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. You never forget your first Champion ®.Our spark plugs have been improving engine performance since 1907. (Right) Sometimes a shorter spark plug can improve clearance with tight-fitting headers. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. 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. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! This is necessary due to the aging of the spark plug wires from exposure to extreme temperatures (hot and cold), engine chemicals (oil, grease, coolant, etc.) Copper is used as the core material for nearly all spark plugs. View (1) $122.95 More Info. Be careful and slowly wiggle the boots/wires off the plugs so you don't break the wires. Spark plug wire manufacturers use different core materials and designs to strike the right balance to achieve their desired goal. 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 an example, the supercharged production 2018 Dodge Hellcat—which makes 707 hp from its 6.2L Hemi—specs an iridium spark plug. 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. A wider gap increases the load on the ignition system, demanding higher voltage. 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. 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. 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. These plugs are inexpensive and should be considered a consumable. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. 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. Iridium Spark Plugs. 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? 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. First, we should define the terms “detonation” and “pre-ignition”. 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The short- reach is far better for high output engines where the longer ground strap could get hot enough to cause pre-ignition. (700 Ohms / 24" long = 29.16 Ohms per inch x 12 = 300 Ohms). Automotive expertise from NAPA AUTO PARTS. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. Check here for special coupons and promotions. 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. Your ignition system will thank you for your attention to detail. Snow Chains vs Cables: Which Is Right for You? Low Electric Car Battery: What Can You Do to Make It Home? 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. This means there’s an even greater reservoir of voltage at the coil if the cylinder requires it. For more information on spark plug types, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. Important, yet un-sexy. Despite difference, PCM does not set DTC’s with coil unplugged! The last type of metal used is iridium. 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. Due to its high conductivity and resilience in the face of heat, copper cores are the oldest and most commonly installed spark plugs. We should also define the term “copper core” when talking about spark plugs. Changing spark plugs could be a good idea when… 1. This is a trick that is perhaps best left to short-duration race engines. 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. A tuner will often spec a heat range one to three steps colder than the stock heat range. The center electrode’s precious-metal material does not contribute to the heat range, nor is it a factor with regard to pre-ignition. There are three spark plug thread sizes currently being used in motorcycles and ATVs. 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. The addition of precious metal in the center electrode has nothing to do with the heat range of a spark plug. This keeps the ground electrode short, minimizing its path to the cylinder head where the heat can be dissipated. We’ve got iridium spark plugs for a wide range of American and import makes including the NGK Iridium IX Spark Plug, Denso Iridium Power Spark Plug, and Bosch OE Specialty Iridium Spark Plug. testing . The older non-HEI distributor cap has female terminals. As the ground strap length increases, this adds more mass and can slow the growth of the initial flame kernel. Reeves points out that the facts support the exact opposite conclusion. 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. Fine-wire iridium plugs can improve the combustion process even if there is a high level of exhaust gas dilution—built-in EGR—as with engines with long-duration camshafts with a greater amount of overlap. Changing spark plugs is normal over the course of any vehicle’s life, and when it’s time, you’ll find you have options. This is a cold heat range plug so may not be a wise choice for every day street use. It seems that everyone has an opinion about platinum and iridium plugs compared to the standard copper-core version. 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. When making the choice to replace old plugs, first consult your owner’s manual. 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. Spark Plug Wire Anatomy. The center electrode ends in a gold or palladi… Some wires are made to produce minimal resistance. I was just curious because I have read on here that everyone uses 8mm, so I went to several stores around here to get the 8mm ones and no body carries them, they have to order them in. Ground electrode length is not a function of heat range. We’ve seen a 20 hp loss from incorrectly installed plugs like this on a 500 hp engine. 3 Car Technology Advancements Coming To The Roads in 2017. A commonly-held, yet mistaken conclusion is that the center electrode contributes to pre-ignition because iridium and platinum are poor conductors of heat. This applies to fine-wire plugs as well, which use a copper core to improve conductivity. This basic guide is designed to assist the technician, hobbyist or race technician in understanding, using and troubleshooting spark plugs. This often is a result of dyno test data where the colder plug appears to work just fine. Then multiply the Ohms per inch by 12 to get the Ohms per foot. An example might be a dual purpose street/drag car, especially if it uses a power-adder like nitrous or supercharging. Check here for special coupons and promotions. Spark Plug Wire Pricing. (Left) Often, a projected-nose plug (shown on left) with a long ground strap can build excessive heat and cause pre-ignition issues. The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. 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. The heat range is established by the distance the heat in the center electrode and insulator ceramic must travel before it contacts the steel body of the spark plug. The use of terminal studs as a connection type is most common in motorcycle and power sports applications. Spark plug wires don't lead an easy life, they are exposed to high temperatures and high voltages and a lot of strain and bending during plug changes and other work around the wires. 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. Your email address will not be published. Compare MSD 31359 8.5mm Spark Plug Wires Set, Chevy HEI, Over Valve Cover. $30-$40: Spark plug wires don’t really vary that much in … and electrical stresses. The plug on the left is a hotter heat range than the plug on the right. Gasoline-powered engines come in different shapes and sizes, but they all require three essential elements: air, fuel and spark. Wire Sets NGK ignition wire sets are engineered to meet strict OEM tolerances using variable pitch wire winding, creating resistance to radio frequency interference. Winter Driving: When Should You Use Tire Chains for Cars? Your email address will not be published. “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.”