PROBLEM TO BE SOLVED: To provide an exhaust manifold capable of supplying secondary air without providing exhaust resistance.;SOLUTION: The exhaust manifold has a double pipe structure having an inner pipe 14 communicating with each exhaust port and an outer shell 16 for covering an inner pipe 14 by overlapping a first shell 18 and a second shell 20 divided in the longitudinal direction of the inner pipe 14. A recess 42 is formed in the first shell 18, a covering member 44 is mounted to cover the recess 42, thereby forming a secondary air supply flow channel 46. The covering member 44 is provided with a supply port 52 at the tip of a communication pipe 50 communicating with the secondary air supply flow channel 46 correspondingly to each exhaust port. The inner pipe 14 is provided with a connecting hole 54 for passing a communication pipe 50 on overlapping the first shell 18 and the second shell 20.;COPYRIGHT: (C)2004,JPO
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