| 摘要 |
PURPOSE:To improve charging efficiency by providing an auxiliary intake port which is closed to the open air and communicates with other cylinders besides an intake port for supplying intake air in each combustion chamber, and establishing each of the lengths of a communicating passage communicating with the auxiliary intake port and of an intake air supplying passage so as to produce the maximum dynamic effect in said passages at the same number of revolutions of an engine respectively. CONSTITUTION:The combustion chamber of each cylinder 2 has an intake port 6 which communicates with an air cleaner 14 and makes air intake, and is provided with an auxiliary intake port 9 which communicates mutually with other cylinders through a communicating passage 22 closed to the open air and an intake air diffusing chamber 21 besides said port 6. Pressure vibration is caused in both an intake passage 11 and the communicating passage 22, and each length of said passages is established so as to produce the maximum pressure vibration at the same number of revolutions of an engine in said passages respectively. Thus the pressure vibration in said both passages can produce the maximum charging efficiency at the specified number of revolutions of the engine. |
