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Heres an better explanation Mark
I control my mixture on my Weber with an air ram, the two ram tubes are set about an inch away from the velocity stacks and the float bole vent is to the side and below the stacks so when the ram is opened it changes the pressure difference between the float bole and the Venturi thus leaning out the fuel mixture.
In cruise I can open the ram until the rpm peaks and then when it drops I know that I am on the lean side of peak and the close it until it peaks again for the best power.
Also note that my plane only cruises at about 100 mph so you guys with a faster plane will get more ram effect and more leaning effect, on my plane the leaning lever is wide open at 16,000 ft
I am also going to play with an air bleed system that is used on snowmobiles that uses Venturi vacuum to change the float bole pressure.
Ken
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