Patent ID: 7832205

Claim:
An improved exhaust manifold for an engine having at least one combustion chamber and at least one exhaust valve for each such combustion chamber, said at least one exhaust valve arranged on a first plane, comprising; a housing formed to provide a longitudinally extending main exhaust gas passage terminating in an outlet at one end thereof, said main exhaust gas passage arranged on a second plane lower than said first plane; a plurality of discrete inlet branch passages formed in said housing laterally spaced from one another and arranged to provide separate gas passages operatively connected to an associated exhaust valve of said engine, said inlet branch passages having a floor and a ceiling which are initially level with said first plane of said exhaust valve for a distance equal to one-half the width of said inlet branch passage prior to sloping downward toward said second plane of said main exhaust gas passage; a plurality of laterally spaced and radially extending exhaust gas openings in said housing and arranged to pneumatically connect said separate gas passages of said inlet branch passages to said main exhaust gas passage; said exhaust gas openings disposed in series along the length of one side of said housing; one of said plurality of inlet branch passages and its associated exhaust gas opening 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 said main exhaust gas passage to redirect the flow of exhaust gas exiting said associated exhaust valve and entering said 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 (n) positioned between said exhaust gas opening and said main exhaust gas passage, wherein said deflector member (n) is arranged to provide an angular change of flow direction requiring exhaust gas to enter the main exhaust gas passage in the downstream direction; wherein at least one deflector member (n) extends longitudinally across an entire length of said corresponding exhaust gas opening such that a portion of said at least one deflector member (n) extends longitudinally beyond said corresponding exhaust gas opening in the downstream direction.