In addition, the alloy compositions in the electrodes can be changed. This means you may not be able to visually tell a difference between heat ranges. An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as adding a turbo or supercharger, increasing compression, timing changes, use of alternate fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature, necessitating a colder plug.
A good rule of thumb is, one heat range colder for every 75—hp added. The heat range numbering system used by spark plug manufacturers is not universal. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. If it the heat range is too hot, your engine could experience detonation, pre-ignition, or power loss.
Heat ranges are designated by each spark plug manufacturer with a number. Advertisement Cold plugs are ideal for high rpm engines, forced induction applications, and other instances where the engine produces high operating temperatures. Conversely, hot plugs are good for applications that operate mainly at low rpms. Because they have a longer insulator nose length, heat is transferred from the firing tip to the cooling system at slower pace. This keeps the spark plug temperature high, which allows the plug to self clean and prevent fouling.
Unfortunately, heat range numbers are not universal—each brand has its own method for assigning heat ranges. It was common before the modern era of computerized fuel injection to specify at least a couple of different heat ranges for plugs for an automobile engine; a hotter plug for cars which were mostly driven mildly around the city, and a colder plug for sustained high speed highway use.
Racing engines, however, still benefit from picking a proper plug heat range. Very old racing engines will sometimes have two sets of plugs, one just for starting and another to be installed once the engine is warmed up, for actually driving the car. Green Spark Plug Co. Ltd has now added a dedicated sales and distribution team to handle customers questions and pre-sales enquires, we are experts in our field so if you have a query let us know!
Fast Delivery - Products in stock for same day dispatch. Cut off 1pm GMT. Est - Over one million spark plugs sold. All Rights Reserved. VAT no: GB The content contained in this article is for informational purposes only and should not be used in lieu of seeking professional advice from a certified technician or mechanic.
We encourage you to consult with a certified technician or mechanic if you have specific questions or concerns relating to any of the topics covered herein. Under no circumstances will we be liable for any loss or damage caused by your reliance on any content.
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