| 摘要 |
PROBLEM TO BE SOLVED: To easily execute both the high-temperature durability design of a supercharger and the warmup control design of an exhaust purifying catalyst.SOLUTION: A structure contains a first exhaust collection port 10 having a collection part 16 for mutually connecting a first exhaust port 11 and a fourth exhaust port 14 to be collected therein, a second exhaust collection port 20 having a collection part 26 for mutually connecting a second exhaust port 22 and a third exhaust port 23 to be collected therein. Outlets 18, 28 of the respective exhaust ports 10, 20 are situated between a second cylinder #2 and a third cylinder #3 in a cylinder arranging direction and arranged close to each other. A passage cross-sectional area S2 of the outlet in the second exhaust collection port 20 with a shorter port length of the exhaust collection ports 10, 20 is set smaller than a passage cross-sectional areas S1 of the outlet in the first exhaust collection port 10 with a long port length (S2<S1). |
