What is the normal ignition advance angle for cylinder 1?

[OwenLynn]

Different vehicle models have different ignition advance angles. Here are the detailed explanations: 1. During idle: Approximately 8°-15°. The factors affecting the ignition advance angle are engine speed and the combustion speed of the air-fuel mixture. The faster the speed, the shorter the time it takes for the crankshaft to rotate the same angle, requiring a larger advance angle to achieve the corresponding advance time. The combustion speed of the air-fuel mixture is related to the composition of the mixture, the engine's structure, and other factors such as the shape of the combustion chamber and the compression ratio. 2. An appropriate ignition advance angle allows the engine to perform more mechanical work in each cycle. If the ignition advance angle is too large, it can cause knocking; if it is too small, fuel consumption increases, power decreases, exhaust temperature rises, and noise increases. These factors can all affect the engine's speed increase. 3. The ignition advance angle tends to be lower when the car is idling. Theoretically, the minimum ignition advance angle is 0°, but to avoid igniting the air-fuel mixture during the power stroke, it is often set above 5°, which is also the angle required for starting speed.