WHY ARE THERE DIFFERENT HEAT RANGES?

It is a common misconception that spark plugs create heat. They don’t. A heat range refers to how much heat a spark plug is capable of removing from the combustion chamber.

Selecting a spark plug with the proper heat range will ensure that the tip will maintain a temperature high enough to prevent fouling, yet be cool enough to prevent pre-ignition. While there are many things that can cause pre-ignition, selecting a spark plug in the proper heat range will ensure that the spark plug itself is not a hot spot source.

Learn about the various heat ranges and why knowing about them is important.