To provide a suction device for an engine realizing high suction effect according to engine speed.
A collector tank rotatably provided in a longitudinal direction center part and including a serge tank resonator 4 therein, an intake manifold 12 connected to each cylinder of the engine, ports 7 connected to the intake manifold 12 are provided around a collector tank 5. A communication opening 8 communicating the collector tank 5 and the port 7, an opening part 9 communicating the surge tank resonator 4 and the port 7, and an angle part 11 toward a discharging side on an end part of the communication opening 8 are provided. Positions of the communication opening 8 and the opening part 9 can be changed according to rotation angle position of the collector tank 5.
MIYA HISAKAZU
TSUKAGOSHI SHIGEO
