Abstract: An exhaust gas recirculation system for a turbocharged internal combustion engine utilizes dynamic forces to enhance exhaust gas flow through the EGR system. An impact tube is disposed facing upstream in the exhaust tract of the engine to increase the static pressure by the dynamic pressure of the flow. The EGR outlet to the engine air intake tract is disposed about an intake air tube to create an annular exhaust passage thereabout which opens into a radially outwardly stepped wall of the intake tract thereby creating a low pressure region at the exit from the EGR system. Still further, the intake tract housing is provided with an arcuate radially diverging wall surface so that the exhaust gas follows the wall in accordance with the Coanda principle and induces increased flow through the intake tract from the turbocharger.

Abstract: An improved configuration of the intake manifold interface of a diesel engine cylinder head includes semicylindrical columnar structures disposed adjacent intermeidater port inlets, the columnar structures being separated by a depressed chamber in the interface surface. The end port inlets are provided with a columnar structure to the inboard side thereof with the outboard side of each end port inlet being a smooth continuation of the inner wall of an intake manifold to be mated against a planar sealing surface disposed around the interface surface of the cylinder head.