Originally Posted by
Caddyshack
Ngk spark plug site says this: The spark plug works as a heat exchanger by pulling unwanted thermal energy away from the combustion chamber, and transferring the heat to the engine's cooling system. The heat range is defined as a plug's ability to dissipate heat.
it doesn’t differentiate 2 or 4 stroke though on that page???
I can see how a 2 stroke head would transfer the heat to the cooling system.
And so if a hotter plug cannot dissipate the heat from the chamber.....it runs hotter with higher risk of detonation/pre-ignition. Hence it's hotter.
For someone to say a hotter plug is cooler on any engine makes no sense.