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Hotter heat ranges remain at higher temperatures longer than colder heat ranges. A = Thread Diameter = 14 mm G = Reach = .708" Conical Seat S = Plug Characteristic = Suppressor (Carbon) F = Plug Characteristic = Conical Seat 3 = Heat Range = Cold (Stock) 2 = Tip Configuration = Extended (Power) Tip C = Plug Characteristic = Copper Core Electrode 4 - Heat range ( 1=very COLD, 10 = veryHOT) 2 - standard electode design C - copper core The heat range is determined by the amount and length of the center core. Heat range is controlled by the length of the insulator nose. The temperature of the spark plug's firing end must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. It must do this in a controlled manner that will: 1. *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. Heat range is determined by the length of the electrode insulator and its ability to transfer heat. Ther shorter the core the hotter the plug will run. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is a hotter plug than 2974. A BKR7E-11 dissipates more heat over a larger surface area than the BKR5E-11. Most spark plug gapping tools are shaped in a circle. There is no industry standard for heat range; it is determined by the spark plug manufacturer. The operating temperature of a spark plug is the actual physical temperature at the tip of the spark plug within the running engine, normally between 500 and 800 °C (932 and 1,472 °F). In the following case the fourth digit is the heat range identifier. Heat range. The heat range is established by the distance the heat in the center electrode and insulator ceramic must travel before it contacts the steel body of the spark plug. This is called “thermal performance,” and is determined by the heat range selected. The number at … The heat range of a spark plug is the range in which the plug works well thermally. The highest temperature can be detected at the insulator tip end. Spark plugs with the improper heat range can cause sputtering. If the plug is too hot, it can result in Pre-Ignition. A spark plug is said to be “cold” if it can conduct more heat out of the spark plug tip and lower the tip’s temperature. Procedure. Very cold running plugs are undesirable … 2544 is the coldest plug in that plug family, and 2546 is the hotest. This is called "Thermal Performance", and is determined by the heat range selected. Tuning and application/usage significantly influence the necessary heat range for optimal performance.Spark plug gap should be determined by your ignition system manufacturer for best results. Other indicators of the amount of heat in the plug are the location of the heat color line on the shell threads and the ground wire. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. Spark Plug Heat Range. in this case - copper. A spark plug’s heat range has no relationship to the actual voltage transferred through the spark plug. Use a spark plug gapping tool to create the correct gap in the spark plugs before installing them. How is it determined? Generally speaking, the spark plugs with the longest ceramic inside the chamber are the hottest running plugs. Starting with part # RCJ7Y (heat range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (heat range 8). • HIGHER Heat Range • HOT PLUG Why is Heat Range Critical? Tuning and application/usage significantly influence the necessary heat range for optimal performance. - 3/4" reach, 14mm, gasket seat - Autolite #3924 or equivalent for normally aspirated, pump gas engines with a compression ratio between 9:1 and 11:1 Stay cool enough to avoid pre-ignition and/ or electrode destruction. Heat Range. The “5” heat range, or, the BKR5E-11 cannot dissipate as much heat making it a hotter spark plug. The heat range is a yardstick for selecting the correct spark plug. This paper shows that spark plugs only one range colder should be used when converting from gasoline to LP-gas operation. It is important to recognize there is no industry standard for heat range; it is determined by the spark plug manufacturer. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. A spark plug’s heat range has no relationship to the actual voltage transferred though the spark plug. 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