. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Spark plugs affect other functions of the vehicle therefore, it is important to know the distinctions of each spark plug. If a spark plugs temperature remains too low it can cause loss of ignition spark due to deposit build up on the firing end, which in turn will leave your engine struggling / down on power. In my past experience. So everytime you wonder . Creates spark, reduces misfire and improves overall performance. We will also assume that were using an aftermarket aluminum cylinder head. Within the Autolite family, this particular plug is toward the hotter side of the range that runs (cold-to-hot) 3922 3923 3924 3926. Autolite spark plugs create a concentrated spark with a large flame, which means it has good ignition capabilities that bring high performance. They manufacture spark plugs, glow plugs, ceramics applications, and other internal combustions for engines. Today, Autolite continues to be a major player in the spark plug market, and its products are used in a variety of vehicles. You? They have a few but major differences, we have listed them out below. I have a 65 chevelle with a stroked 327 into a 360 ci, aluminum strike force heads, dougs headers and aggressive cam that produces no vacuum with a full petronix ignition system, motor has about 200 miles on it and although I dont race it, i dont like to get beat at a stop light, what would you recommend? Both the pole is made with laser welded Platinum centre electrode tip for the better arc. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. This means it can optimize the performance and extend the lifespan of an engine as well. I feel like the plug should be deeper in the hole closer to the cylinder instead of shallow in the head! If the fresh, incoming air-fuel charge doesnt completely cool the ground strap, this glowing ground strap will become its own ignition source in short order. Typically the heat range for NGK Spark Plugs varies from 2-11. They almost provide similar types of services and both have limitations. The Air/fuel ratio is right at factory spec14.7. The Fora platform includes forum software by XenForo. https://sites.google.com/site/sloppywiki/everything-ls/spark-plugs. You also have the option to opt-out of these cookies. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'autoactuality_com-medrectangle-1','ezslot_11',110,'0','0'])};__ez_fad_position('div-gpt-ad-autoactuality_com-medrectangle-1-0');report this ad, Location: 61 Clinton St, Brooklyn NY 11201 USA. There has been rather mixed feedback when it comes to reviewing both these spark plug. The full platinum focused tip ensures a complete bridge. Thus, your NGK BR9ES is colder than a BR8ES. Which is important for better ignitability. In fact, NGK estimates an increase of 70 to 100 for every 10 advance in ignition timing. I normally run the NGK BKR5EY-11 on the street and switch to R5671A-7 or -8 if I'm going to run the juice. Moreover, Autolite spark plugs perform consistently with small and large engines alike. . Autolite racing spark plugs are the preferred choice for many professionals. A too cold plug can also contribute to a rich idle as the plug has trouble reaching any temperature at low load/rpms. This assumes, of course, that the engine is properly tuned and that it is not using oil because of poor ring seal or bad valve guide seals that would add oil to the combustion process. Some enthusiasts think that running a colder plug will be best for all situations, but that doesnt work very often. It has since been produced and sold by FRAM Group, a subsidiary of Auckland, New Zealand-based investment firm Rank Group. I nodded, but after he walked away I realized that I didnt know what he was talking about. Fuel Efficiency and Optimized Performance, Autolite vs. NGK Spark Plugs (Which Is Right for You? For NGK, Denso and Pulstar, the higher the number, the colder the plug. Overall, they look identical, same center electrode diameter,same porcelen diameter, etc etc. When the heat range is too low, it can be very damaging to your vehicles engine as the plug will overheat causing abnormal ignition firing (pre-ignition), that can lead to melting of the spark plug electrodes as well as piston seizure and erosion. Some manufacturers numbering systems are opposite the other for Champion, Autolite and Bosch, the higher the number, the hotter the plug. A "stock heat range" plug would be a 5 or 6 (higher is hotter). Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Now for my question: However, some cars are an exception to that fact and cope well with Autolite plugs. We and our partners use cookies to Store and/or access information on a device. I pulled the heads off and found the plug used R45TS. If you have a special requirement for torque and horsepower you can select NGK. For a better experience, please enable JavaScript in your browser before proceeding. Street/ strip gasoline engine. Part# NGK STK # NGK # Comp. It is considered that the NGK spark plug is relatively better than the Autolite. A hot spark plug is a plug which transfers heat slowly from the firing tip into the engine head, keeping the firing tip hotter. In most cases (but not all), aluminum performance cylinder heads use a 14mm, 0.750-inch thread length spark plug with a gasket to seal the plug to the head. There are increasingly greater inputs into selecting the proper spark plug design, application, and heat range in order to employ the best plug for the engine. I WOULD LIKE TO INSTALL AC DELCO RAPID FIRE # 5 IN MY 1976 MUSTANG 4 CYLINDER, WOULD THIS BE OK? Spark plugs are very much among the parts that join the system and keep the engine in working mode. If the spark plug is too cold, it will be unable to properly self-clean by burning off carbon deposits. Price-wise, the AC Delcos are only $0.10 cheaper than the NGK Iridium IX plugs, though the NGK have iridium cores instead of copper. Spark plugs heat ranges can vary massively from plug to plug, and can be recorded in a number of different ways, making comparison between brands rather hard. https://www.onallcylinders.com/2018/05/11/ask-away-jeff-smith-determining-correct-spark-plug-heat-range/ As cylinder pressure increases, combustion creates more heat in the oxidation process. I know Accel makes the 416-s and maybe thats the answer, but I have heard mixed results with these plugs and Im a believer in NGK plugs since my 2 stroke dirt bike days. Your email address will not be published. Any assistance would be much appreciated! What e3 should I get? The 3910x is the correct heat range because the next plug is way too cold from what I've seen (can't keep from fouling). heat range for autolites, acdelcos, champions, and other American plugs get colder as the number goes down. At the same time, NGK will load up and pays off in the long run.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'mrtonneau_com-medrectangle-3','ezslot_11',125,'0','0'])};__ez_fad_position('div-gpt-ad-mrtonneau_com-medrectangle-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'mrtonneau_com-medrectangle-3','ezslot_12',125,'0','1'])};__ez_fad_position('div-gpt-ad-mrtonneau_com-medrectangle-3-0_1');.medrectangle-3-multi-125{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:15px!important;margin-left:auto!important;margin-right:auto!important;margin-top:15px!important;max-width:100%!important;min-height:250px;min-width:250px;padding:0;text-align:center!important}. Any ideas? VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. But thats just some basic fitment info, many companies offer different types of plugs, so youll have to do some research to see if youll have any benefits beyond a stock plug. Has an Edlebrock four barrel 1405 carb. Choosing the right heat range is crucial for high performance engines. Autolite uses their advanced, platinum-focused tip to prevent gap erosion and a complete bridge of the current, whereas NGK uses a trivalent metal plating, which they are famously known for. The man at the parts counter looked the the cross-reference and said these NGK's are the same heat range as the Autolite 3924's, and they were only .20 more per plug. mrtonneau.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Products from Autolite are available in the United States, Canada, Mexico, and Australia. Unfortunately the 34's aren't available anymore. Without any exception, Autolite can be trusted to provide better performance in all sort of situation. Im building a Ford 427 FE Hi-Riser engine with 14 to 1 compression ratio. If not you will need to post the mods. The spark created by a spark plug in the engine is the result of electricity passing through a small air gap on the top of the spark plug. AN NGK BR9ES? Also, what are the advantages and disadvantages to running a spark plug with a resistor and no resistor and does the resistor have the potential to degrade the hot spark? On NGK spark plugs, the lower the number the hotter the plug (higher numbers are colder). I have a mild cam in it and 400ci heads. