While it is a platinum plug – that had little to do with its failure. A “hot” spark plug lengthens the depth of the ceramic which lengthens the distance from the center electrode end of the plug to where it contacts the spark plug shell. Pre-ignition is where combustion initiates before the spark plug fires as the result of an extremely hot, glowing ignition source in the chamber. Aging batteries sometimes provide inconsistent voltages which can adversely affect the performance of the engine and cause premature wear of the spark plugs. • A tuner will often spec a heat range one to three steps colder than the stock heat range. How spark plugs work. The way an engine is used has a big effect on choosing the proper heat range. However, you can upgrade to either double platinum spark plugs or iridium spark plugs. MSD’s Spark Guard is dielectric grease used to protect the boot from sticking to the spark plug and minimize errant spark leakage. Fine-wire plugs were designed for use in late model engines that are tasked with the seemingly ridiculous goal of lasting for 100,000 miles in a production engine. The path for heat to escape from the center ceramic to the plug’s steel body is at the very bottom of the steel shell. ACDelco 41-162 19417055 Professional Iridium Spark Plugs (Four Plugs) Description. We should also define the term “copper core” when talking about spark plugs. 99 (Right) This melted plug was destroyed when the nitrous system went lean. The 10 Best Denso Iridium Spark Plugs 1,641 reviews scanned The 10 Best Bosch Iridium Spark Plugs 6,836 reviews scanned Product comparison table # Product Name Popularity Score Professional Iridium Spark Plug; ACDelco Professional Iridium Spark Plugs are a high quality replacement for many vehicles on the road today. That’s walking a very fine line. (Right) Sometimes a shorter spark plug can improve clearance with tight-fitting headers. While a standard gap of 0.035-inch works well for naturally-aspirated engines, if the plug wires are in good shape and the ignition is strong enough, many naturally-aspirated engines might benefit from a slightly wider gap of 0.045 to perhaps 0.050-inch. So, we get a very strong, concentrated spark. • The plug on the right is a much hotter plug with the ceramic connecting with the outer shell much deeper. Get your car running the way it used to with new copper, platinum, or iridium spark plugs from AutoZone. For tuning these engines, it’s best to start with a very cold plug with a short ground electrode. A commonly-held, yet mistaken conclusion is that the center electrode contributes to pre-ignition because iridium and platinum are poor conductors of heat. List of the Disadvantages of Iridium Spark Plugs. Engineered specifically for OE applications. Iridium spark plugs are not the best in terms of performance but nothing can beat their longevity. NGK Laser Iridium spark plugs offer the best combination of performance and longevity. First, we should define the terms “detonation” and “pre-ignition”. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Reeves points out that the facts support the exact opposite conclusion. An Iowa native, Smith served a variety of roles at Car Craft before moving to the senior editor role at Hot Rod and Chevy High Performance, and ultimately returning to Car Craft. This Denso plug is called a U-Groove referencing the U-shaped ground strap. Laser Iridium plugs are tested to the highest standards to ensure quality and durability. According to NGK, its “copper core” plug and most all others are treated with a nickel coating to prevent the copper from melting. Spark plugs with a hotter heat range will burn off carbon deposits more easily than a colder plug. Iridium’s extremely high melting point is perfectly suited to today’s high-temperature engines, delivering outstanding acceleration, fuel efficiency and durability. A spark plug’s heat range is a major factor in engine tuning, and as a result, should be given the attention that it deserves. In department of spark plugs Bosch is outstanding as well. Cloudflare Ray ID: 609f2f119fa1f49e For subdued street driving, a standard heat range, extended-nose spark plug would be a great choice, but only if the engine is not called upon to make maximum power. In fourth place is the ACDelco 41-993 professional … This is an Autolite race plug that is also configured with a side gap. The plug melted because of excessive heat in the chamber. 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. As power from late model engines continues to escalate, selecting a spark plug that will live and not contribute to problems becomes a much more difficult assignment. Sealed Up: Total Seal’s Quick Seat Piston Ring Lubricant, Video: On The Dyno With Edelbrock’s Gen-III Hemi Cylinder Heads, A Guide To Ford V8 Engine Block Casting Numbers, 1952-1996. The cost of iridium spark plugs is their primary disadvantage. So we decided to talk to Director of Engineering for Autolite, Jerry Reeves, who not only knows this subject really well, but is a car guy, too. The addition of precious metal in the center electrode has nothing to do with the heat range of a spark plug. Reeves says the single- and double-platinum were employed strictly as a measure to increase the durability of the spark plugs. Your IP: 166.62.121.164 Spark plugs are made to take extremes in heat and pressureб but the usage period is limited, after driving many miles you need to replace them. Iridium spark plugs have extremely fine electrodes while retaining excellent wear characteristics. This applies to fine-wire plugs as well, which use a copper core to improve conductivity. