What is Ignition Advance Angle?

[SilasLynn]

Ignition advance angle is specifically explained as follows: Ignition advance refers to the spark plug firing before the engine piston reaches the compression top dead center. The angle through which the crankshaft rotates from the moment the spark plug fires until the piston reaches the compression top dead center is called the ignition advance angle. Extension: Since it takes a certain amount of time for the flame to propagate from the spark plug firing until the combustible mixture in the cylinder is completely burned, and the engine operates at very high speeds, if ignition starts exactly when the piston reaches the top dead center, by the time the combustible mixture begins to burn completely, the piston will inevitably have already started moving downward. This would result in a loss of gas thrust and ultimately lead to a decrease in engine power.