Intake manifold system for V-type multiple cylinder internal combustion engine

An intake manifold system, comprising an upstream intake passage communicating with a main throttle valve located upstream thereof, an intake chamber communicating with the downstream end of the upstream intake passage, an intake manifold communicating with the downstream end of the intake chamber, and a plurality of downstream intake passages which are connected between the downstream ends of the intake manifold and intake ports of the engine in communication therewith, in a gap defined between two cylinder banks of a V-type multiple cylinder engine, wherein:

• the intake chamber extends along the direction of the crank shaft of the engine as a hollow chamber which is integrally formed with the intake manifold, and the upstream intake passage, which is connected between the throttle body and the intake chamber, inclines upward from its intake chamber end to its throttle body end;
• an EGR gas supply port opens at a downstream end of the upstream intake passage and is directed to a central part of the cross section of the intake chamber, said EGR gas port includes a tubular member which extends a certain distance into the downstream end of the upstream intake passage and aligns with a central axial line of the intake chamber.