If the tip of the spark plug is too hot it can cause pre-ignition leading to detonation/knocking and damage may occur. The temperature of the insulator responds to the thermal conditions it is exposed to in the combustion chamber but not vice versa. However, the level of torque currently being produced by the engine will strongly influence spark plug operating temperature because the maximum temperature and pressure occurs when the engine is operating near peak torque output (torque and RPM directly determine the power output). There is no direct relationship between the actual operating temperature of the spark plug and spark voltage. This is determined by a number of factors, but primarily the actual temperature within the combustion chamber. Just enter your vehicle details to get started! Got a modified or track car? Not a problem, just give us a call on 01209 202 949 or use our custom recommendation form and we'll be happy to look into the best possible choice for you.The operating temperature of a spark plug is the actual physical temperature at the tip of the spark plug within the running engine. If you need to know which spark plugs are suitable for your vehicle, simply use our handy spark & glow plug product lookup. 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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