| 摘要 |
PURPOSE:To unify the intake quantities flowing through intake valves and improve the output by providing three intake valves for each cylinder, communicating intake passages connected to intake valves with a communicating chamber, and improving arrangement positions and shapes of intake valves and intake passages. CONSTITUTION:Two exhaust valves 18 and three intake valves 20 (20a-20c) are arranged on a cylinder head 12 for each cylinder, they are opened or closed by two overhead cam shaft type valve system mechanisms, the first and second intake passages 40a and 40b are formed in an intake pipe 38 for each cylinder, the downstream side is connected to a communicating chamber 46 provided on the cylinder head 12, and communicating chamber 46 is communicated to the intake valves 20 via intake passages 47 (47a-47c). Three intake valves 20 and the intake passages 47 are arranged perpendicularly to the cylinder train direction, and the intake passages 47a and 47c on both sides are formed in a nearly linear shape so as to be gradually and smoothly expanded toward the intake valves 20a and 20c from the communicating chamber 46. |
