| 摘要 |
PROBLEM TO BE SOLVED: To improve engine output by enhancing intake efficiency. SOLUTION: An inlet port member 47 in an inlet passage 33b for an engine 6 is faced into an inlet box 36 for the engine. The inlet port member 47 has an inner diameter gradually enlarged as tending from a base portion 47b having almost the same inner diameter as the inlet passage 33b to a mouth portion 47a, and a porous member 58 is arranged near the mouth portion 47a. Furthermore, porous members 58 are arranged near a plurality of inlet ports in the inlet box 36 in a compact form to produce a reduction in volume between the porous member 58 and a combustion chamber of the engine while suppressing the dispersion of intake resistance at each inlet port. |
