Ken

I mis understood what you were doing. I stand corrected.
Do I have it right know? Lower pressure in the float bowl leans the mixture?
Higher static pressure in the venturi also leans the mixture?

I'll have to rethink this scheme. Perhaps we need an external low pressure to
supply a lower controllable pressure for the float bowl.

I think what they are doing with the Dial A Jet is set up the carb with
a full lean jet to begin with and add air to the fuel and pressure to the float
bowl with the Dial A Jet as required.


Paul Lamar ...No rotor no motor.

Paul,
What is really happening with is not the change in float level. I can change
the float level by a large increment and not effect mixture. What is
happening is changing the pressure on the fuel in relation to the metering
signal. Decreasing the atmospheric pressure to a lower value leans the
mixture. Adding dynamic pressure would have the effect of making the mixture
richer. You need to lean the mixture by putting a partial vacuum on the
float bowl. The float level will remain the same as the float is driven by
gravity (it's specific gravity is less than the fuel).
Larry

Thanks Larry for straightening me out on that.
-- 
Paul Lamar ...No rotor no motor.

Larry,
I'm playing with my own design ideas ( slide carb) and one of the variables
is an adjustable ( in height via screw thread) needle to lean and richen the
mixture and the other problem of different seat jets sizes, I feel  could be
solved with a variable pressure fuel pump ( from 1.5 psi +). This could be
managed with an idle jet under the jet/seat.

I envisage the variable pressure pump an idle screw as the course
adjustment, with the needle ( into seat/jet) as the fine adjustment.
What do you think.
George ( down under)


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