Where to Find the Heat Rating of a Spark Plug?

[LaLiam]

The heat rating of a spark plug is represented by numbers, which are usually located in the middle of the model number. For example, in the model BP5ES11, the number 5 indicates the heat rating of the spark plug. It's worth noting that heat ratings vary by brand, and each brand's heat rating corresponds to specific vehicle models, so it's important to check carefully when purchasing. Spark plugs, commonly known as sparkers, function by discharging the high-voltage pulses sent through the high-tension leads (spark plug wires), creating an electric spark that ignites the air-fuel mixture in the cylinder by jumping the gap between the two electrodes. The main types of spark plugs include: standard spark plugs, projected insulator spark plugs, electrode spark plugs, seat-type spark plugs, surface-gap spark plugs, and surface-discharge spark plugs.