How to change the ignition advance angle of automobile?

Mechanical centrifugal vacuum regulating device for changing automobile ignition advance angle. The following describes the ignition angle adjustment method: centrifugal ignition advance regulator: when the engine speed changes, it automatically changes the phase relationship between the circuit breaker cam and the distributor shaft and changes the ignition advance angle. With the increase of rotating speed, the centrifugal force of the weight increases, the weight is thrown out against the spring force, and the cam advances an angle on the shaft through the linkage device to increase the ignition advance angle. The device works when the crankshaft speed is 400~ 1500 rpm. Vacuum ignition advance angle adjusting device: when the engine load, that is, the throttle opening changes, the ignition advance angle is automatically adjusted. With the change of throttle opening, the surrounding vacuum degree will also change. Through the vacuum chamber and its linkage, the distributor housing, the fixed disk and the contacts retreat at a certain angle relative to the cam, increasing the ignition advance angle. The device does not work at the maximum (fully open) and minimum (close to fully closed) throttle opening.