The Venturi effect is the reduction in air pressure and therefore the increase in air velocity when filtered air flows through the throat section of a simple carburetor. The reduction in air pressure and therefore the increase in air velocity in the throat section of a carburetor is limited by the choked flow condition at Mach number unity. A fuel nozzle is placed in an appropriate location in the throat section to atomize the incoming fuel and mix it with air. A float in a stored fuel chamber adjusts the fuel level with respect to the throat location. Upstream of...