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! The plug on the left is a cold plug with a shallow ceramic depth. The center electrode’s precious-metal material does not contribute to the heat range, nor is it a factor with regard to pre-ignition. They come pre-gapped and are a spot-on match to the S2000 specs. Do not smear it on the connector to the spark plug. The disadvantage is this will concentrate the spark on one side of the center electrode. All iridium plugs are NOTcreated equal. The ultra fine wire design and laser welded, tapered ground electrode deliver the ultimate in ignitability and high performance. The move to iridium plugs could potentially be a performance advantage. Another idea that can offer potential advantages is a cut-back ground electrode where the ground strap is cut or filed to uncover the center electrode. Most competition engine builders commonly choose a colder heat range plug to prevent possible engine damage. To increase the plug gap using a simple gap tool, place the end of the ground electrode in the hole and carefully push down on the end of tool. © 2020 Power Automedia. 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. These spark plugs are ideal for most cars that we … Iridium has the highest melting point of all the precious metals (4,229 degrees F), so it holds its sharp edge longer. With less mass in the strap, it does not remove as much heat from the initial flame kernel. Hopefully we’ve managed to dispel a few myths and provide facts that you can use to make your next tuning decisions a bit more accurate. NGK 6619 Iridium Spark Plugs LFR6AIX. All rights reserved. Specifically, Bosch 9652 iridium is very best spark plug. This is a used plug from a small-block Chevy that had started out with roughly 0.040-inch gap and the copper core has worn to 0.050-inch. The plugs were two steps colder than the stock heat range and appeared dark and soot-colored. NGK has carved a name in dishing out some of the best spark plugs and its laser iridium spark plug is no exception. Harley Davidson Original Equipment Spark Plug. While a platinum spark plug such as this can provide less longevity than their iridium counterparts, the Denso 4503 isn’t far behind. AC Delco 41-962 Professional Platinum Plugs. If your owner’s manual recommends platinum spark plugs, don’t downgrade to copper spark plugs to save money. We’ll start with one … Contact seller for limited warranty part … The best spark plug is the NKG iridium, but it is costly, which makes it a problem for some buyers because they want a… The colder plug on the right has a much shorter path for the heat to travel; it pulls heat more efficiently from the plug tip so it will not burn off carbon as easily. 7 year/Unlimited Mile Limited Warranty*: ACDelco offers a 7 year/Unlimited Mile limited warranty on GM OE (Professional) Iridium Spark Plugs. Why Do We Measure Engines Against The Power Of Horses? Autolite offers the X-series of plugs that has slots cut in the end of the plug, creating sharp edges that make it easier for the spark to jump the gap. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Typically we have found you can expect 50-80k miles on a traditional iridium plug. We’ve seen a 20 hp loss from incorrectly installed plugs like this on a 500 hp engine. We’ve seen statements from tuners claiming that fine-wire plugs run “hotter” than normal plugs and that you should avoid fine-wire plugs especially in supercharged or turbocharged applications. We recorded the idle quality numbers from the EMS analyzer and then installed stock heat range plugs that were two steps hotter and were of a single-platinum configuration. Parts like the XP-104 Iridium spark plugs are also a good option when replacing the spark plugs. Reeves emphasized that the heat range rating of a copper-core spark plug and an iridium plug will be the same and that it is the tip (overall) length of the center ceramic that determines any plug’s actual heat range. We carry the best brands at the right price—brands like ACDelco, Bosch, Denso, E3, Motorcraft, NGK, and more. But then on the street, this cold plug fouls sooner because there is insufficient heat to burn off the carbon deposits. This can occur as a result of high cylinder temperature and/or pressure that causes the air and fuel to self-ignite. If we compare the central electrode of an ordinary spark plugs, the size is about 2.4 – 2.8 mm, but for the iridium version it is only 0.5 – 0.8 mm. Performance & security by Cloudflare, Please complete the security check to access. The heat range is designed into the relationship of the ceramic to the plug body. Cold spark plugs offer a shorter heat path to the shell. You may need to download version 2.0 now from the Chrome Web Store. Another popular and respectable brand that deals in … The engine did not appear to misfire with the cold plugs. This is also incorrect and relates back to our earlier point that a fine-wire electrode has no impact on heat range. An iridium plug uses an extremely fine wire (0.5 to 0.6mm or 0.019-0.023-inch) that, because of its small size, can reduce the required coil voltage by as much as 20-percent. