In other words you MUST install VERY lean jets to begin with  and
   then let this device
   increase the fuel flow to the desired mixture. It is sort of leaning
   in reverse.
   I suspect it won't work with a Weber as I understand it a Weber
   already has
   an emulsifier tube. Larry Childs or Bill Jepson knows more about
   these things so perhaps
   they can confirm this for me.

   IMHO this device senses dynamic pressure ahead of the throttle and
   feeds a controlled amount of
   the air into the bottom of the tube after the main jet allowing the
   venturi to suck more
   fuel using the principle shown in the illustration. I am also not
   sure it will
   work with a diaphragm type carb.

   Paul Lamar ...No rotor no motor.

Paul,
You are correct in your assumption that the jets would have to be at
their leanest operational size for the dial-a-jet to work.
The Weber emulsion tube and jets are a careful "tipover" system to
control how the system changes mixture mostly in a mid range for both
power (based on throttle opening) and RPM. The combination of the main
jet and air corrector changes the throttle opening at which the system
becomes effective. The real problem here is the definition of the
device. Weber calls it an emulsion tube, others might call it a
mid-range jet tube.

I also believe you are correct in your statement about how the D-A-J is
working. I might add that I believe that the system needs a float bowl
to draw from to get the correct "head height" with respect to it's
sensor. Since the diaphragm carb has no float bowl the D-A-J would need
a remote float bowl at the correct potential energy state to work. This
while possible, would negate the any position functionality of the
diaphragm carb. That would make it impractable on anything but a float
bowl type carburetor.
Bill Jepson


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