Patent ID: 7171805

Claim:
An exhaust manifold for an engine having at least one combustion chamber and at least one exhaust valve for each such combustion chamber, comprising: a housing formed to provide a longitudinally extending main exhaust gas passage terminating in an outlet at one end thereof; a plurality of discrete inlet branch passages formed in the housing laterally spaced from one another and arranged to provide separate gas passages operatively connected to an associated exhaust valve of said engine; and a plurality of laterally spaced and radially extending exhaust gas openings in said housing and arranged to pneumatically connect said separate gas passages of the inlet branch passages to said main exhaust gas passage, wherein said exhaust gas openings are disposed in series along the length of one side of said housing, wherein the one of said plurality of inlet branch passages and its associated exhaust gas opening is positioned at an end of said housing opposite said exhaust gas passage outlet, said housing having an inner wall extending from the end inlet branch passage to the main exhaust gas passage so as to redirect the flow of exhaust gas exiting said associated exhaust valve and entering the main exhaust gas passage; and the other inlet branch passages of said plurality of exhaust gas inlet branch passages having an integrally formed deflector member positioned between said exhaust gas opening and said main exhaust gas passage, wherein said deflector member is arranged to provide an angular change of flow direction requiring exhaust gas to enter the main exhaust gas passage in the downstream direction.