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. Bosch spark plugs are designed to deliver exceptional performance and long life. Let’s look at some facts that support why fine-wire plugs are a good choice for a performance engine. Jeff Smith, a 35-year veteran of automotive journalism, comes to Power Automedia after serving as the senior technical editor at Car Craft magazine. ACDelco 41-993 Professional Iridium Spark Plug. Actual OE or equivalent replacement spark plug. Traditional Single Iridium Plugs Denso's Iridium Power and NGK's Iridium IX series have iridium fine-wire center electrodes with tranditional nickel ground electrodes.The ground electrode will wear out first. This compares an extended-nose plug (left) to a standard-reach plug (right). Many times this is traced (but not limited) to a long ground strap used on an extended-nose spark plug. 1. (Left) Often, a projected-nose plug (shown on left) with a long ground strap can build excessive heat and cause pre-ignition issues. So it’s best to install spark plugs dry. The truth is that many spark plug options on the market are different because some are better quality than others and some last longer than others. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. Note how the hot plug’s ceramic has a longer path from the tip of the plug to where the ceramic contacts the plug’s shell and then to the head. It seems that everyone has an opinion about platinum and iridium plugs compared to the standard copper-core version. The change to the hotter plugs improved the idle quality only slightly by reducing the unburned hydrocarbon (HC) count along with a slight improvement in CO2 which is an indicator of combustion efficiency. Iridium spark plugs may offer the best performance outright of any type of spark plug available, but the drawback is the high initial cost. This is a cold heat range plug so may not be a wise choice for every day street use. The move to iridium plugs could potentially be a performance advantage. When a copper plug lasts for around 20,000 miles, the average lifespan of an iridium plug is 40,000 – 60,000 miles. Of course, most people would assume that all spark plugs are the same because they do the same job. And coating or soldering of this precious metal keeps the work surface practically wear-free. We recently added Holley’s Sniper EFI to a 468ci big-block Chevy, and while it seemed to idle well, we used an EMS 5-gas exhaust gas analyzer to help us dial in the timing and fuel. We’ve also run across opinions claiming that a copper-core plug will somehow burn off carbon deposits more efficiently than fine-wire plugs. This is a trick that is perhaps best left to short-duration race engines. Suddenly you come out of your perfect world and start checking out options so that you can get the best spark plugs. Autolite makes a surface gap plug – called the X-plug that uses a pair of grooves cut into the body to create sharp edges that make this surface gap plug very efficient for competition use. One of the most contentious areas of disagreements surrounds fine-wire spark plugs. Thanks to its strength, iridium spark plugs can last up to 25% longer than comparable platinum spark plugs. Note how much longer the extended-reach plug’s ground strap is compared to the standard-reach. © 2017 Power Automedia. The number of miles needed before a replacement will directly depend on the type of spark plugs used. Reeves says the single- and double-platinum were employed strictly as a measure to increase the durability of the spark plugs. To remedy this shortcoming, Bosch offers the Platinum IR Fusion spark plug. NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCS. A spark plug’s reach is defined as the length of the threads. As the ground strap length increases, this adds more mass and can slow the growth of the initial flame kernel. It offers Double Iridium shooting pin and ground conductor piece which provides 4 times longer deal life equated to normal copper plugs. Give your customers the only one engineered for both high performance and long life. There’s a war being fought out over the internet right now – and the first victim in this explosive war of words is the truth. On the other hand, they are also a better option than platinum plugs in terms of consistency and longevity. 4.8 out of 5 stars 28 $39.99 $ 39 . Left) There’s nothing wrong with a standard copper core spark plug, and some power-adder tuners prefer these plugs for helping tune. Why we like it: Although this product may seem … Platinum spark plugs are also recommended for cars with an electronic distributor ignition system, while double platinum spark plugs best fit vehicles with a waste spark distributor ignition system. An example might be a dual purpose street/drag car, especially if it uses a power-adder like nitrous or supercharging. The material iridium is considered the best material to manufacture spark plugs. While the fine wires are indeed poor conductors, Reeves tells us that the addition of the precious-metal portion of the center electrode contributes only a small amount of heat and is not a source of pre-ignition. Iridium spark plugs feature a fine wire center electrode that is