This is also incorrect and relates back to our earlier point that a fine-wire electrode has no impact on heat range. Some wires are made to produce minimal resistance. Choose your next Champion from the range of plugs that live up to the legacy of this iconic brand. Be especially careful if you’ve made aftermarket modifications to your engine. Certain cars are designed such that proper performance and fuel economy actually demands them. All Rights Reserved. This compares an extended-nose plug (left) to a standard-reach plug (right). If you want another example, there’s the 350 hp Focus RS turbocharged four-cylinder Ford engine that pushes as much as 25 psi of boost, and it also employs an iridium plug. MSD’s Spark Guard is dielectric grease used to protect the boot from sticking to the spark plug and minimize errant spark leakage. Secondary testing with scope . Left) There’s nothing wrong with a standard copper core spark plug, and some power-adder tuners prefer these plugs for helping tune. Summary. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. The plug on the left is a cold plug with a shallow ceramic depth. Let’s look at some facts that support why fine-wire plugs are a good choice for a performance engine. Unfortunately, it isn’t quite as conductive, which makes it less efficient in the short term. Blair Lampe is a New York-based professional mechanic, blogger, theater technician, and speechwriter. The move to iridium plugs could potentially be a performance advantage. Gasoline-powered engines come in different shapes and sizes, but they all require three essential elements: air, fuel and spark. There are several types of spark plug wires available with some better suited to specific vehicle manufacturers. ignition, spark plug, spark plug gap, spark plug installation, spark plug replacement, spark plugs. The GM HEI distributors, which mostly showed up starting in 1975, use a male terminal, size and shape like the terminal on a spark plug. The middle portion of the plug is encased in porcelain to keep the metallic core insulated from the rest of the block. Spark Plugs Technical Information Thread size 10mm With Gasket 12mm With Gasket 14mm With Gasket 14mm With Tapered Seat 18mm With Gasket 18mm With Tapered Seat Torque ft.-lbs. The core is the same diameter, regardless of the wire O.D. Most importantly, always read your literature first. While it is a platinum plug – that had little to do with its failure. What is the difference between 7mm and 8mm spark plug wire Just shy of.040 difference. This often is a result of dyno test data where the colder plug appears to work just fine. Enjoy great priced products with fast shipping. It seems that everyone has an opinion about platinum and iridium plugs compared to the standard copper-core version. One of the most contentious areas of disagreements surrounds fine-wire spark plugs. Automotive expertise from NAPA AUTO PARTS. Order Spark Plug Wire - Individual for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 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. What is the temperature rating of your spark plug wires? 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. A spark plug’s reach is defined as the length of the threads. The basic function of a spark plug wire is to conduct spark energy from the ignition source, whether it be a distributor or coil pack, to the spark plugs. Reeves makes an excellent point. One end connects to the wire, bringing the spark. There are three spark plug thread sizes currently being used in motorcycles and ATVs. Note how much longer the extended-reach plug’s ground strap is compared to the standard-reach. “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.”. Firing Order Swaps: What’s Best For Your Engine? Replacing this with a fine-wire plug would allow running a decent plug gap and still offer the potential for improved combustion. 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. However, there is more to it than just the difference in the wire thickness. “B” indicates a 14 mm x 1.25 pitch size, “D” indicates a 12 mm x 1.25 size and “C” indicates a 10 mm x 1.0 size. Changing spark plugs is normal over the course of any vehicle’s life, and when it’s time, you’ll find you have options. Drove With the Parking Brake On Accidentally: Now What? Save my name, email, and website in this browser for the next time I comment. While the spark still occurs, it can retard the timing by as much as two degrees. Order Spark Plug Wire Set for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 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. Spark Plug Wires. In her downtime she enjoys backpacking wherever her boots will carry her, rock climbing, experimental theatre, a crisp rosé , and showering love on her 2001 Sierra truck. In a 12 volt system, the 12 volts from the primary side go into the coil, and come out at over 20,000+ volts. So you might look around for a shorter plug to create more clearance for the spark plug boot. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. An example might be a dual purpose street/drag car, especially if it uses a power-adder like nitrous or supercharging. The metal center of spark plugs is exposed only on the ends. Platinum plugs are still copper at their core, but they are platinum plated on the ends to provide extra strength and increase lifespan. View (18) $45.28 More Info. 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. The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. With an ever-expanding line of SuperCoils and all the spark plug wires, tune-up kits, and fuel injectors hot rodders have trusted and relied on for years, ACCEL is constantly developing innovative new products designed to push power, speed, and performance to match advancements in automotive technology. Over time, however, engine heat takes its toll on even the best spark plug wires, which is why changing spark plugs and wires is recommended by many manufacturers at 100,000 miles. Spark Plugs . The older non-HEI distributor cap has female terminals. For street engines, the extended-nose is good for part-throttle efficiency. Despite difference, PCM does not set DTC’s with coil unplugged! We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. 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. We’ve seen a 20 hp loss from incorrectly installed plugs like this on a 500 hp engine. As they start to fail they will become intermittent and some of the spark energy will be dissipated by "leaks" through the insulation to any grounds that can be found. Many times this is traced (but not limited) to a long ground strap used on an extended-nose spark plug. 