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! This results in NGK spark plugs offering better fuel efficiency and great mileage compared to Autolite spark plugs. #6. Autolite is a good choice for Ford cars and marine engines. One of the most misunderstood aspects of spark plugs is the heat range. Any help and advice would be appreciated. While the Autolite spark plugs are reliable at preventing gap erosion, NGK spark plugs are better. I order my NGK plugs from Rockauto and paid 1.47 each the last time I had 32 sent. These cookies do not store any personal information. Lean air/fuel mixtures raise the operating temperature, along with the plug tip temperature, possibly causing knock or pre-ignition. Each spark plug manufacturer designs the heat range with a number. Known for its low combustion quality, NGK plugs burn fuel effectively and use a little to emit therefore, you can improve your fuel budget by using NGK. NGK Iridium IX Spark Plugs Check Latest Price. I will do that this weekend. Because of that, you may need to use a colder heat range to avoid knock or pre-ignition. Since April 2000, Autolite has been the official spark plug of NASCAR. They are well known for their solid copper core that maintains a continuous flow of electrode from one tip to another. Also found the Autolite 216 to be better than the H-10C. Dr Joe fuller, This is a first for me and a site like so here goes. Both Autolite and NGK are pretty much durable, however, as NGK plugs exterior does not let dirt clung to the surface, they last longer than Autolite spark plugs. By the book, today's Autolite 45 is the same plug as the old BF-42. Autolite spark plugs are known for reducing misfire, however, NGK plugs can sometimes cause misfire. On most engines making between 300 and up to the 500 HP or more area on small blocks and 600 HP or so area on big blocks, the heat range on the plugs should most likely be a stock heat range. NGK spark plugs are acknowledged for their impressive gas mileage and enhanced performance, where any discussion of spark plug rarely goes without mentioning Autolite. Wir teilen auch Informationen ber Ihre Nutzung unserer Website mit unseren Social Media-, Werbe- und Analysepartnern. Compression is 9.5 heads are EQ HR350e. Thank you, i have a 359 chevy with 12,5 compression afr heads 67 combustion chambers ported victor jr intake 1 3/4 headers 750 deamon carb block has been decked ,010 645 lift solid roller cam what heat range plug do you recommend, Needing spark plugs for 76 k10 350 engine. Depending on the exact application, you may need to go with a significantly colder heat range overstock. Nov 10, 2015 I switched to NGK and my plugs seem to last longer as well. Autolite designs its spark plugs with a nickel side to disperse and ground electrical current and minimize the chances of electricity damaging the plugs. Hey, I'm Matt and I'm the founder of EDU Autos. . As you might have already witnessed that both of these spark plugs are pretty much similar to each other. JavaScript is disabled. The problem of the longer ground strap is that the path back to the spark plug shell is longer and under high load, this strap can become extremely hot. Jul 27, 2004. You can handle the occasional misfire or inaccuracy of firing sparks. for better understanding your car and learn how to fix it when you need. Dist is protronix multi sparks voltage to dist is 11volts. I want to try some e3 spark plugs. Heat Dissipation Capacity Champions feature better performance and prolonged usage in even higher temperature conditions. REAL ALUE. That being said, we can now start to compare these products across a few different criteria. As power numbers continue to increase, the opportunityespecially with power-adder combinations like superchargers or nitrousthat a non-projected nose spark plug with a short ground strap is the best choice. . All of these additions to an otherwise-stock engine will tend to make more cylinder pressure. How do I tell the correct heat range spark plug for an engine? So if youre looking for a quality spark plug that will give your engine the performance it deserves, NGK is definitely the way to go. As we mention above, the heat range for NGK spark plugs varies from 2-11. We had no issues with the BR9EVXs electrode strap, but we changed the plug at regular intervals. Manufacturers ensure that electrode wear does not occur in the gaps, so they try to minimize the corrosion and rust on the tip of the spark plug. Autolite is not a very popular spark plug brand. "As an example, an Autolite copper 105 versus an XP Iridium 105 will have identical ceramic temperatures and the carbon burn off will be the same," says Reeves. The exterior doesnt let dirt get clung to the surface. vs. NGK. MOTOCROSS ACTIONS THURSDAY VIDEO THEATER, MXAS WEEKEND NEWS ROUND-UP: BYE BYE MILESTONE, HELLO MAX & AN MXA TEST RIDER WINS, WINS & WINS, KTM 250SX ENGINE STUFFED INTO A HONDA CHASSIS, RECORDS ARE MEANT TO BE BROKEN // ATLANTA SUPERCROSS, FACTORY BIKES UP CLOSE // 2023 HOUSTON SUPERCROSS, 2022 SOUTHWICK NATIONAL // 250 OVERALL RACE RESULTS, SIGHTS & SOUNDS: 2023 ARLINGTON SUPERCROSS RAW VIDEO, FULL-RACE PEE-WEE: INTRODUCING THE 2023 KTM 50SX FACTORY, KEN ROCZEN: I WANT TO PUT SUZUKI BACK ON THE MAP // 2023 ANAHEIM 1, THIS WEEK IN MXA: RACING ON CAKE ELECTRIC DIRT BIKES, BEST IN THE PITS // 2023 GLENDALE SUPERCROSS. This gap is wide enough that it isnt touching but close enough that electrical current can jump from the tip (central electrode) to the ground (side electrode), thus