What is the normal range for ignition advance angle?
2 Answers
The normal range for ignition advance angle is between 6 and 12 degrees. More relevant information is as follows: 1. The ignition advance angle refers to the angle through which the crankshaft rotates from the moment of ignition until the piston reaches the top dead center of compression. This angle allows the engine to achieve better power performance, fuel economy, and emissions. To prevent power loss in the vehicle, it is recommended to set the ignition advance angle above 6 degrees, which is also the required rotational angle for starting the car. 2. An appropriate ignition advance angle can maximize the mechanical work done by the engine in each cycle. If the ignition advance angle is too large, detonation may occur; if it is too small, the engine temperature will rise. Factors affecting the ignition advance include engine speed and the combustion speed of the air-fuel mixture.
Back in the factory, I helped senior mechanics adjust ignition timing for many cars, and there's really no universal standard for this. Take the most common family cars as examples - Toyota models usually fluctuate between 10 to 15 degrees, while German turbocharged cars generally need to be advanced to 15-20 degrees. The key is observing engine conditions - during cold starts, the ECU automatically retards it to around 5 degrees to prevent knocking, but when RPM exceeds 3000, it often jumps past 35 degrees. In my opinion, CNG-converted vehicles are the trickiest - the changed intake temperature requires specialized ignition map recalibration. Nowadays repair shops use diagnostic tools to read real-time data streams, adjusting while monitoring knock sensor readings for precision.
