2544 is the coldest plug in that plug family, and 2546 is the hotest. 5 (NGK) AC Delco R42CLTS6 R42CLTS6 Projected Stock Heat Range. A colder heat range spark plug has an insulator design with a shorter heat flow path to the metal shell of the plug. 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. At this time the colder Pulstar heat range 2 is available in 3 designs, BE-2HT8 and HE-2HT10 and SE-2T8. Mon-Fri 8am-12am ET / Sat-Sun 9am-10pm ET. Eventually, it's cooled by the radiator. Autolite has 2544, 2545 and 2546 available. You may need to download version 2.0 now from the Chrome Web Store. For example, take the 254x plug series. For example, take the 254x plug series. The last digit in an Autolite part number represents the heat range within a plug family. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. See cross reference chart for Autolite 65 and more than 80.000 other spark plugs. 2. 2544 is the coldest plug in that plug family, and 2546 is the hotest. 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). Autolite's numbering system does not have a standardized heat range identifier. The '4' on the end of the Autolite part number is the temp range. 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. COLD MEDIUM HOT Racing Plug Number Old Racing Plug Number Champion NGK NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. For example, take the 254x plug series. but today I went to my local Honda dealer and picked up a set of OEM NGK Laser Iridiums. The heat range numbering system used by spark plug manufacturers is not universal. Mon-Fri 8am-12am ET / Sat-Sun 9am-10pm ET. • Autolite has 2544, 2545 and 2546 available. Be the first to know about sales and promotions, The last digit in an Autolite part number represents the heat range. Autolite AR133 2 Heat Ranges Colder NGK Forced Induction NGK-Non Projected Electrode Specifications: Thread Size= 14mm Hex Size= .625 Reach= .75 Seat Type= Electrode= V-Power R5673-8 Stock Number 3249 R5673–9 Stock Number 3442 for tons of boost and power. Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA Choosing the right heat range is crucial for high performance engines. Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. 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!) IRIDIUM. 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. Spark Plug Heat Range Cross Reference . To contact them, click here. 181 replacement spark plugs for Autolite 65. 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. Specifically designed to reduce quenching; NGK spark plugs provide better ignitability and quicker starts. Example a R5671A-7 (a good street/strip plug) is a cold plug where a R5671A-10 is a very cold plug used for large 400hp and up nitrous and other power adder applications) Autolite Heat Ranges - The larger the last digit in the part number, the hotter the plug is. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is … Whether the theory appliess to Autolite vs NGK i dunno. Another way to prevent getting this page in the future is to use Privacy Pass. Find Autolite Spark Plugs with 5 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! Autolite has 2544, 2545 and 2546 available. From there, it's transferred to the cylinder head. Autolite indicates the heat range with the last digit of the part number. 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. an autolite 24 is colder than a 26. Find Autolite Spark Plugs 4 Manufacturer Heat Range, 14mm Spark Plug Thread Size and get Free Shipping on Orders Over $99 at Summit Racing! 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. We are not Champion Spark Plugs USA. Extened Gap. Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search Departments; Brands; Savings Central; Call Us. I know of at least one person that has burned up a Dirtbike and had his mechanic attribute it to champion plugs instead of the recommended NGKs. 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. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is … 2544 is the coldest plug in that plug family, and 2546 is the hotest. The higher the number, the hotter the plug. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. ChampionIridiumPlugs.com is part of the SparkPlugs.com family, an authorized full line Champion dealer. heat range for autolites, acdelcos, champions, and other American plugs get colder as the number goes down. Just looking for feedback, good and bad, of what you run in your combo. As a result, less heat stays in the ceramic firing end and more is dissipated to the engine. Pulstar heat range 2 is comparable to NGK heat ranges 8-9, Denso heat ranges 24-27 and Champion heat ranges 4-6/59-63. NGK Heat Ranges - The larger the number after the dash the colder the plug is. March 2014. Then, it's transferred to the coolant passages. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. Heat is transferred from the insulator nose to the metal shell of the spark plug. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Rules for selecting the correct plug are to follow manufacturer’s specifications. 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. Extended Gap. Other companies like NGK and Denso both use higher numbers to denote a colder plug while Autolite, Champion, and Bosch use higher numbers for hotter plugs. Autolite's heat range is the last digit and the lower the number the colder it is. Extended Gap. Cloudflare Ray ID: 609665c5499e3573 So 4 is a notch or two colder than stock. For example, 3923 has a heat range of 3. 2544 is the coldest plug in that plug family, and 2546 is the hotest. 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 Selecting the Right Heat Range. The lower the number, the colder the plug. The key to a heat range selection is related to selecting a plug that will efficiently burn-off carbon deposits from the center ceramic during normal use of the engine. Summit Racing Gift Cards - Always the Perfect Gift! 2544 is the coldest plug in that plug family, and 2546 is the hotest. Autolite engineers have developed plugs in many heat ranges to suit all engine applications. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Autolite has 2544, 2545 and 2546 available. Inside … Shop Now . E3 does not have a standardized heat range identifier. Autolite has 2544, 2545 and 2546 available. NGK is the world’s largest OE supplier and manufacturer of spark plugs. 23 would be colder if it's a good part number. Performance & security by Cloudflare, Please complete the security check to access. IRIDIUM. A "stock heat range" plug would be a 5 or 6 (higher is hotter). 2544 is the coldest plug in that plug family, and 2546 is the hotest. 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. Autolite has 2544, 2545 and 2546 available. So for a normal, street-driven engine, that 3924 … 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.

For NGK, Denso and Pulstar, the higher the number, the colder the plug. Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search Departments; Brands; Savings Central; Call Us. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). For instance, starting with part # 24 (heat range 4), if you want a colder plug you would use part # 23 (heat range 3), for a hotter plug you would use part # 25 (heat range 5). 5 NGK 7164 TR55IX Projected Stock Heat Range. Heat range is controlled by the length of the insulator nose. They range from COLD through MEDIUM; and HOT to EXTREMELY HOT. • Inside the United States 1-800-230-3030 1-800-230-3030. Ngk goes the other way and the lower the number the hotter the plug. 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 … Known for durability and performance, NGK manufactures OE spark plugs for inboard engines, over 90% of outboard engines and almost 100% of personal water crafts. Your IP: 103.58.102.37 However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is … Some manufacturers numbering systems are opposite the other - for Champion, Autolite and Bosch, the higher the number, the hotter the plug. Since NGK numbers get larger with colder heat ranges, I noticed they have BCPR5E (same as Autolite 3924) and BCPR6E, and similar. Aftermarket aluminum heads (TFS, Edelbrock, AFR, Canfield, Brodix) NGK Forced Induction R5671-A8 Stock Number 4554, 1 heat range … Autolite ® Spark Plug Heat Range Chart Tabla de grados térmicos de bujías Autolite ® A B C D E F G H I J. THREAD IRIDIum XP 5 (NGK) Denso 5325 IT-16 Projected Sotck Heat Range. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. Typically the heat range for NGK Spark Plugs varies from 2-11. FAST FREE SHIPPING on Orders Over $99! 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. Please enable Cookies and reload the page. Heat Range Brand Part Number Design Number Tip Designation Special Notes 5 NGK 3951 TR55 Projected Stock Heat Range. 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