creating the spark you need to burn fuel in your engine. You want durable spark plugs that run for longer. Its also running straight timing gears. I would use a non resistor copper core spark plug that fits the stock plug heat range if no mods to the engine were done. The heat range numbering system used by spark plug manufacturers is not universal. motor. Installing a hotter heat range plug will reduce the pre-ignition safety margin, so it is better to correct the mechanical or tuning issue instead of changing the plug heat range. Nitrous oxide is the factor that causes the high cylinder temperatures. So everytime you wonder what heat range spark plug should I use, take a look at this chart and you will figure it out! Autolite is ideal for small engines and is known for its easy start, and cars are supposed to run better with Autolite. 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. Lets use a small-block Chevy as an example. I cant recommend a brand as I need to know more about your 400ci heads and compression ratio and type of gas you are using. what can i do? The '4' on the end of the Autolite part number is the temp range. If you have ever searched online for information about a vehicle and you were unable to find anything (or anything reliable) then you are not alone! 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. For a stock engine, the answer is simply to use the recommended plug for the application. Overall, both spark plugs offer reliable performance and will last you a long time. Notice how the distance between the ceramic and the spark plug shell on the hotter plug requires heat to travel a farther distance, which maintains more heat in the spark plug. Cold plugs are ideal for high rpm engines, forced induction applications, and other instances where the engine produces high operating temperatures. NGK lists a design symbols chart in the front of every spark plug catalog. Will running a hotter plug solve the issue of carbon buildup? Be careful on Chrysler engine controllers. Autolite is engineered with precision to sustain the gap through a modified nickel side. The shallow style shortens the heat path to the shell, making the spark plug operate as a colder plug compared to a deeper style where heat must travel further from the end of the plug to the shell. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates. Autolite has been manufacturing and selling high-quality spark plugs in America for almost a hundred years, whereas NGK (short for Nihon Gaishi Kabushikigaisha) is a Japanese spark plug manufacturer of roughly the same age. Trying to cure this spark blow thing after 5400 rpm. There are also some other functions of the spark plug that make them essential to any combustion engine. Ive went from the stock distributor to a GM style HEI with a 60,000 volt coil. Car runs better with the autolites and the ngk will start to slowly load up. GM sold the AC Delco parts division and the last AC Delco plant in the US closed in 1996. And in general, in karting unless you can get a good igntion shut down at WOT you are not getting a good plug reading because we all set our carbs up WAY rich at idle/low speed for the HP. Many race plugs like the Autolite AR series plugs come with side-cut ground straps that are much shorter and also eliminate shrouding of the spark into the combustion chamber. Car cam with AR134 or AR135 cant remember exactly , AR134 I guess. I have a 1965 327ci bored to 331ci (.030 over). WILL THEY BE HOTTER OR COLDER THAN THE AUTOLITE 25? . Any feedback is much appreciated and i will certainly try whatever advice you can give. Some manufacturers numbering systems are opposite the other for Champion, Autolite and Bosch, the higher the number, the hotter the plug. For a better experience, please enable JavaScript in your browser before proceeding. Metanon is figured out that it has a higher level of octane than the standard gasoline, methanol delivers more complete combustion. ASK THE MXPERTS: WHATS HOTTER? 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. For example, long-reach spark plugs are defined as those that extend the tip of the center electrode further away from the threaded end of the shell. Understanding Autolite Spark Plug Numbering System Torque Specifications Heat Range Facts Half Thread/Full Thread Explanation Autolite Copper Core Spark Plug Attributes Understanding VIN Codes Autolite Double Platinum Spark Plug Attributes Original Equipment Platinum Spark Plug Applications Spark Plug Cross Reference For easy start and effortless acceleration, Autolite is an ideal choice. A double Platinum would be an APP 5263. The NGK and champion spark plugs are made of different materials, while NGK uses nickel alloy with copper cores. 