How to Read a Spark Plug Heat Range Chart?

[DelAdaline]

Spark plug heat range charts typically include numbers from 1 to 9, where 1-3 represent low heat range, 4-6 medium heat range, and 7-9 high heat range. Original equipment manufacturer (OEM) spark plugs usually come in heat ranges of 5, 6, and 7. The lower the number, the 'colder' the spark plug, meaning better heat dissipation. Below is an introduction to spark plugs: 1. Function of spark plugs: Spark plugs serve to conduct the high-voltage electrical pulse from the ignition coil into the combustion chamber, using the electrode's spark to ignite the air-fuel mixture, thus completing combustion. 2. Types of spark plugs: Common spark plugs are categorized into resistor spark plugs, platinum spark plugs, and iridium spark plugs. Generally, resistor spark plugs have a lifespan of 20,000 kilometers, platinum spark plugs last up to 40,000 kilometers, while iridium spark plugs can endure between 60,000 to 80,000 kilometers.