FUEL-AIR MIXER FOR CARBURETORS

TITLE: FUEL-AIR MIXER FOR CARBURETORS A fuel-air mixing improvement for the carburetor of an internal combustion engine breaks droplets of fuel progressively into finer droplets as they pass through the fuel "jet" or supply tube between the fuel reservoir and the carburetor induction tube. A twisted wire mesh screen is mounted within the supply tube. The twists increase in pitch from an upstream end to the discharge of the tube so that fuel droplets and air being pulled through the screen are progressively more frequently engaged by the screen and the droplets are thereby broken into finer droplets, resulting in an extremely fine spray. This is accomplished before this rich fuel and air mixture enters into the air passing through the carburetor induction tube. The rich mixture then leaving the supply tube has already developed a swirling path and readily mixes with the air being drawn through the induction tube and venturi. To assure that the wire mesh screen will not overly obstruct the fuel and air passage through the supply tube, a tapered ring is mounted to the venturi for guiding or restricting air flow to a path primarily through the venturi rather than through the open space between the venturi and remainder of the induction tube. Also, for adjustment purposes an air-bleed mechanism is provided whereby air may be taken upstream of the venturi and directed into the associated fuel reservoir adjacent the intake end of the fuel supply tube. Adjustment is provided with this arrangement such that air may be bled selectively into the area to be premixed with the fuel prior to its reception and passage through the spiral screen within the fuel supply tube.