HEAT RANGE CHART Page 3 of 3 NON- PROJECTED TRUCK PLUG PLUGEZ START STAINLESS TRUCK STEEL 14mm .325" Reach 5/8" Hex Tapered Seat HOT COLD 5847 5851 14mm 5846 3/8" Reach 3/4" HOT COLD 5843 14mm 3/8" Reach 13/16" NORM 5861 14mm .460" Reach 5/8" Hex 5942 Tapered Seat HOT COLD 4113 4019 14mm 1/2" Reach 13/16" **Surface Gap HOT COLD 593 3 593 1 588 3 582 8 … Be the first to know about sales and promotions, The last digit in an Autolite part number represents the heat range. 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. 23 would be colder if it's a good part number. Autolite has 2544, 2545 and 2546 available. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Another way to prevent getting this page in the future is to use Privacy Pass. Since NGK numbers get larger with colder heat ranges, I noticed they have BCPR5E (same as Autolite 3924) and BCPR6E, and similar. A colder heat range spark plug has an insulator design with a shorter heat flow path to the metal shell of the plug. Shop Now . So 4 is a notch or two colder than stock. 5 NGK 7164 TR55IX Projected Stock Heat Range. Selecting the Right Heat Range. Heat Range Brand Part Number Design Number Tip Designation Special Notes 5 NGK 3951 TR55 Projected Stock Heat Range. Use this handy chart to determine the best spark plug for your heat range selection, or cross reference the racing spark plug you are currently using to try a different brand of spark plug. March 2014. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold). NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is … Performance & security by Cloudflare, Please complete the security check to access. I've got an older version of the Champion Iridiums in my car right now that uses a nickel ground, and I found out they are probably the wrong heat range too (not sure how I ended up buying them in the first place!) We are not Champion Spark Plugs USA. 2544 is the coldest plug in that plug family, and 2546 is the hotest. an autolite 24 is colder than a 26. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Please enable Cookies and reload the page. See cross reference chart for Autolite 65 and more than 80.000 other spark plugs. The 6 is only one heat range cooler than a 5 - I don't know if they offer a 7 or not in a 3/4" reach, gasketed, 5/8" hex plug or not. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. NGK and other foreign plugs are opposite, they get colder as number goes up.
I think you want an autolite #24 to cross with an AC-43T.

but today I went to my local Honda dealer and picked up a set of OEM NGK Laser Iridiums. autolite ®® technical information ar12 12 rv9yc r5674-7 ar13 13 rv9yc r5674-6 ar23 – rv9yc bpr6fs ar24 – rv12yc bpr6fs ar25 – rv15yc4 ur4 ar32 32 rf9yc ap8fs ar33 33 rf9yc ap7fs ar50 50 n59yd r5672a-10 ar51 51 n61yd/n6yc r5672a-9 ar52 52 n63yd/n7yc r5672a-8 ar53 53 n9yc bp6es ar72 72 j12yc r5670-7 ar73 73 j12yc r5670-6 ar74 74 j12yc r5670-6 Mon-Fri 8am-12am ET / Sat-Sun 9am-10pm ET. Some manufacturers numbering systems are opposite the other - for Champion, Autolite and Bosch, the higher the number, the hotter the plug. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Extened Gap. 2544 is the coldest plug in that plug family, and 2546 is the hotest. So for a normal, street-driven engine, that 3924 … COLD MEDIUM HOT Racing Plug Number Old Racing Plug Number Champion NGK ChampionIridiumPlugs.com is part of the SparkPlugs.com family, an authorized full line Champion dealer. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. 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. Autolite's numbering system does not have a standardized heat range identifier. Autolite has 2544, 2545 and 2546 available. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). Heat range is controlled by the length of the insulator nose. Cloudflare Ray ID: 609665c5499e3573 2544 is the coldest plug in that plug family, and 2546 is the hotest. Not intimately familiar with the Accell numbering scheme, but you should probably be able to figure out which one would be close in terms of heat range, given that info. Eventually, it's cooled by the radiator. A "stock heat range" plug would be a 5 or 6 (higher is hotter). Autolite has 2544, 2545 and 2546 available. Autolite has 2544, 2545 and 2546 available. Rules for selecting the correct plug are to follow manufacturer’s specifications. Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search Departments; Brands; Savings Central; Call Us. E3 does not have a standardized heat range identifier. 5 (NGK) Denso 5325 IT-16 Projected Sotck Heat Range. 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. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Whether the theory appliess to Autolite vs NGK i dunno. Just looking for feedback, good and bad, of what you run in your combo. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Inside … 2544 is the coldest plug in that plug family, and 2546 is the hotest. The higher the number, the hotter the plug. Autolite has 2544, 2545 and 2546 available. For example, take the 254x plug series. Typically the heat range for NGK Spark Plugs varies from 2-11. Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. Ngk goes the other way and the lower the number the hotter the plug. 181 replacement spark plugs for Autolite 65. One thing i was told about NGK plugs vs Champions, is that Champions crossover is not an accurate heat ranged plug, and in 2 stroke application this can cause issues. 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. 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