目前国产的摩托车,大都使用二冲程发动机。利用二冲程发动机排气时气体流动的惯性来提高发动机的功率,效果非常显著。只要安装的排气管合理,功率即可提高20～30%,每马力油耗量可降低10%以上。如果配气相角与之相配合,发动机功率可以提高更多。图1表示的是利用排气动力增压与未利用排气动力增压时的发动机外特性曲线。由曲线可知,利用排气动力增压和增加压缩比后,发动机功率由 At present, most domestic motorcycles use two-stroke engines. Using the inertia of the gas flow during the exhaust of a two-stroke engine increases the power of the engine, and the effect is very significant. As long as the installed exhaust pipe is reasonable, the power can be increased by 20 to 30%, and the oil consumption per horsepower can be reduced by more than 10%. If the gas phase angle matches it, the engine power can be increased more. FIG. 1 shows an engine external characteristic curve when using exhaust power boosting and unused exhaust power boosting. From the curve, it can be seen that after using the exhaust power boost and increasing the compression ratio, the engine power is