ORIGINAL: cymaz
My post 3269 on this thread show the 7 cyl gas radial 41cc that my mate has lent me to put to good use. However there seems to be a fuel starvation problem at 3/4 to WOT. The carb that is on it now is of unknow make with a venturi bore of 3/16" - thats about 1/4 of one cyl bore diameter.
What webro carb or similar might to the job better??
The venturi size for that size engine (7-6cc cylinders) is about midrange to slightly high - depending upon the rpm you are trying to hit. Do you have a way to deliver the fuel under pressure to the carb? The actual venturi design can increase/decrease the vacuum available to pull the fuel from the tank as well. The smallest venturi I would recommend would be .140" (3.5mm) but I'm not sure the fuel draw will necessarily improve, and youmight draw down the power available.
Pete