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. Thermal edge and spark support gap help prevent carbon buildup for better ignition under various combustion conditions.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. * Improper combustion condition and wrong heat range selection may cause damage to the spark plug. New material and design improve durability which allows for use under hard combustion conditions like continuous high load during circuit driving or aggressive tuning. The thermal edge of the ceramic insulator discharges to help decrease carbon deposits.ĭischarge occurs in the spark support gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup.ĭecreased voltage requirement strengthens ignition performance under harsh conditions like lean mixture or high boost pressure. This anti-vibration design improves longevity of the outer electrode.Īfter long idling or under various combustion conditions, carbon buildup can occur causing misfires. The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. Short Type Outer Electrode (Anti-Vibration).The outer electrode features a shortened tip design and tapered shape while maintaining the necessary space for proper ignition. The outer electrode incorporates a square platinum chip which improves durability, and combining with the iridium center electrode boosts ignition performance. Iridium alloy center electrode reduces voltage requirement and improves ignition performance and durability.
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