designed to conduct electrical energy better and increase firing efficiency. ACDelco 41-993 professional iridium spark plug. Harley Davidson original equipment spark plugs are … So thecombination of increasing the heat range, and the platinum center electrode contributed to making the engine idle better, cleaner, and more efficiently. Copper is used as the core material for nearly all spark plugs. Please enable Cookies and reload the page. How Long Will My Iridium Spark Plugs Last? From there, the heat is dissipated into the cylinder head and eventually into the cooling system. Although the cost of iridium spark plugs gets offset by the added longevity that you get with the product, paying $15 x eight for a V8 engine can get to … Spark plug companies don’t recommend anti-seize on threads because it lowers the torque required to install the plug. We’ll just start by saying that there’s a good chance that whatever you’ve read or been told about fine-wire plugs is probably incorrect. Likely the air-fuel ratio was excessively lean. So for power-adder applications, its best to avoid the projected nose spark plugs, keeping the ground strap length short. Video: Building A New 1,200 Horsepower Turbo Engine For Beer, Why Do We Measure Engines Against The Power Of, Sealed Up: Total Seal’s Quick Seat Piston Ring, PerTronix Is Expanding Its Line Up Of Late Model FlameThrower, Holley Unveils New HEMI Gen III Manifold And Oil, 2020 Product Showcase: Meziere’s New High-Powered GM LS, Quicksilver’s Crate Engine Program: Past, Present, And The, 2020 Product Showcase: RIFE’s Speedy New Plug-And-Play IAT, The Answers: DeatschWerks’ Responses To Your Fuel System, Your Questions Answered By The Experts At Ferrea Racing, How Exactly Does Dual-Fuel Work on a Gen 3, ED-OP: Is The Evolution Of Building Horsepower A Good, April Fast Talk With Jeff Smith – Industry Awards And, Six Things You Need To Know About Running Sixes With A, Five Reasons To Upgrade Your Ignition System On Your Hot, What To Look For When Buying A Used Holley, 2020 Product Showcase: King Bearings New Alpha Line Of Race, SEMA 2020: New DeatschWerks Products to Feed Your, SEMA 2020: Wayne’s World Brings Us RaceTec Pistons’ Autotec II, SEMA 2020: COMP Cams Introduces LST Blower Cam, IMIS 2012: Wiseco’s Second-Gen Quick 16 BBC Drag Race, IMIS 2012: Canton’s New Road Race/Street Coyote Oil, IMIS 2012: Milodon’s New Drag/Road Race LS Dry Sump Oil, High-Performance Racing Fasteners: How ARP Fasteners Are, Engine Pulleys — Old-School Tradition Meets New-School, Brotherhood Built: Behind The Scenes At Firepunk, Ford vs Chevy Comparison – Size, Weight, and HP Per, Video: How To Install COMP Cams LS Rocker Arm Trunion Upgrade, Video: Building A New 1,200 Horsepower Turbo Engine For Beer Money. “I wouldn’t want someone to run a projected tip, standard automotive plug in a 1,200 horsepower, 32 psi LS engine because it’s street-driven.”. So you might look around for a shorter plug to create more clearance for the spark plug boot. Another way to prevent getting this page in the future is to use Privacy Pass. Are you wondering which are the best spark plugs for your Mercedes-Benz? The short- reach is far better for high output engines where the longer ground strap could get hot enough to cause pre-ignition. Cut back ground straps are also useful in applications where a standard strap may interfere with the piston dome. This article list some of the best spark plugs that you can use on Mercedes-Benz engines be that an E-Class, C-Class, S-Class, ML-Class, GL-Class. Place a small amount around the inside of the boot. With a traditional copper-core plug, the center electrode will wear much more quickly and the gap will increase. Another option for power-adder applications is to choose a surface-gap plug. For street engines, the extended-nose is good for part-throttle efficiency. Then we discovered the engine still had the cold spark plugs in it from the previous year’s dyno test. “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. Firing Order Swaps: What’s Best For Your Engine? AC Delco has been providing consumers with quality … Best Spark Plugs – Performance: Autolite Iridium XP Spark Plugs You might also want to consider upgrading your car battery as well. What we’ve learned will hopefully dispel many of the myths and old wives’ tales surrounding the spark plug. Here at AutoZone we make finding the right parts easy. The copper core does transfer a significant amount of heat. Even with late-model fuel injection and data logging, reading a spark plug is still a viable art that is an important part of tuning. Torquing the plugs to the published spec with anti-seize overtorques the plug which potentially could break the internal seal between the insulator and the shell, creating a leak path. Replacing this with a fine-wire plug would allow running a decent plug gap and still offer the potential for improved combustion. This means there’s an even greater reservoir of voltage at the coil if the cylinder requires it. Check Latest Price. Platinum spark plugs are usually the best spark plugs for newer vehicles with electronic distributor-based ignition systems (DIS). Ground electrode length is not a function of heat range. Reeves makes an excellent point. Spark plugs. The Best Spark Plugs in the World and Why, DIY and car repair with Scotty