| 摘要 |
PURPOSE:To improve output by effectively utilizing the exhaust pulsation by allowing a pair of exhaust pipes at right and left to communicate through front and rear communication pipes and closing a control valve installed into the front communication pipe in low or intermediate speed operation and opening the control valve in high speed operation. CONSTITUTION:The extension edges of the first and the fourth exhaust pipes 10 and 10 of a multicylinder engine are connected to the front edge of a left-side collection exhaust pipe 15, and the second and the third exhaust pipes 11 and 12 are connected to a right-side collection exhaust pipe 16, and mufflers 9 and 9' are connected to the rear edges of the collection exhaust pipes 15 and 16. A front communication pipe 17a and a rear communication pipe 17b for the communication between the right and left exhaust pipes 16 and 15 are installed, and a control valve 19 is installed into the front communication pipe 17a. Said control valve is closed when the engine is in low or intermediate speed revolution, and opened in high speed revolution. Therefore, the engine output can be improved by effectively utilizing the exhaust pulsation.
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