How to Explain Ignition Advance Angle?

[JonathanDella]

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. The ignition advance angle that enables the engine to achieve optimal power, fuel economy, and emissions is referred to as the optimal ignition advance angle. Functions of the ignition advance angle: 1. Increase output power: If ignition occurs exactly when the piston reaches the top dead center, the air-fuel mixture begins to burn as the piston has already started moving downward, leading to a decrease in engine power. Therefore, advancing the ignition ensures that the energy generated by the combustible mixture is effectively utilized, enhancing the engine's output power. 2. Improve mechanical efficiency: An appropriate ignition advance angle allows the engine to perform the maximum mechanical work per cycle.