Our spark plugs have been improving engine performance since 1907. Follow this link for more information on Determining Correct Spark Plug Heat Range. Iridium “S” offers exceptional performance, even … Introduction. 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 Most spark plug manufacturers recommend that the tip temperature remain between 500° C … The only difference between plug RCJ6Y and RCJ8Y lies in their heat ranges. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. While the motor company only recommends use of their original equipment Harley brand spark plugs, the other brands often exceed original specification and will not void your warranty. Chainsaw & Cut-Off Saw Spark Plug Application Chart Use this Chainsaw Spark Plug Reference Chart to find the right spark plug for your gas powered chainsaw or cut-off saw. Spark Plugs . Unfortunately they differ between brands as to whether a higher number is hotter or colder. ... while the number is the heat range. Heat Range: Cold (59) Champion Spark Plug Guide (GIF) Champion Heat Range Guide (GIF) Champion Conversion Chart (GIF) Spark Plug Gapping Instructions (GIF) Autolite, Champion, NGK Cross Reference Chart (PDF) Item Details.750" Reach, 5/8" Hex Notes. Champion D-21's are the only plug I use. 2544 is the coldest plug in that plug family, and 2546 is the hotest. https://sparkpluglist.blogspot.com/2012/05/spark-plugs-cross-reference-list.html In these instances, a colder plug may be needed. Choose a brand from the list below then locate the spark plug for your specific saw by model number. For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. Champion makes a wide range of spark plugs, including the RCJ6Y and the RCJ8Y types. Most spark plug manufacturers recommend that the tip temperature remain between 500-850 degrees Celsius. platinum upgrade stock no. 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. Spark Plug Heat Range. Example a AR3935 (good street/strip plug) is hotter than a AR3932 plug which is very cold used for lots of nitrous. A: Please refer to the Tempest application chart.There are several things you will need to know as most engines have several different spark plugs approved. Racing Heat Range and Tuning Guide. March 2014. Longer lasting than platinum spark plugs, Iridium “S” plugs resist lead attack and provide better scavenging than standard platinum plug designs. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). Some NGK Racing Plugs are also available in half heat ranges. These charts contain a detailed example of the Champion Sales Symbol. The relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. It is the measure of how fast the spark plug tip dissipates combustion heat. For Champion, higher numbers are hotter. When dealing with Bosch spark plugs, the heat range is again designated by the number in the middle of the part code; a “W8DC” has a heat range of 8 and a “W6DC” a heat range of 6. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. Spark Plug Heat Range Cross Reference . Harley Spark Plug Cross-Reference Below is a cross-reference list of spark plugs for use in most Harley models. The optimal temperature to remove carbon deposits from the tip of the spark plug is 450º - 500ºC. You never forget your first Champion ®. 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