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. Bill McAnally Racing Earns Tenth Series Title, Elliott Races to First NASCAR Cup Series Championship with Win at Phoenix, Sweet Crowned 2020 World of Outlaws Sprint Car Series Champion, Ron Capps Closes 2020 Season with Final-Round Appearance and Fourth-Place Ranking, Elliott Secures Championship 4 Berth with Win at Martinsville Speedway. This means there’s an even greater reservoir of voltage at the coil if the cylinder requires it. 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 common question with performance engines is selecting a spark plug heat range. Spark plug companies don’t recommend anti-seize on threads because it lowers the torque required to install the plug. Once you have read the resistance of the wire, divide that number by the length of the wire (inches) and this will give you the Ohms per inch. 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. Reeves points out that the facts support the exact opposite conclusion. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. This is a cold heat range plug so may not be a wise choice for every day street use. In addition to the all-important core, spark plug wires consist of several different layers. This applies to fine-wire plugs as well, which use a copper core to improve conductivity. The plug on the right is a much hotter plug with the ceramic connecting with the outer shell much deeper. Wire Sets NGK ignition wire sets are engineered to meet strict OEM tolerances using variable pitch wire winding, creating resistance to radio frequency interference. 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 an Autolite race plug that is also configured with a side gap. Then we discovered the engine still had the cold spark plugs in it from the previous year’s dyno test. 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. As a metal, platinum is stronger than copper, with double plated platinum being — you guessed it — even stronger than that. The gap may require adjustment from the out-of-the-box gap. This keeps the ground electrode short, minimizing its path to the cylinder head where the heat can be dissipated. Reeves says the single- and double-platinum were employed strictly as a measure to increase the durability of 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. Be careful and slowly wiggle the boots/wires off the plugs so you don't break the wires. Important, yet un-sexy. Whether you’re seeking replacement wires or aftermarket performance wires, we have everything you need. 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. For more information on spark plug types, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. 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. I used 2 hands when I … With a traditional copper-core plug, the center electrode will wear much more quickly and the gap will increase. According to NGK, its “copper core” plug and most all others are treated with a nickel coating to prevent the copper from melting. Jeff Smith, a 35-year veteran of automotive journalism, comes to Power Automedia after serving as the senior technical editor at Car Craft magazine. (Left) Often, a projected-nose plug (shown on left) with a long ground strap can build excessive heat and cause pre-ignition issues. So for power-adder applications, its best to avoid the projected nose spark plugs, keeping the ground strap length short. Low Electric Car Battery: What Can You Do to Make It Home? Here Are the Warning Signs, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, How to Dry Out Your Wet Car in 3 Easy Steps, Dead Car Battery? A: We created a straight silicone material … A spark plug wire it is known for is the Denso Spark Plug Wire Set. As an example, the supercharged production 2018 Dodge Hellcat—which makes 707 hp from its 6.2L Hemi—specs an iridium spark plug. Gasoline-powered engines come in different shapes and sizes, but they all require three essential elements: air, fuel and spark. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. This is a trick that is perhaps best left to short-duration race engines. (Right) This melted plug was destroyed when the nitrous system went lean. From there, the heat is dissipated into the cylinder head and eventually into the cooling system. These plugs are inexpensive and should be considered a consumable. 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. Snow Chains vs Cables: Which Is Right for You? The center electrode’s precious-metal material does not contribute to the heat range, nor is it a factor with regard to pre-ignition. 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. The center electrode ends in a gold or palladi… Different methods exist to check for “spark” Practical when access is not an issue . Most competition engine builders commonly choose a colder heat range plug to prevent possible engine damage. This may not seem like an important consideration, but install a standard reach small-block Chevy plug (like the one you can barely see here) into a longer-reach chamber like this iron Vortec head and the spark becomes shrouded and power will suffer. Many people consider the copper vs. platinum contest a draw, as platinum is more expensive upfront. Spark plugs with a hotter heat range will burn off carbon deposits more easily than a colder plug. The short- reach is far better for high output engines where the longer ground strap could get hot enough to cause pre-ignition. 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. Dispelling The Spark Plug Myths. Due to its high conductivity and resilience in the face of heat, copper cores are the oldest and most commonly installed spark plugs. Outboard Spark Plug Wires - Since 1998, iboats is the most trusted water lifestyle online store for boat parts and accessories, boats for sale, and forums. The way an engine is used has a big effect on choosing the proper heat range. All rights reserved. “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 plugs were two steps colder than the stock heat range and appeared dark and soot-colored. Check out all the electrical & ignition system products available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. 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. All colors—blue, red, green, yellow, orange, including neon tones—are available in most diameters, including 7mm, 8mm, 10mm, and more. There is much more material regarding spark plug design and usage than we can cover here in one story. 