13.5951 inches of water.  This means that a mercury gauge can indicate a 1/2 inch difference if compared to a gauge with a low specific gravity fluid (SG) such as colored water, which could be over 6 inches difference. 

Also, the pulsing of the intake  will cause the cavitation or bubbling in the lower SG fluids.  Vacuum gauges with a diaphragm and flow control is the best set up.  Clean and safe. 

If you were to make a setup with low SG shop fluids and get a fluid level at each tube withing 6 inches while connected to the running bike, I would say you are extremely close to balanced.

Yes

Yes, I have seen my oil sort of bubbling at the surface on occasions, but they still work

I don't agree that bourdon tube gauges are better, certainly a lot more expensive but fragile.
In the petrochemical plants we build we pad the tanks to 1 kPa ~ 4" WC, the gauges as good as we can find are useless, too fragile and too much error, I showed the operators how to set the regulator using a length of plastic tube with water in a pop bottle, deadly accurate.

Yes, better than 6" is very accurate but you can get 3" quite easily

[Testarossa]

https://www.ebay.com/itm/Carburetor-Synchronizer-For-Dual-Carb-2-Cylinder-Engines-Motorcycle-Carb-Sync/152150518062?epid=1332533225&hash=item236ce0a92e:g:7EIAAOxyVLNSzuo4&vxp=mtr

No mercury, no fluids at all to get sucked into the engine or your lungs.  Works great. If you worry about the gauges not being equal, just swap sides and repeat.

Also available in set of four.

[Kiwi_Roy]

If that's what turns your crank I don't think anyone is saying not to use gauges, I pointed out they are fragile.
Zero, span and linearity are all adjustable, sometimes suffer from hysteresis, vibration can rattle them to bits.
Glass to get broken, plastic in this case, still may need damping.

My Kawasaki riding buddy has a set of 4 but they look better quality than those.

Note the units on the scale, all liquid head as in manometers
They don't measure pressure difference, our "U" tube manometers do, directly and more accurately.
You can't amaze your friends with those like your home built manometer LOL
When you need to calibrate your low range gauges they historically would have been compared against a mercury manometer.


Is that what you use?

[spreadeagle]

Rodekyll,
Thank you for the instructions for making a manometer ,  Will this work for checking a 2002 special sport?
I have been holding off taking it 2-3 hrs to dealer.  Is it really that simple.  I think  the valves should be checked prior I have done this before?  What about TPS ?  Check this after balance?

My bike runs very good 65 degrees and lower.  The hotter it gets after that the more it likes to do the guzzi farting /popping  at lower rpms.  I am trying to figure out if I can defeat this without taking to a shop,  I am on fixed income like some  other suspender wearers!  Any other ideas are greatly
 appreciated.

Peace

[rodekyll]

Yes, it's just that simple to make.  You don't even need the yardstick.  I put it in to help me more easily see where the columns top out.

There's a procedure for setting up the TBs.  Read up on that (use search) before getting into it.  Yes, if this is not a hydro, adjust valves first.  Also check your plug gaps and air filter.  Since you're talking about popping, also check your exhaust joints for leaks and cracks.  Then go about checking the efi stuff.  If you don't have guzzidiag, get the program and the cable.  It will tell you a lot about the state of your injection system.

[Wayne Orwig]

Rodekyll,
Thank you for the instructions for making a manometer ,  Will this work for checking a 2002 special sport?
I have been holding off taking it 2-3 hrs to dealer.  Is it really that simple.  I think  the valves should be checked prior I have done this before?  What about TPS ?  Check this after balance?

My bike runs very good 65 degrees and lower.  The hotter it gets after that the more it likes to do the guzzi farting /popping  at lower rpms.  I am trying to figure out if I can defeat this without taking to a shop,  I am on fixed income like some  other suspender wearers!  Any other ideas are greatly
 appreciated.

Peace

The mixture is leaned by the computer as the engine heats up. If the TPS is lean also, you may be going too lean.
Valve adjust
Balance.
Set TPS


Sent from my SM-N950U using Tapatalk

[Kiwi_Roy]

A couple of minor points.
You will be looking for some 6mm nipples to screw into the manifold, 6 mm grease zerts make a good substitute but first you need to file the tip off the threaded end letting out the spring and ball.
If you slide the plastic tube onto the nipples as the engine heats up the tube gets real soft and falls off. something like a short piece of rubber hose or heat shrink tube will fix that.
Fix a short metal strap with a couplele of woodscrews to squeeze the tube at the bottom of the U, this will act as an adjustable damper.

[Kiwi_Roy]

I'm surprised no-one bought up the two glass jars with the syphon in between, I always wanted to try one of those just never got around toit.
 

If you only use half a jar total of liquid it should be impossible for the motor to ingest.
You would have to initiate the syphoning by opening the full jar to atmosphere.

Here's another idea you used to see in old pneumatic instruments used for balancing signals.
The ball will roll up the curved tube in the direction of lowest pressure, at balance it stops in the middle.

[Waltr]

So after two pages of discussion diversion the answer to the original question is "NO".  At least I found out how my Carbtune works.  But in the words of my previous Mgr. "Understanding is the Booby Prize in Life."

[tris]

To be honest Waltr the "mission creep" of many threads on this forum  amuse me 

Life is too short to get stressed over whether my Carbmate is dead 

Still it has made me think if there is a way to hook up my old dial gauges as a comparison

Cheers Everyone

[ohiorider]

Morgan Carbtune. Inexpensive. Clean. Accurate. Robust. Safe.

I've used fluid manometers for years, but I do like the two column Morgan Carb Tune well enough I may buy my own.  Been borrowing Markcarovilli's the last two times I balanced R100GS's carbs.  Works nicely ...... compact and NO fluid.

Bob