An experimental study on the engine ignition performance using a test platform consisting of an electric dynamometer was conducted, and a naturally aspirated gasoline engine with four types of spark plugs was designed. The results show that the average demand voltage of engine ignition is related to the engine load and spark plug gap, and the average demand voltage increases by about 1 kV for every 0.1 mm increase in gap. The demand energy of the engine ignition is related to the speed and load of the engine, the available energy of the ignition needs to maintain a certain margin relative to the demand energy of the ignition, and the voltage of the ignition in transition condition and the demand energy of the ignition are lower than that of the steady state condition. The ignition coil magnetization time and ignition energy are approximately linear, and the combustion stability will deteriorate significantly only when the magnetization time is reduced to less than 40%.