Tangential airflow is produced through airflow nozzle against from the valve gap to the outside of cylinder wall, therefore produced swirl depends on the angle between cylinder wall and airflow nozzle, depends on port location and direction and shape of port runner. 切向气流通过气门间隙到气缸壁外的气流喷嘴撞击产生的,因此所产生的涡流取决于缸壁和气流喷嘴之间的角度,取决于气道定位和气道浇口部分的方向和形状。