Well, below you will find a “heat range cross reference chart” that shows comparisons between 5 major brands of spark plugs.
Heat Range Cross Reference Chart:Įver wonder how spark plug heat ranges convert across brands? It can be a pain when you need a new spark plug but you don't know how your current heat range translate to a new brand. This can be very damaging to your vehicles engine as the plug will overheat causing abnormal ignition firing (pre-ignition), that can lead to melting of the spark plug electrodes as well as piston seizure and erosion. If a spark plugs temperature remains too low it can cause loss of ignition spark due to deposit build up on the firing end, which in turn will leave your engine struggling / down on power.
High power engines - high heat range (or cold) spark plugĪlthough not as damaging as having a too low rated plug, the effects can still be detrimental to your engine. Low power engines - low heat range (or hot) spark plug. Commonly, you can spot a low heat range (or hot) spark plug as it typically has a long thin insulator nose which can heat up quickly / easily and will not dissipate warmth to the metal shell as rapidly, where as a high heat range (or cold) spark plug has a short thick insulator nose which will transfer heat much easier. Low powered engines don't normally produce as much combustion warmth so won't heat up a plug as much or as rapidly as a high BHP vehicle, therefore the plugs have to be designed accordingly so they can reach and not exceed optimum operating temperatures. Generally, if a plug has a hotter heat rating it's simply not as thermally resistant as a cooler graded plug. Spark plugs heat ranges can vary massively from plug to plug, and (rather frustratingly) can be recorded in a number of different ways, making comparison between brands rather hard.
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