How to Adjust the Ignition Timing Advance Angle of a Car?
2 Answers
Changing the ignition timing advance angle of a car involves the use of mechanical centrifugal and vacuum-type adjustment devices. Below is an introduction to the methods for adjusting the ignition angle: Centrifugal Ignition Timing Advance Adjustment Device: When the engine speed changes, it automatically alters the phase relationship between the breaker cam and the distributor shaft to adjust the ignition timing advance angle. As the speed increases, the centrifugal force on the weights also increases, overcoming the spring force and causing them to move outward. This action, through a linkage mechanism, advances the cam on the shaft by an angle to increase the ignition timing advance angle. This device operates when the crankshaft speed is between 400 and 1500 rpm. Vacuum Ignition Timing Advance Adjustment Device: This device automatically adjusts the ignition timing advance angle when the engine load, i.e., the throttle opening, changes. The change in throttle opening alters the surrounding vacuum level, which, through the vacuum chamber and its linkage mechanism, causes the distributor housing and fixed plate, along with the contacts, to rotate relative to the cam, thereby increasing the ignition timing advance angle. This device does not function when the throttle is fully open or nearly closed.
I love tinkering with the ignition timing of old cars, especially those with distributors. Changing it is quite simple: first start the engine and let it warm up, locate the distributor, loosen the fixing screw with a wrench, and then slowly rotate it to adjust the timing. Turning it clockwise delays the ignition, while turning it counterclockwise advances it. Turn it slightly and listen for changes in the engine sound—if it runs smoother, you've got it right. After adjusting, remember to tighten the screw and take it for a test drive to see if acceleration improves. This job carries significant risks; over-adjusting can easily cause knocking or engine damage, so have your tools ready and handle with care. Regular maintenance of the ignition system, such as replacing spark plugs or checking sensors, can also prevent timing issues. The key is to practice more, don't be afraid of making mistakes, and gradually you'll develop a feel for it.
