| 摘要 |
PURPOSE:To improve the output of an engine from its medium speed range, by both obtaining a supercharge effect through the proper pulsation effect of intake in each cylinder itself and supplementing a decrease of the output in the bottom part of pulsation with an exhaust interference effect mutually between cylinders, when the two-cylinder engine of side intake port type is driven at a high speed. CONSTITUTION:When an engine is driven at a high speed, an expansion wave, generated in passages 16a, 16b by a start of intake of an intake port 3, is repeated with the inversion and reflection to a compression wave by the adequate length of a passage between each intake port 3 and an expansion chamber 21 and propagated to the intake port 3 immediately before full closing in each cylinder 1A, 1B, and an output is improved by its own supercharge effect of the wave. While a compression wave, generated in, for instance, the passage 16b at opening, is propagated to the intake port 3 immediately before full closing with a 180 deg. phase difference in the cylinder 1A by setting the length of a passage between the intake ports 3, 3 from the range of medium speed. In such way, an output at the medium speed being the bottom part between the secondary pulsation and the tertiary pulsation in an intake proper pulsation effect can be improved. |
