How to Adjust the Ignition Timing Advance Angle of a Car?
1 Answers
Changing the ignition timing advance angle of a car involves using mechanical centrifugal and vacuum adjustment devices. Below is an introduction to the methods for adjusting the ignition angle: 1. Centrifugal Ignition Advance Adjustment Device: When the engine speed changes, it automatically alters the phase relationship between the breaker cam and the distributor shaft, thereby adjusting the ignition timing advance angle. As the speed increases, the centrifugal force acting on the weights overcomes the spring force, causing them to move outward. Through linkage mechanisms, the cam is advanced by an angle on the shaft to increase the ignition timing advance angle. This device is effective when the crankshaft speed ranges from 400 to 1500 rpm. 2. Vacuum Ignition Advance Adjustment Device: It automatically adjusts the ignition timing advance angle when the engine load, i.e., the throttle opening, changes. Changes in throttle opening affect the surrounding vacuum level, which in turn, through the vacuum chamber and its linkage, causes the distributor housing, fixed plate, and contacts to retreat relative to the cam by an angle, thereby increasing the ignition timing advance angle. This device does not function when the throttle is fully open or nearly closed.
