Hybrid carburetor and fuel injection assembly for an internal combustion engine

A fuel injection assembly for delivering a fuel and air mixture into an intake manifold of an internal combustion engine, comprising:

• a housing including a plurality of bores each extending in an axial direction from an intake end for receiving a flow of air and an outlet end for delivering the flow of air into the intake manifold of the engine;
• a throttle valve disposed in each of said bores adjacent said outlet ends and pivotably connected to said housing for selectively controlling the flow of air through each of said bores;
• an insert disposed in each of said bores axially between said intake end and said throttle valve;
• each of said inserts having an outer surface and a venturi-shaped inner surface that is wide at each of its ends and has narrow region between said ends to define a low pressure region for the flow of air through said bores of said housing;
• said outer surface of each of said inserts presenting an annularly shaped channel aligned axially with said narrow region of said inner surface to present an annularly-shaped cavity which is defined at least partially by both said outer surface of said insert and said housing;
• a plurality of fuel injectors attached to said housing and in fluid communication with said annularly-shaped cavities to deliver a high-pressured flow of fuel into said cavities;
• each of said inserts including a plurality of apertures circumferentially spaced from one another for conveying the fuel from said high-pressured cavities into said low pressure region of the flow of air;
• said inner surface of each of said inserts further defining a shoulder facing towards said outlet and disposed axially in said narrow region to present a turbulent region for the flow of air flowing through each of said bores, and wherein said plurality of apertures of said inserts are disposed adjacent to said ledge for delivering the high pressure fuel into said turbulent and low pressure region;
• said housing presenting a plurality of idle paths extending from said fuel injectors to a location downstream of said throttle valves for delivering a flow of fuel into the intake manifold during idling of the internal combustion engine;
• and
• said outer surfaces of said inserts including at least one groove spaced axially on either side of said channel and a seal disposed in each of said grooves for sealing said inserts to said housing.