*A spark plug's heat range has no relationship to the actual voltage transferred though the spark plug, Rather, the heat range is a measure of the spark plug's ability to remove heat from the combustion chamber. The heat rating is a measure of the amount of heat dissipation.The heat range of a spark plug is the range in which the plug works well thermally. Thanks for any replies or comments. Thus, a Champion spark plug for your engine may have a different heat range than an AC-Delco or Autolite meant for the same application. Set spark plug gap by spacing the side electrode the correct distance from the center electrode. The heat range of a spark plug is affected by the construction of the spark plug: the types of materials used, the length of insulator and the surface area of the plug exposed within the combustion chamber. • A longer insulator nose on a spark plug forces the heat from the tip to travel farther before it is absorbed. Why is spark plug heat range important? 33 Related Question Answers Found How do you find the spark plug number? rating of the operating temperature of the spark plug tip. Thermal balance between the input and output of heat from the spark plug is determined by the value known as the spark plug heat range. In this article, we’re just going to discuss heat range. 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. •Heat range is a measure of the spark plugs ability to remove heat from the combustion chamber. What does the R stand for on NGK Spark Plugs? ****Note: NGK IX and Denso plugs are Iridium. Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. A spark plug's heat range is determined by several factors: The surface area of the ceramic insulator nose . A COLDER or 'harder' spark plug is more suited to a hotter running engine (i.e. Choosing the right heat range is crucial for high performance engines. … E3 makes performance parts for performance vehicles, so if you are looking to seriously soup up your Predator engine then E3 is going to be a great option. The structure and material composition of the insulator . This is largely determined by the temperature of the gas inside the combustion chamber and the spark plug design. In the E3 spark plug product description, you will see that this is a race-car quality spark plug that is designed for colder heat rangers to keep the combustion chamber running hot. Please consult with head mfg. Spark plugs with a high degree of heat dispersal are called high heat range (cold type) and those with a low degree of heat dispersal are called low heat range (hot type). Determined by the length & diameter of the insulator tip & the ability of the plug to transfer heat into the cooling system. high performance, high revving, tuned or driven very hard), the shorter heat path will conduct heat more quickly, ensuring that the tip does not overheat. spark plug nearest the exhaust valve will fire first. At what point do you need a colder plug on e85? For most vehicles, the manufacturer-recommended spark plug and heat range is the best option. The spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. Consult your owner’s manual for the right spark plug for your car. I suppose it may make sense as each heat range step is roughly 75-100 degreed Celsius. Engines that tend to run hot need cold type plugs. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. 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