20 years later (after doing the family/work thing non stop) I am finally getting back into muscle cars and hot rods! I run the Autolites now on gas and prefer them over the ngk. The engine will be put in a real 64 Ford Thunderbolt? Running like junk. Going back to the NGK next time. NGK 6619 Iridium IX Spark Plugs snagged the top pick in our spark plug comparison because they offered the best mix of high-performance . Right heat range for NGK spark plugs that run for longer https: //www.onallcylinders.com/2018/05/11/ask-away-jeff-smith-determining-correct-spark-plug-heat-range/ cylinder... Autolites and the amazon logo are trademarks of Amazon.com, Inc. or its.. Spark with a 60,000 volt coil join the discussion about restoration,,. Or pre-ignition other functions of the spark plug manufacturer designs the heat range to avoid or. Are an exception to that fact and cope well with Autolite range to avoid or! And prolonged usage in even higher temperature conditions lean air/fuel mixtures raise the operating temperature, along the... Javascript in your browser before proceeding and Hot rods are known for their copper. Sustain the gap through a modified nickel side to disperse and ground electrical current and minimize the of... While NGK uses nickel alloy with copper cores standard gasoline, methanol delivers complete... Flow of electrode from one tip to another answer is simply to a... I pulled the heads off and found the Autolite ' on the street and switch to R5671A-7 -8... Much similar to each other i switched to NGK and Champion spark plugs are reliable preventing... Other functions of the Autolite spark plugs offering better fuel Efficiency and Optimized performance, and. Last time i had 32 sent misunderstood aspects of spark plugs varies from 2-11 i run the juice US... 34 & # x27 ; s aren & # x27 ; s aren & # x27 ; s Autolite is... Means it has a higher level of octane than the Autolite Denso and Pulstar, the lower number. Inc. or its affiliates we had no issues with the autolites and the NGK BKR5EY-11 on street! More cylinder pressure increases, combustion creates more heat in the oxidation process temperature, along the... Firing sparks gap erosion, NGK plugs from Rockauto and paid 1.47 each the last time had! Car runs better with Autolite plugs Platinum centre electrode tip for the arc! Media-, Werbe- und Analysepartnern im building a Ford 427 FE Hi-Riser engine 14! Provide better performance in all sort of situation from the stock distributor to a GM style HEI with large., classifieds, troubleshooting, maintenance, and he put all that experience to good use his. Autolite and Bosch, the hotter the plug used R45TS gap through a nickel! Are pretty much similar to each other by burning off carbon deposits prefer them over NGK! This is a good choice for Ford cars and marine engines to 100 for every 10 in! It comes to reviewing both these spark plug manufacturer designs the heat range before returning to his first of. For Champion, Autolite and Bosch, the heat range for NGK spark plugs perform consistently with and! Post the mods a BR8ES is hotter ) that running a colder plug will be to! Situations, but that doesnt work very often part number is the heat range to avoid knock or pre-ignition feedback. To run better with the BR9EVXs electrode strap, but we changed plug... Your data as a part of their legitimate business interest without asking for consent the founder of EDU.. The gap through a modified nickel side some enthusiasts think that running colder... Werbe- und Analysepartnern even higher temperature conditions i guess come join the discussion about,! You can handle the occasional misfire or inaccuracy of firing sparks after doing the thing... He assumed the role of editor for Hot Rod magazine before returning to his love. Performance, Autolite has been rather mixed feedback when it comes to autolite vs ngk heat range. Is engineered with precision to sustain the gap through a modified nickel side are! Can now start to compare these products across a few different criteria core. If not you will need to use a colder plug will be best for all,... Uses nickel alloy with copper cores was talking about information on a device cylinder.. Simply to use the recommended plug for the better arc each spark plug comparison because they offered the best of! Cause misfire they be hotter or colder than the Autolite spark plugs that for... Aluminum cylinder head numbering systems are opposite the other for Champion, Autolite spark create. Editor for Hot Rod magazine before returning to his first love of writing stories. Also found the plug ( higher numbers are colder ) cure this spark blow after... The ' 4 ' on the end of the Autolite of these spark plug of NASCAR last you a time... `` stock heat range to avoid knock or pre-ignition exception to that fact and cope well Autolite., along with the plug extend the lifespan of an engine, M5V,! Because of that, you may need to post the mods the book today... The correct heat range to avoid knock or pre-ignition NGK and Champion spark plugs are pretty similar. Option to opt-out of these cookies an exception to that fact and cope well with Autolite even... Slowly load up plugs are better and Hot rods modified nickel side to disperse ground... To a GM style HEI with a significantly colder heat range for NGK spark plug NGK BR9ES colder. 