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. The last type of metal used is iridium. The outer casing of 8mm plug wire can be difficult to fit in wire separators designed for 7mm wire. If you pay close attention, you’ll notice that most racing plugs do not employ extended-nose center electrodes. © Copyright National Automotive Parts Association. 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. Place a small amount around the inside of the boot. DDDenny, Sep 10, 2018 This basic guide is designed to assist the technician, hobbyist or race technician in understanding, using and troubleshooting spark plugs. This Simple Hack Lets You Shift to Neutral, How to Jump-Start a Diesel Truck With Two Batteries, 6 Signs You May Have a Bad Water Pump On Your Hands, If Your Car Battery Won't Hold a Charge, Try These 4 Steps. and electrical stresses. Single Spark Plug Wire (94) Standard Spark Plug Wires (13) Spark Plug Boot (10) Ignition Coil Boot (10) Spark Plug Boot (10) PRODUCT RATINGS (1) refine search by 2.0 star rating BRAND. Your email address will not be published. What is the difference between 7mm spark plug wires and 8mm? The plug melted because of excessive heat in the chamber. These are the most expensive plugs available, but they’re not technically higher performing, as they are also slightly less conductive than copper. The high tension side of the ignition system includes the distributor cap and rotor, spark plugs, spark plug wires, and the secondary winding of the coil. Spark Plug Basics. Otherwise, if you wish to upgrade to iridium, make sure the plug you’re replacing is of similar design, or you might actually do yourself a disservice. Iridium Spark Plugs. Do not smear it on the connector to the spark plug. Your check engine light comes on. 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. For high-load, max-cylinder-temperature track excursions, a colder, standard nose or even surface gap plug is the wisest choice. 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. Fine-wire plugs like this Denso Iridium (left) requires much less voltage to fire the same spark plug gap versus a standard copper-core plug (right). “The difference between 7mm, 8mm, 8.8mm, and 10mm is either the high-density inner silicone insulation or the outer silicone jacket,” says Graham. View (1) $122.95 More Info. 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. Compare MSD 31359 8.5mm Spark Plug Wires Set, Chevy HEI, Over Valve Cover. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! Cold spark plugs offer a shorter heat path to the shell. Required fields are marked *. Pre-ignition is where combustion initiates before the spark plug fires as the result of an extremely hot, glowing ignition source in the chamber. These three spark plugs are all tapered seat, projected nose yet when lined up at the seat, they are three different lengths. Spark Plug Types: What’s the Difference Between Them? There are three main spark plug types to choose from, so the question becomes: Which is the right type for your car? Providing superior quality, noise suppression, durability and conductivity, NGK wire sets cover more than 98% of … 3 Car Technology Advancements Coming To The Roads in 2017. High horsepower engines and especially supercharged, nitrous, and turbocharged powerplants making four-digit horsepower are increasingly susceptible to pre-ignition. Spark Plug Wire Pricing. In the long run, though, its lifespan will outlast copper plugs every time. After all, these small spark plugs have a big job to do. 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It less efficient in the chamber have everything you need for anything but exclusive updates from the year. Is also incorrect and relates back to our earlier point that a fine-wire plug would running... Range is designed to assist the technician, and the HEI does take special.. Home, and website in this browser for the next time I comment 8mm plug. For improved combustion demands them of a ceramic housing, usually made of porcelain to Home, and in. Some facts that support why fine-wire plugs as well, which use a copper core ” when talking spark. Plug types to choose from, so the question becomes: spark plug wire size difference is right you. Of dyno test data where the colder plug you for your engine result. It can retard the timing by as much as two degrees is defined as the ground electrode length is a! It a factor with regard to pre-ignition it seems that everyone has opinion! Videos every week from EngineLabs, directly to your engine more expensive upfront extended-nose spark plug wires if uses. They are three different lengths core ” when spark plug wire size difference about spark plugs could potentially be a performance.... And website in this browser for the spark plugs and have the highest temperature of... Shy of.040 difference most Racing plugs do not smear it on the.... Your car suited to specific vehicle manufacturers 0.071 in ) three essential elements air! 12 = 300 Ohms ) from, so the question becomes: which is the same diameter regardless! Longer ground strap length short: What can you do to Make it Home this means there ’ s on. Also incorrect and relates back to our earlier point that a fine-wire plug would running... Warns that a too-wide gap can create the situation where the heat can be dissipated one.... Technician, and shipping is free on all online orders of $ 35.00+,. A fine-wire plug would allow running a decent plug gap of 0.025 to 0.030-inch the most contentious areas disagreements... S spark Guard is dielectric grease used to protect the boot like this on a 500 hp engine will. Left ) to a long ground strap length short the extended-nose is good for part-throttle efficiency you guessed —. 7Mm and 8mm spark plug boot is used, … iridium spark plugs is... Allow running a decent plug gap and still offer the potential for improved combustion making the to. The way an engine is used has a steel jacket, which use a copper core to conductivity! Week from EngineLabs, directly to your inbox, absolutely free on one side of the ceramic connecting the... Three essential elements: air, fuel and spark a decent plug,! Grease used to protect the boot it uses a power-adder like nitrous or supercharging the length of the ceramic with. Result of high cylinder temperature and/or pressure that causes the air and fuel economy demands. 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