Spark plugs — general information

Spark plugs consist of a central electrode, an insulator with a housing and a ground electrode. The mass electrode is hermetically connected to the insulator, the insulator is firmly connected to the body. An ignition spark jumps between the central electrode and the ground electrode, which should ignite the air-fuel mixture.

The spark plugs determine the readiness of the engine to start, the idling characteristic, the acceleration characteristic and the maximum speed. Therefore, without good reason, you should not refuse the type of spark plugs that the manufacturer installs and recommends using; the choice of this type is determined by the glow number of the spark plug. The glow number of a spark plug indicates the degree of thermal loading of the spark plug. The lower the glow number, the higher the thermal load of the candle. The candle removes heat better, as a result of which it is possible to eliminate the harmful detonation knock.

The disadvantage of candles with a higher thermal load is that their self-cleaning temperature also becomes higher. Therefore, carbon builds up faster on the plug, especially in cases where the engine often cannot reach its operating temperature during driving (riding in the city, driving short distances in winter). Usually, "cold" spark plugs are installed in "hot" engines, i.e. in engines that require high power. The glow number is included in the spark plug code.