What is the ignition advance angle in degrees?
1 Answers
Generally, the ignition advance angle is around 6-12°C. More detailed information about the ignition advance angle is as follows: 1. Theoretically, the minimum ignition advance angle is 0 degrees. To prevent the air-fuel mixture from igniting during the power stroke (which would cause power loss), it is usually set above 5 degrees. This is also the angle required for starting speed. If ignition occurs too early, it can cause knocking, hinder piston movement, reduce efficiency, and increase thermal load, mechanical load, noise, and vibration. Therefore, late ignition should be avoided as it makes gas work harder, increases fuel consumption, reduces efficiency, and causes louder exhaust noise. Both early and late ignition can affect engine efficiency. 2. Besides engine speed, the optimal ignition angle is influenced by many factors, such as cylinder temperature and pressure. Higher cylinder temperature and pressure result in faster combustion of the air-fuel mixture, requiring a smaller ignition advance angle. Factors affecting cylinder temperature and pressure include engine compression ratio, ambient temperature, cylinder temperature, and load. 3. Higher gasoline octane ratings indicate stronger anti-knock capability, allowing for a larger ignition advance angle. The air-fuel mixture ratio also plays a role: both overly rich and lean mixtures burn more slowly, requiring an increased ignition advance angle. The air-fuel mixture ratio is mainly influenced by throttle opening and altitude.
