Engine intake manifold assembly

An improved intake manifold assembly for an internal combustion engine, said assembly comprising:

• top and bottom members made of sheet material, said members being joined by their edges and shaped so as to define an air intake throat section, a plenum a section downstream from said throat section and a plurality of tubular runners extending from said plenum to respective ports in a mounting plate affixed to the outer ends of said runners, and a throttle valve assembly insert contained in said throat section.

An intake manifold assembly for an internal combustion engine, said assembly comprising:

• top and bottom members made of sheet material, said members being joined by their edges and shaped so as to define an air intake throat section, a plenum section downstream from said throat section and a plurality of tubular runners extending from said plenum to respective ports in a mounting plate affixed to the outer ends of said runners, a throttle value assembly insert contained in said throat section, and an intake horn insert contained in said throat section and disposed upstream from said throttle valve assembly insert, said inserts jointly defining a passageway for circulating heating fluid.

An intake manifold assembly for an internal combustion engine, said assembly comprising:

• top and bottom members made of sheet material, said members being joined by their edges and shaped so as to define an air intake throat section, a plenum section downstream from said throat section and a plurality of tubular runners extending from said plenum to respective ports in a mounting plate affixed to the outer ends of said runners, a throttle valve assembly insert contained in said throat section, and means for by-passing intake air around the outside of said throttle valve assembly insert, said means including an entrance horn insert contained in said throat section upstream from said throttle assembly insert, said entrance horn being formed such that an annular space is defined by the outside of said horn insert and the inside of the surrounding throat section, and at least one aperture in said horn insert providing communication between said space and the interior of said horn insert.

An intake manifold assembly for an internal combustion engine, said assembly comprising:

• top and bottom members made of sheet material, said members being joined by their edges and shaped so as to define an air intake throat section, a plenum section downstream from said throat section and a plurality of tubular runners extending from said plenum to respective ports in a mounting plate affixed to the outer ends of said runners, a throttle valve assembly insert contained in said throat section, and a fuel injection rail having a plurality of receptacles for holding a plurality of electromagnetic fuel injectors and supplying fuel to said injectors, said rail overlying the mounting plate ends of said runners and being integrally attached to said runners ends.