| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust manifold offering simple construction for quickly increasing the temperature of a catalyst while controlling the decrease of the temperature of an exhaust gas right after starting an engine. SOLUTION: The exhaust manifold comprises a large flange 2, to be attached to an engine 100, having guide holes 10-13 corresponding to exhaust ports P2-P8, and a shell member 4 attached to the large flange 2 while covering the guide holes 10-13 to form an exhaust chamber 15. A first current plate 18 partitioning the exhaust chamber 15 with the inner wall of the shell member 4 to form a first exhaust gas flow passage 22 communicated with the guide holes 10, 11 in part and a second current plate 20 partitioning the exhaust chamber 15 with the inner wall of the large flange 2 to form a second exhaust gas flow passage 24 communicated with the other guide hole 12 are provided in the shell member 4.
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