供油起始角也叫供油位角。当柱塞副开始供油时,柱塞中心线与凸轮对称中心线的夹角叫做供油起始角(见附图1)。供油起始角的变化直接影响发动机的工作状况。由此造成供油规律及雾化质量的变化,同时也会引起发动机供油提前角的变化。多缸发动机还将影响供油提前角的一致性。因此,在使用中,如果只检查供油提前角,而忽视了供油起始角的检查 The starting angle is also called the fuel supply angle. When the plunger pair starts to supply oil, the angle between the plunger center line and the symmetry center line of the cam is called the oil supply start angle (see Fig. 1). Changes in fuel supply starting angle directly affect the working conditions of the engine. As a result of changes in the law of fuel supply and atomization quality, but also lead to changes in the advance angle of the engine oil supply. Multi-cylinder engine will also affect the fuel supply advance angle of consistency. Therefore, in use, if only check the fuel supply advance angle, ignoring the fuel supply starting angle of inspection