What characterizes a low heat range spark plug?

A low heat range spark plug is characterized by its ability to not heat up easily. This characteristic is essential for lower horsepower engines because these engines typically operate at lower temperatures and have less thermal load compared to high-performance or high-horsepower engines. A low heat range spark plug helps to prevent pre-ignition and keeps the plug insulated from excessive heat, which can lead to engine knocking or damage in engines that do not produce enough heat to properly burn off carbon deposits.

In contrast, higher heat range spark plugs are designed to hold and transfer more heat, which is beneficial for high-output engines that operate at higher temperatures. These plugs can prevent fouling and ensure proper combustion in more demanding environments. Understanding the heat range of a spark plug is crucial for engine performance and longevity, as using the wrong spark plug can have detrimental effects on the engine's operation.