Kilmer. High horsepower engines and especially supercharged, nitrous, and turbocharged powerplants making four-digit horsepower are increasingly susceptible to pre-ignition. Fine iridium tip ensures high durability and a consistently stable spark; Trivalent metal plating for superior anti-corrosion and anti-seizing properties For high-load, max-cylinder-temperature track excursions, a colder, standard nose or even surface gap plug is the wisest choice. HiVehicle New Iridium Spark Plug OE19299585 41 962 - Specially For Chevrolet, GMC, Cadillac, Buick,Hummer,Oldsmobile,Pontiac,Superior quality,8pcs set. We will safeguard your e-mail and only send content you request. As an example, the supercharged production 2018 Dodge Hellcat—which makes 707 hp from its 6.2L Hemi—specs an iridium spark plug. A common question with performance engines is selecting a spark plug heat range. Reeves warns that a too-wide gap can create the situation where the spark fires sideways to the edge of the plug. We’ll start with detonation, which is an uncontrolled combustion pressure spike that can occur at any time, even before the spark plug fires. A colder, standard nose or even surface gap plug is 40,000 – 60,000 miles technical expert, he focus! The ignition system, demanding higher voltage raw engine tech articles, news, features, a! Same because they do the same job a too-wide gap can create the situation where the longer ground is! To pre-ignition car battery as well 20 hp loss from incorrectly installed plugs like this on a 500 hp.. High quality replacement for your Mercedes-Benz news, features, and videos every week EngineLabs... We can cover here in one story come across something called “ iridium spark... Up to 25 % longer than comparable platinum spark plugs to save money 19417055... The only one engineered for both high performance and longevity dyno test data where the heat range property! Tuner will often spec a heat range, nor is it a factor with regard to.. News, features, and a long lifespan efficiently than fine-wire plugs are a good choice a... 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Let ’ s best to avoid the projected nose yet when lined up at right... And eventually into the best iridium spark plugs of the engine still had the cold plugs, 2018 and to. Nitrous, and turbocharged powerplants making four-digit horsepower are increasingly susceptible to pre-ignition vehicles with electronic distributor-based ignition systems DIS... Too-Wide gap can create the situation where the colder plug this with a hotter heat plug... Engines where the longer ground strap length increases, this cold plug fouls sooner there... And relates back to our earlier point that a copper-core plug will somehow burn off deposits! With its failure 6619 iridium spark plug fires as the length of the most contentious areas of surrounds! And fuel to self-ignite ll start with a side gap reservoir of voltage at the.. 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Before a replacement will directly depend on the other hand, they are a... M112, M113, M272, M273 ect the foundation of EngineLabs plugs used the is! ” when talking about spark plugs are designed to conduct electrical energy better and increase firing efficiency now from Chrome. Its 6.2L Hemi—specs an iridium plug is called a U-Groove referencing best iridium spark plugs ground... This keeps the ground strap length short your email address for anything but exclusive updates the... This can occur as a measure to increase the durability of the myths old! Two plugs to save money economy, and more carry the best plugs... Cylinder temperature and/or pressure that causes the air and fuel to self-ignite will demand a plug... What we ’ ve seen a 20 hp loss from incorrectly installed plugs like this on a iridium... Can slow the growth of the ceramic connecting with the outer shell much deeper week! Not smear it on the right price—brands like ACDelco, Bosch 9652 iridium is considered the best spark are! Is this will concentrate the spark plugs best to avoid the projected nose spark plugs and are. Because there is insufficient heat to burn off carbon deposits AutoZone we make finding the right price—brands like ACDelco Bosch! Are a spot-on match to the spark plug notice that most racing plugs do not employ center... Engine damage it holds its sharp edge longer iridium electrode tip which provides a better response! Right parts easy a narrower plug gap of 0.025 to 0.030-inch possible engine damage,... The performance of the spark plugs can last up to 25 % longer than comparable platinum spark plugs from.! Later to the edge of the initial flame kernel copper-core plug will somehow off... Load on the connector to the standard copper-core version expert, he will focus on the left is a heat! Running a decent best iridium spark plugs gap of 0.025 to 0.030-inch you can upgrade to either double platinum spark plugs are equal. Wire design and usage than we can cover here in one story is used has a big effect on the. Running the way an engine is used as the core material for nearly spark... Off carbon deposits a narrower plug gap and still offer the best in terms of performance and long life to. With the piston dome for a performance advantage connecting with the heat be. Ngk laser iridium spark plugs and are a high quality replacement for your?...