Abstract: A method and apparatus for uniformly distributing fuel into the cylinders of an internal combustion engine by introducing fuel into a variable area, sonic flow, convergent-divergent nozzle type carburetor at a location below the throat in close proximity to the shock wave and always within a narrow width axially extending zone that during sonic flow engine conditions in the passage provides good fuel spray characteristics without flow separation from the walls of the passage regardless of the changes in manifold vacuum level or flow area of the nozzle.

Abstract: A carburetor has an induction passage, a fuel circuit and a choke valve positioned at the inlet of the induction passage. A metering rod extends transversely of the induction passage and has a variable diameter end portion projecting into an outlet of the fuel circuit. The metering rod is movable relative to the outlet in response to the choke valve opening and closing to control the quantity of fuel entering the induction passage. An opening force is exerted on the choke valve in response to the vacuum created in the engine, the exertion of this opening force being delayed until after an initial opening force has been exerted on the choke valve. The exertion of the second opening force moves the choke valve from a first position to a second and more fully open position.

Abstract: A staged carburetor has a body in which a pair of induction passages are formed, an inner passage having a venturi and an outer passage encircling the inner passage. A throttle valve positioned at the outlet of the pair of passages controls the flow of air through the passages. Fuel is delivered to the inner passage through a fuel circuit having an outlet at the venturi. A fuel metering rod extends transversely of the passages and has a variable diameter end portion projecting into the outlet. The metering rod is movable relative to the outlet to vary the quantity of fuel delivered. An air valve positioned in the outer passage normally closes the passage whereby air is initially drawn into the engine only through the inner passage. Increased demand for air by the engine results in opening of the air valve so air is drawn into the engine through both passages.

Abstract: A carburetor has a choke device formed of two planar quadrangular choke flaps situated side-by-side in a cross-sectionally quadrangular flow passage of an engine intake manifold. The pivotal supports for the choke flaps are held in recesses of the manifold wall and define a pivotal axis that lies in an edge zone of the choke flaps that is immediately adjacent the manifold wall. The choke flaps further have cooperating edge zones that together define the cross section of the flow passage as a function of pressure conditions in the intake manifold. In the fully open position, the choke flaps are in a face-to-face engagement with opposite wall portions of the intake manifold.

Abstract: Discharge velocity of the air-fuel mixture being supplied through a variable venturi flow passage device to an internal combustion engine at idle to near idle operation of the engine is optimized by controllably varying the area ratio between the throat and exit planes of the device. Opposite jaw faces of the device define the flow passage that is gradually opened and closed in correlation to demand imposed on the engine between idle and full throttle operation. Area ratio control in one form is achieved by apparatus operative to selectively vary the diffuser angle between the opposing jaw faces. Area ratio control in another form is achieved by apparatus operative to effect a localized passage opening at idle of selectively different aspect ratio than the aspect ratio defined over the full longitudinal extent of the jaw faces.

Abstract: This invention discloses improvements in carburetors for internal combustion engines, so as to allow a change in the carburetor throat (venturi choke) in proportion to the admission of the gasoline-air mixture, with no change involved in the jet spray nozzle. In this manner, carburetors can be adapted to an extensive power range of gas engines. This variation is obtained through two cylindrical orthogonal sections, oppositely disposed at their curved sections and are centrally recessed, in such a manner that, while rotating or pivoting one against the other they will form a chamber with a central circular passage of a variable diameter, the largest being made up by the opposition of two of the edges and the smallest by the opposition of the two other edges.