| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas passage structure improved in filling efficiency of suction air by reducing exhaust gas interference with a simple structure in a multiple cylinder engine. SOLUTION: The exhaust gas passage structure of an exhaust gas passage in which exhaust gas discharged from each cylinder of the multiple cylinder engine is collected and flows, is provided with a deflection part 72 formed in exhaust pipes 27, 32 in which exhaust gas from a cylinder #3 in which ignition is done later in two cylinders #3, #7 of which interval of discharged exhaust gas is shortest under a condition ignition order of each cylinder #1-#8 is successive with uneven interval in a specific collection step of exhaust gas flows. Since the deflection part 72 deflects part of pressure wave of blow down pressure wave flowing reversely against a flow direction of exhaust gas, exhaust gas interference at an exhaust port 13 is inhibited, and filling efficiency of suction air in suction stroke is improved. COPYRIGHT: (C)2008,JPO&INPIT
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