| 摘要 |
PURPOSE:To improve the output of an engine throughout from its medium speed range to high speed range, by obtaining a supercharge effect due to the exhaust interference mutually between cylinders at high speed operation of the engine while a supercharge effect due to the inertia pulsation of each cylinder itself at medium speed operation of the engine, in the case of a two-cylinder engine of side intake port type. CONSTITUTION:At high speed operation of an engine, a compression wave, generated in, for instance, a passage 16b when an intake port 3 in a cylinder 1B is opened, is propagated to an intake port 3 immediately before full closing with a 180 deg. phase difference in a cylinder 1A by setting a passage in an adequate length between the intake ports 3, 3, and a supercharge is operated. Similarly thereafter, an output of the engine is increased by an exhaust interference effect mutually between the cylinders 1A, 1B. While a compression wave, generated in passages 16a, 16b at closing, causes inversion and reflection with expansion and compression by setting the length of a passage between each intake port 3 and an expansion chamber 21 with the reference at medium speed time, and is propagated as a secondary pulsating compression wave to the next intake port 3 immediately after opening, thus an output at the medium speed time can be improved by a supercharging effect due to the inertia pulsation of each cylinder itself. |
