Heat range reference chart of some popular brands You will have the basic understanding whether it is a hot or cold spark plug of 5 majors spark plug brands. Let’s take a look on the heat range chart where there is full information about the number. High power engines – high heat range or cold spark plug Heat Range Reference ChartĪs we mention above, the heat range for NGK spark plugs varies from 2-11. Low power engines – low heat range or hot spark plug When the heat range is too low, it can be very damaging to your vehicle’s 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. 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. What Happens If The Heat Range Is Too High Or Too Low? Heat Range Is Too HighĪlthough not as damaging as having a too low rated plug, the effects can still be detrimental to your engine. Whether a spark plug is hot or cold is known as the heat range of the spark plug. Cold plugs are ideal for high rpm engines, forced induction applications, and other instances where the engine produces high operating temperatures. A hot spark plug and cold spark plug Cold Spark PlugĪ cold spark plug is a plug which conducts more heat out of the spark plug tip and lowers the tip’s temperature. Because they have a longer insulator nose length, heat is transferred from the firing tip to the cooling system at a slower pace. Hot plugs are good for applications that operate mainly at low rpms. Detonation (engine knocking) or disintegrate centre electrodes are too hot spark plug symptoms. How To Gap Spark Plugs: Explained In Simple StepsĪ hot spark plug is a plug which transfers heat slowly from the firing tip into the engine head, keeping the firing tip hotter.Types Of Spark Plugs And Their Functions.Tips To Choosing The Right Spark Plug Wires For Your Vehicle.In broad terms, spark plugs are often referred to as the term hot spark plug or cold spark plug. Typically the heat range for NGK Spark Plugs varies from 2-11. What Is Hot Spark Plug? What Is Cold Spark Plug?Įach spark plug manufacturer designs the heat range with a number. However, for NGK, the higher the number, the colder the plug. Some manufacturers numbering systems are opposite the other – for Champion, Autolite and Bosch, the higher the number, the hotter the plug. The heat range numbering system used by spark plug manufacturers is not universal. Usually, spark plug manufacturers recommend that the tips temperature remain around 500 – 850 celsius degrees. So choosing the right heat range is crucial for high performance engines. If the spark plug is too cold, it will be unable to properly self-clean by burning off carbon deposits. In specific,if the spark plug is too hot, your engine could experience detonation, pre-ignition, or power loss. Spark plug heat range is the speed at which a spark plug can transfer heat from the firing tip to the cylinder head water jacket and into the cooling system. Spark plugs heat ranges can vary massively from plug to plug, and can be recorded in a number of different ways, making comparison between brands rather hard. You may usually ignite the compressed fuel/air mixture by a spark plug, but do you really understand the spark plug heat range ? To make things easier and to help you understand that basic term, we are now introducing to you the definition of spark plug heat range and how it affects your engine and how to use it correctly.įirstly, let’s make a clear spark plug heat range explanation.
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