Throttle body Sync- Vacuum Guages or Manometer

[howardrichman]

So do i just junk my old Mercury sync tool? How much different would it be as the homemade stick ruler sync tool useing colored water? The problem w/ the newer model Motion Pro unit, if not used enough, I'de be buying sync fluid every time of use from infrequent using the tool; from evaporation.

                                                                                                                                              Howie...

I made a sync tool using a 3' ruler and some 1/4" clear hose. It sort of worked. I used 2 cycle oil as recomended, and was tricky to ballance. The oil moves slow, and isn't stable. Maybey I should have diluted w/kerosine. it's very close, and will be much better than where I was.  I'll probably wait for a 4 cylinder Harmonizer to buy when made sometime soon.

                                                                                                                                                                                                                                 Howie...    

[02Tac]

Again; my question is: should'nt the Standard spec vacuum be set on one port to use for the remaining others before any throttle body syncing is done for initial vacuuum accuracy? If so, multiple accurate vacuum guages, digital version sync tools ,or a separate vac guage used w/ a manometer should be the choices for syncing.

                                                                                                                                   Howie...

The actual reading on the nmstrument is not a concern. Take a reading on 3 different days any you will get 3 different measurementas as temp and baro pressure have a direct effect.  The important thing is that you get all the carbs pulling similarly, "synced". They do not even have to be "exactly" even with each other, a small variation (usually listed in your manual) is acceptable. I usually get mine to within one graduation of each other.

Me, I have a Morgan Carbtune and find it to be a very nice tool. Same principle as the mercury filled tubes, but with stainless slides instead of fluid so there are no worries about sucking crab into the motor.
http://www.carbtune.com/

[JJones-lg]

I built a flow bench a few years back. I built and used monometers and measured in inches of water. The length of the tubes for water is pretty long for the vacuum in a manifold but there are such things out there.  The reason for mercury is that the weight of the fluid makes for a smaller and more manageable instrument.  If you change fluid from mercury the reading range changes and may be out of the range of the tool.   Measurement in inches of water is more precise than inches of mercury which is why flow benches measure in water.    
Looking at the stuff posted her I really like the Carbtune.  


jj  

[howardrichman]

I built a flow bench a few years back. I built and used monometers and measured in inches of water. The length of the tubes for water is pretty long for the vacuum in a manifold but there are such things out there.  The reason for mercury is that the weight of the fluid makes for a smaller and more manageable instrument.  If you change fluid from mercury the reading range changes and may be out of the range of the tool.   Measurement in inches of water is more precise than inches of mercury which is why flow benches measure in water.    
Looking at the stuff posted her I really like the Carbtune.  


jj  

07 650R Ninja
Well; I was trying to choose between the Morgan Carbtune, and the Harmonizer. I like the benefit of the Carbtune being able to tune in and see all 4 cylinders at the same time, but the Harmonizer has many raves on ADV. Rider; and displays RPM's and Vacuum. It's downside is only two cylinders vacuum can be set unless using a manifold or swapping lines. The designer is working on a 4 cylinder model at this time.

                                                                                                                           Howie...