Is an ignition advance angle of 20 degrees normal?
1 Answers
An ignition advance angle of 20 degrees is not normal. Here are the relevant details: 1. 10°-15° is optimal: If the spark plug ignites before the piston reaches top dead center, then when the piston exactly reaches top dead center, the combustible gas mixture can immediately and completely burn (theoretically, the highest gas pressure occurs 10°-15° after the compression top dead center is optimal). This can greatly reduce the loss of gas thrust, thereby enhancing the engine's power output. 2. Note: This means that before the engine piston reaches the compression top dead center, the spark plug must fire in advance. 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.