| 摘要 |
PURPOSE:To maintain uniform combustion among cylinders by providing a muffling cavity in one of exhaust pipes between exhaust ports of fore and aft cylinders of an internal-combustion engine and their joint area so that the pulsation and pressure of the respective exhaust pipes may become uniform. CONSTITUTION:Exhaust pipes 2, 2 extending from the exhaust ports of fore and aft cylinders 1, 1 of a V-engine are joined in a joint area 3, and then connected to a muffler 4. In such an arrangement, a muffling cavity 5 is disposed in one of the exhaust pipes 2, 2 between the exhaust ports of the fore and aft cylinders 1, 1 and the joint area 3. The adjustment of the transmission velocity and pressure level of the exhaust pulsation and sonic pulsation is performed by the muffling cavity 5. As a result, the combustion in the respective cylinders 1, 1 can be made almost uniform, and an improvement of fuel economy and engine output as well as prevention of unpleasant noise can be achieved. |
