Patent ID: 8104273

Claim:
An exhaust manifold ( 12 ) comprising: an outer casing ( 18 ) comprising: an outer shell ( 22 ); a flange ( 24 ) which is welded to the outer shell ( 22 ) and which has a surface ( 24 B) for abutment against an engine cylinder head and at least one aperture ( 28 ) which opens at the abutment surface ( 24 A); at least one inner channel ( 20 ) which is arranged in the outer casing ( 18 ) and which opens via the at least one aperture ( 28 ); and a sealing joint ( 40 ) between the outer shell ( 22 ) and the at least one inner channel ( 20 ), the sealing joint ( 40 ) being in abutment against the flange ( 24 ), wherein the at least one inner channel ( 20 ) is formed only from a ceramic material, and the at least one inner channel ( 20 ) extends from one side to the other of the flange ( 24 ) through the at least one aperture ( 28 ) and comprises a continuation ( 32 ) formed only from ceramic material outside the outer casing ( 18 ) which extends outwards beyond the abutment surface ( 24 A), and a length of the continuation ( 32 ) is between 10 mm and 20 mm, the at least one inner channel having an outer surface facing directly an inner surface of the at least one aperture.