What is the purpose of the capacitor in a capacitor discharge ignition system?

The purpose of the capacitor in a capacitor discharge ignition (CDI) system is to amplify the spark. In CDI systems, the capacitor stores energy and, when triggered, releases that stored energy all at once. This results in a high-voltage spark that ignites the fuel-air mixture in the engine's combustion chamber. The rapid discharge of the capacitor contributes to a more intense spark, which can improve ignition reliability and engine performance, especially under varying conditions. Thus, the function of the capacitor is critical for ensuring that the ignition system provides a strong, effective spark necessary for engine operation.