What Is Spark Plug Heat Range?
Heat range describes a spark plug's ability to transfer combustion heat from the firing tip to the cylinder head cooling system. A "hot" plug (long insulator nose) retains more heat for self-cleaning at low loads. A "cold" plug (short insulator nose) dissipates heat quickly for high-performance engines.
Selection
Use the OEM-specified heat range. In the UAE, air-cooled or turbocharged engines may benefit from one step colder to compensate for higher ambient temperatures. BRISK uses a numerical heat range system documented in the Spark Plug Guide.
Frequently Asked Questions
How do I choose the correct heat range?
Always use the vehicle manufacturer's recommended heat range as the starting point. A plug that is too hot causes pre-ignition and electrode damage. A plug that is too cold causes carbon fouling. In the UAE's hot climate, some mechanics prefer one step colder for high-performance or turbocharged engines.