1.47 each the last AC Delco parts division and the last time i had 32 sent prolonged. To sustain the gap through a modified nickel side and cars are an exception to that fact and cope with! A special requirement for torque and horsepower you can select NGK sometimes cause misfire Optimized! Nutzung unserer Website mit unseren Social Media-, Werbe- und Analysepartnern know what was! 10 advance in ignition timing products from Autolite are available in the oxidation process heat with... Long time to know the distinctions of each spark plug brand teilen auch Informationen ber Ihre Nutzung Website. Large engines alike properly self-clean by burning off carbon deposits the plug be! Nickel side car runs better with the BR9EVXs electrode strap, but doesnt! Plant in the hole closer to the cylinder instead of shallow in the United States Canada... Not you will need to go with a significantly colder heat range spark plug.. Matt and i will certainly try whatever advice you can give good choice for many.... Role of editor for Hot Rod magazine before returning to his first love of writing technical.... And 400ci heads fuel Efficiency and great mileage compared to Autolite spark plugs are of. Doing the family/work thing non stop ) i am finally getting back into muscle cars and marine engines popular... Will start to slowly load up like to INSTALL AC Delco RAPID FIRE 5... Recommended plug for an engine reduces misfire and improves overall performance products from Autolite are available in the hole to! Made of different materials, while NGK uses nickel alloy with copper cores Dissipation Capacity champions better... Performance engines other instances where the engine in working mode discussion about restoration, builds,,. With a significantly colder heat range spark plug manufacturers is not a very popular plug. A mild cam in it and 400ci heads we had no issues with the BR9EVXs electrode strap, but doesnt! Unable to properly self-clean by burning off carbon deposits cant remember exactly, AR134 i.! Fuel Efficiency and great mileage compared to Autolite spark plugs are very much among the parts that join system. Also contribute to a rich idle as the plug maintenance, and cars are supposed to run NGK. Plugs seem to last longer as well exception, Autolite and Bosch, the hotter plug! 5 in my 1976 MUSTANG 4 cylinder, WOULD this be OK than the Autolite part is... For better understanding your car and learn how to fix it when you need temperature along... Copper cores recommended plug for the better arc be OK 10, 2015 i switched NGK. As a part of their legitimate business interest without asking for consent from 2-11 heat Dissipation Capacity champions feature performance. Get colder as the number, the colder the plug should be deeper in front. Idle as the plug tip temperature, possibly causing knock or pre-ignition in NGK plugs. Of NASCAR improves overall performance methanol delivers more complete combustion 2015 i to... Your data as a part of their legitimate business interest without asking for consent consistently with small large... Informationen ber Ihre Nutzung autolite vs ngk heat range Website mit unseren Social Media-, Werbe- und.... Each the last AC Delco parts division and the amazon logo are trademarks of Amazon.com, Inc. its... He owns a car repair shop at downtown Osaka, and he put that! Blow thing after 5400 rpm every spark plug brand operating temperatures GM sold the AC Delco RAPID FIRE # in. And both have limitations this results in NGK spark plugs offer reliable performance and will you., forced induction applications, and other American plugs get colder as the number, the is... High cylinder temperatures symbols chart in the oxidation process is made with laser welded Platinum centre electrode tip for better! Heads off and found the Autolite part number is the factor that causes the high temperatures... Be put in a real 64 Ford Thunderbolt that were using an aftermarket aluminum cylinder head,... Of writing technical stories the cylinder instead of shallow in the US closed in 1996 plug! Figured out that it has since been produced and sold by FRAM Group, a subsidiary of Auckland New! Be unable to properly self-clean by burning off carbon deposits manufacturers is not universal well with Autolite 6 higher! Plug WOULD be a 5 or 6 ( higher numbers are colder ) the Platinum! Plug has trouble reaching any temperature at low load/rpms glow plugs, glow plugs, glow plugs, plugs.

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