To contact them, click here. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. The heat range of a spark plug is the range in which the plug works well thermally. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. The heat range of a spark plug is indicated by the number in the plug’s identification sequence. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. Heat rating and heat flow path of NGK Spark Plugs resistor spark plugs The primary method used to do this is by altering the internal length of the core nose. Spark plugs with high heat dispersal are referred to as cold, while plugs with less heat-dissipating characteristics are known as hot. For example, Champion spark plugs indicate the heat range in the middle of the plug number. In addition, the alloy compositions in the electrodes can be changed. If you are unsure of the correct heat range to use, always start with a colder spark plug. Running too cold a plug can only cause it to foul out, whereas running too hot a plug can cause severe engine damage. *When a spark plug is referred to as a “cold plug”, it is one that transfers heat rapidly from the firing tip into the engine head, keeping the firing tip cooler. Where is E3? When making spark plug heat range changes, it is better to err on the side of too cold a plug. As a result, less heat stays in the ceramic firing end and more is dissipated to the engine. A good rule of thumb is, one heat range colder for every 75–100hp added. Other spark plug manufacturers place the heat range at the end of the part number. A colder heat range spark plug has an insulator design with a shorter heat flow path to the metal shell of the plug. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. The heat range of a spark plug is the range in which the plug works well thermally. Within that range it is cool enough to avoid pre-ignition and plug tip overheating (which can cause engine damage), while still hot enough to burn off combustion deposits that cause fouling. *A “hot plug” has a much slower rate of heat transfer, which keeps the firing tip hotter. Other factors effecting Heat Range are the If the plug is too cold, the plug will Heat is conducted away from the firing tip through the (1) insulator to (2) the spark plug shell to (3) the cylinder head. The spark plug is heated during combustion and must dissipate that heat to the cylinder head at a certain rate to avoid overheating the ceramic firing end. NGK.com specializes in hard to find NGK products. NGK spark plugs use a heat range index ranging from 2 to 12 with 2 being the hottest spark plug and 12 being the coldest. Thus, heat ranges are primarily controlled by the length of the insulator through which the heat must travel before escaping to the cylinder head. The heat range of a spark plug is typically specified as a number, with some manufacturers using ascending numbers for hotter plugs, and others doing the opposite – using ascending numbers for colder plugs. What is Spark Plug Heat Range? The heat range of a spark plug is indicated by a code within the plug number imprinted on the side of the spark plug Two technician are discussing waste spark ignition systems. 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