![]() 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. Excessively engine operating temperatures.įigures 28 and 29 show plugs that have been over heating due to intense knocking and pre-ignition.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.usually due to operating with an excessively high loaded prop. Plug heat rating too low, permitting the plug to exceed the optimum operating temperature range of 1560 - 1830 deg.Oil pumping past worn piston rings And valve guides.The plugs illustrated in Figures 25, 26, and 27 show varying degrees of melting of the electrode and may be the result of: ![]() Excessive cooling usually caused be an improperly functioning cooling system.Use of air-fuel mixtures richer than about 8:1 - 10:1.also may be due to too light prop loading conditions. A plug with too high a heat rating being used and the firing-end not reach it's self cleaning temperature of 750 - 840 deg.Oil pumping past warn piston rings and valve guides.įigures 3, 4, and 5 show the sooty plugs, which are usually the result of:.Even plugs presenting a good appearance, as those shown in Figures 6 - 24, can quite often be covered with lead deposits, which cause misfiring.įigures 1 - 2 show wet plugs and are normally attributed to one of the following causes: The information below is intended to assist you in correctly choosing your spark plugs and deter-mining operating condition of your engine. The appearance of the firing-end of a spark plug shows how well an engine has been operating, the suitability of the plug heat rating, and whether or not the carburetor and ignition timing are properly adjusted. The information below was taken from a pamphlet given out on NGK Spark Plugs in the late 1970's, it is just as valid today as it was then. ![]()
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