Patent ID: 6038855
Filing Date: 2000-03-21
Classification: F01N,F02B

Abstract:
A collector for the primary pipes of an exhaust manifold of an internal combustion engine, said primary pipes leading exhaust gases directly from the cylinders of said engine, said collector comprising a common cavity and a plurality of said primary pipes, each of said plurality of primary pipes including an inlet end and an outlet end, said outlet ends of each of said primary pipes including an inner wall and an outer wall and having a first cross-sectional area and an upstream location of said primary pipes having a second cross-sectional area, said first cross-sectional area being less than said second cross-sectional area, said outlet ends of said primary pipes being in direct contact with said common cavity of said collector, said plurality of pipes further arranged to include a single central pipe, and the remainder of said plurality of pipes being spaced around said central pipe, said outlet end of said central pipe being formed substantially as a conically tapering portion, and said outer wall of said central pipe forming part of said inner wall of each of said remainder of said pipes.