What is Ignition Advance Angle?
2 Answers
From the moment of ignition until the piston reaches the top dead center of compression, the angle through which the crankshaft rotates during this period is called the ignition advance angle. Adjusting the ignition advance angle: Remove the secondary chamber vacuum hose from the vacuum advance compensation device and block the two ports connected to the hose. Run the engine at idle speed, then use a timing light to check the ignition advance angle. Verifying the ignition advance angle: Start the engine and repeatedly press the accelerator pedal. If the engine feels powerful and there are no abnormal knocking sounds, it indicates that the ignition advance angle is appropriate. A timing light can also be used to confirm the ignition advance angle. As the engine speed increases, the timing mark will move in the direction of increasing ignition advance angle.
Ignition advance angle is a technical term for the timing of engine ignition. Simply put, the spark plug needs to fire before the piston compresses the air-fuel mixture to its maximum point, because flame propagation takes time. The faster the engine rotates, the more the ignition timing needs to be advanced, just like extending your leg earlier when running. If this isn't properly adjusted, the car will feel sluggish and consume more fuel, and worst-case scenario, engine knocking may occur in the cylinder. Every time a 4S shop plugs a diagnostic tool into the OBD port to read data streams, this parameter is included. Older cars have mechanical centrifugal adjustment devices in the distributor, while modern ones are directly controlled by the ECU module, automatically fine-tuned using RPM sensors and knock sensors. Performance tuning enthusiasts love tweaking this parameter the most.
