Patent ID: 6945237

Claim:
An intake manifold for supplying air and exhaust recirculation gas (EGR) to an internal combustion engine, the cast manifold comprising: an air intake port; an intake chamber receiving intake air from the intake port; an outlet plenum communicated with the engine; an EGR inlet port; first and second spaced apart EGR valve chambers; a first EGR passage communicating the EGR inlet port with the first EGR valve chamber; a second EGR passage communicating the EGR inlet port with the second EGR valve chamber; a central EGR outlet passage communicating an end of each EGR valve chamber with a central portion of the plenum; a first EGR outlet chamber receiving EGR from the first EGR valve chamber and having outlet ports communicating with a first end of the plenum; a second EGR outlet chamber receiving EGR from the second EGR valve chamber and having outlet ports communicating with a second end of the plenum; and a wall separating the intake chamber from the central EGR outlet passage chamber and from one of the EGR inlet passages, said wall creating turbulence in the intake air as the EGR from the central EGR outlet passage mixes with intake air from the intake chamber.