Partially Integrated Exhaust Manifold

摘要

A partially integrated manifold assembly is disclosed which improves performance, reduces cost and provides efficient packaging of engine components. The partially integrated manifold assembly includes a first leg extending from a first port and terminating at a mounting flange for an exhaust gas control valve. Multiple additional legs (depending on the total number of cylinders) are integrally formed with the cylinder head assembly and extend from the ports of the associated cylinder and terminate at an exit port flange. These additional legs are longer than the first leg such that the exit port flange is spaced apart from the mounting flange. This configuration provides increased packaging space adjacent the first leg for any valving that may be required to control the direction and destination of exhaust flow in recirculation to an EGR valve or downstream to a catalytic converter.

主权项

1. A partially integrated manifold assembly for a multi-cylinder internal combustion engine, comprising:
a cylinder head having a body portion and at least one port corresponding to each cylinder in an engine block; and a manifold portion including:
a first leg coupled to the body portion and having a first passageway formed therethrough to provide fluid communication from a first port formed in said cylinder head to a first exit port formed in a first flange, wherein said first flange is disposed on an end of said first leg opposite said body portion;a second leg integrally formed with said body portion and separate from said first leg and a second passageway formed therethrough to provide fluid communication from a second port formed in said cylinder head to a second exit port formed in a second flange, wherein said second flange is disposed on an end of said second leg opposite said body portion;a third leg integrally formed with said body portion but separately formed from said first leg and a third passageway formed therethrough to provide fluid communication from a third port formed in said cylinder head through a third exit port formed in a third flange, wherein said third flange is disposed on an end of said third leg opposite said body portion; wherein the length of said first leg is substantially shorter than the length of said second leg and substantially shorter than the length of said third leg.