Manometer home made

[GL15Brewer]

So I followed Big Wolfs design for a manometer and its looking good. Had a question though. I only have about 10 ft of 3/16id tubing to the valk and I just keep sucking tranny fluid into the overflow reservoir. How much line do I need.? Will adding line from the bike to the manometer decrease the pull so it doesnt just overflow? (Physics say yes) how much do others use? His says 18ft?  Thanks again.

[yrunvs]

Not sure of your design but could you pinch off the lines some to restrict turbulence?

[Grandpot]

Is this a 6 station manometer using automatic transmission fluid.?  Can you send a picture? Need more data.

[GL15Brewer]

It's like this one.
http://www.valkyrieforum.com/bbs/index.php/topic,38812.0.html
I think I may have an air leak in the system. Or I need to put dampers in line cause I'm just sucking transmission up into the collection reservoirs. Cant get a read cause it's just pulling it all up.

[pancho]

Wow,, The one Bigwolf designed is quite an elaborate piece of engineering.  I built this simple one years ago using ATF, it works just fine. It will draw about 30 inches of ATF through all six tubes with the size of reservoir I used,, the reservoir must be full to the brim with ATF before sealing. Mine will start to draw ATF into the intakes if all six tubes are not connected, (air leak) or if I have gotten an air pocket in the top of the reservoir and it cannot build enough vacuum.    With your design these parameters may be quite different.

[Grandpot]

The slightest air leak will allow the fluid to be drawn into the carburetors.

[Bigwolf]

It's like this one.
http://www.valkyrieforum.com/bbs/index.php/topic,38812.0.html
I think I may have an air leak in the system. Or I need to put dampers in line cause I'm just sucking transmission up into the collection reservoirs. Cant get a read cause it's just pulling it all up.

Brewer,
 The attenuators (collection reservoirs) serve 2 purposes.  First, they dampen the pulse so that it is not jumping too wildly for you to read.  I like this method of dampening better than pinch clamps because it is easier to have all 6 attenuators creating equal dampening.  Just a slight bump to a pinch clamp can seriously change it’s dampening effect.  Secondly, each attenuator on my setup is capable of holding ALL of the fluid in my entire system thereby trapping the fluid and ensuring that it can never reach a carburetor.

To answer your question about length of tubing: longer tubing will of course create more dampening.  Other than that, and the necessity to keep all tubing and piping equall in length, I don’t believe the length is important.

This system is very sensitive!  If you have even a small leak in connection to one of the carbs or if your carbs are very far out of balance, it will suck all of the fluid out of the reservoir and toward the carb with most vacuum.  I believe that it is best to balance them by some other method first and then fine tune them with this setup.  I have gotten close enough when I take my time to bench balance the carbs after a rebuild, however, if I get in a hurry on the bench when rebuilding them, I end up with the same problem that you are experiencing.  Then I have to put a regular vacuum gauge to work so I can get close enough to use this setup.

I made this setup so long ago that I had forgotten that I ever did a write up and posted it.


Bigwolf

[GL15Brewer]

Alright so I used pvc cement to glue all the vinyl tubing to the PVC and bought clamps for the tubes to the intake nipples. Was gonna warm it up and test it. Battery was dead     hooked to the trickle charger for a bit then I'll try again. Think I'm gonna try adding restrictor in line as well.