What is a key fact about spark plug heat range numbers?

The concept of spark plug heat ranges is critical for engine performance and longevity. A lower heat range number indeed indicates a hotter plug. This means that the spark plug is designed to operate at a higher temperature, which is essential for promoting better combustion in certain engine conditions. Hotter plugs can help to prevent fouling by burning off carbon deposits more effectively, making them suitable for engines that run at higher temperatures.

Understanding the heat range is vital because it directly influences how well the spark plug functions in relation to the engine's demands. If a spark plug operates at too low a heat range, it may not reach the necessary temperature for optimal combustion, potentially leading to fouling and poor performance. Conversely, if the heat range is too high, it risks overheating and can cause pre-ignition.

The other options present misconceptions about how spark plug heat ranges work, emphasizing the importance of grasping this aspect for effective engine tuning and maintenance.