Spark Plugs — General Information and Specifications (Mazda 121 (3))

The spark plug consists of a central electrode, an insulator with a housing, and a ground electrode. The ground electrode is very tightly connected to the insulator, and the insulator is tightly connected to the housing. A spark jumps between the central and side electrodes and ignites the fuel-air mixture. The spark determines the readiness to start, idling, acceleration quality, and maximum speed. In this regard, you should not deviate from the type of spark plugs recommended by the manufacturer, which, among other things, are selected according to the heat rating.

The glow number characterizes the heat load of the spark plug. The lower the glow number of the spark plug, the higher its heat load. The spark plug can also better dissipate heat, which prevents harmful pre-ignition (engine detonation). A spark plug with a high thermal load also has the disadvantage that its self-cleaning temperature is higher. It is therefore more prone to the formation of soot, especially when the engine rarely reaches its operating temperature while driving (city traffic mode, short trips in winter). As a rule, "cold" spark plugs are installed on "hot" engines, as well as on power units that require greater power. The glow number of the spark plug is usually contained in its designation.

Note: Replacing spark plugs is described in chapter "Maintenance operations".

Spark plugs required

Note: Technical progress is constant. Therefore, it may be possible to use other models of spark plugs. In this regard, when buying new spark plugs, it is recommended to consult a workshop or store.

[Original material on the website: MAZBOOK.RU]