| 摘要 |
PURPOSE:To variably form length of an intake pipe so as to improve an output of an engine by providing a plurality of air introducing passages formed in a cowling to introduce running air to the intake pipe, and a valve provided partly in a plurality of the introducing passages. CONSTITUTION:Running air enters from opening parts 14, 14 in a front surface of a cowling 13 to cool radiators 7, 7a, and also the running air is partly introduced to each intake pipe 9 via an air introducing passage 16, collective part and a sealed box 19 from a guide air port 15 formed in a front surface one side of the cowling 13. Here, since the running air is introduced efficiently by the shortest distance into the sealed box 19 via the guide air port 15, a high positive pressure acts in an opening part of the intake pipe 9, thus to improve charge air ratio and an output. Length of the intake pipe of an engine from its intake hole to the atmosphere is variably formed, and an efficient intake inertia effect and a pulsation effect can be obtained. |