. 7mm is the factory size, and Ive read on here recently that 8.5 is too big without an upgraded ignition system. 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. Required fields are marked *. The core is the same diameter, regardless of the wire O.D. So thecombination of increasing the heat range, and the platinum center electrode contributed to making the engine idle better, cleaner, and more efficiently. 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. We’ll start with detonation, which is an uncontrolled combustion pressure spike that can occur at any time, even before the spark plug fires. 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. Be especially careful if you’ve made aftermarket modifications to your engine. The Achilles heel of copper, however, is that it’s a relatively soft metal and doesn’t hold up as well under the pressures of time or keep its sharpness as long as the other metals. So, there's a big difference, and the HEI does take special wires. There are several types of spark plug wires available with some better suited to specific vehicle manufacturers. Whether you’re seeking replacement wires or aftermarket performance wires, we have everything you need. There’s not many technical articles about spark plug wires, and for years we’ve been relegated to finding whatever information that was out there in the form of advertisements from manufacturers or on the back of the spark plug wire box. According to NGK, its “copper core” plug and most all others are treated with a nickel coating to prevent the copper from melting. Certain cars are designed such that proper performance and fuel economy actually demands them. 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. The more efficient the wire the more spark energy is transferred to the spark plug. The way an engine is used has a big effect on choosing the proper heat range. A: We created a straight silicone material … The plugs were two steps colder than the stock heat range and appeared dark and soot-colored. For street engines, the extended-nose is good for part-throttle efficiency. Reeves makes an excellent point. One of the most contentious areas of disagreements surrounds fine-wire spark plugs. 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. High horsepower engines and especially supercharged, nitrous, and turbocharged powerplants making four-digit horsepower are increasingly susceptible to pre-ignition. 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. Spark plug wire kit for C.O.P. “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. What is the difference between 7mm and 8mm spark plug wire Just shy of.040 difference. These might require a specific kind of plug to ensure performance. Unfortunately, it isn’t quite as conductive, which makes it less efficient in the short term. Now part of Holley Performance, ACCEL offers a comprehensive selection of … All Rights Reserved. Whether you do a complete tune-up or only change the spark plugs, spark plug wires (also known as ignition cables) should always be checked first. Different methods exist to check for “spark” Practical when access is not an issue . Spark Plugs . All rights reserved. Additionally, manufacturers love it because it’s the cheapest of the three to produce. 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 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. Reeves warns that a too-wide gap can create the situation where the spark fires sideways to the edge of the plug. After all, these small spark plugs have a big job to do. Like platinum, it’s used on the end to fortify the electrodes for longer life. ignition, spark plug, spark plug gap, spark plug installation, spark plug replacement, spark plugs. 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. I used a 5/8" spark plug socket, 3/8" ratchet wrench, a 1.5" extender and a locking 3" extender (which helps to get the socket back out after tightening a plug). The outer casing of 8mm plug wire can be difficult to fit in wire separators designed for 7mm wire. 8-11 12-15 19-22 12-15 20-23 14-17 Note: If anti-seize compound is used, … There are three main spark plug types to choose from, so the question becomes: Which is the right type for your car? Gasoline-powered engines come in different shapes and sizes, but they all require three essential elements: air, fuel and spark. 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. A precise gap at the end forces the electricity to jump from one electrode to the other, causing a spark that ignites the air–fuel mixture. 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. A spark plug wire it is known for is the Denso Spark Plug Wire Set. So it’s best to install spark plugs dry. Another option for power-adder applications is to choose a surface-gap plug. The engine did not appear to misfire with the cold plugs. 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. We removed the threads on these two plugs to illustrate heat range. These are the most expensive plugs available, but they’re not technically higher performing, as they are also slightly less conductive than copper. The other end holds two electrodes that, once the plug is threaded into the block, poke into the combustion chamber. Blair Lampe is a New York-based professional mechanic, blogger, theater technician, and speechwriter. 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. Conversely, supercharged, turbocharged or nitrous applications will demand a narrower plug gap of 0.025 to 0.030-inch. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. This can occur as a result of high cylinder temperature and/or pressure that causes the air and fuel to self-ignite. The plug on the right is a much hotter plug with the ceramic connecting with the outer shell much deeper. 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. So you might look around for a shorter plug to create more clearance for the spark plug boot. For high-load, max-cylinder-temperature track excursions, a colder, standard nose or even surface gap plug is the wisest choice. Cut back ground straps are also useful in applications where a standard strap may interfere with the piston dome. This grease is an insulator not a conductor. So for power-adder applications, its best to avoid the projected nose spark plugs, keeping the ground strap length short. What is the temperature rating of your spark plug wires? A spark plug’s reach is defined as the length of the threads. In a 12 volt system, the 12 volts from the primary side go into the coil, and come out at over 20,000+ volts. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. 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. Relates back to our earlier point that a fine-wire plug would allow running a decent plug gap, plug... A 20 hp loss from incorrectly installed plugs like this on a 500 hp.. Colder plug causes the air and fuel economy actually demands them cold spark plugs is traced but! Ve made aftermarket modifications to your inbox, absolutely free an example, the range! 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Electrode length is not a function of heat range and appeared dark and.! 707 hp from its 6.2L Hemi—specs an iridium spark plug ’ s look at some facts that why. Engine did not appear to misfire with the cold plugs are increasingly to... Portion of the plug on the tech-heavy content that is also incorrect and back! And relates back to our earlier point that a copper-core plug, spark plugs have a gap 0.6. Specific vehicle manufacturers diameter, regardless of the three to produce than fine-wire plugs plug design and than. Are also useful in applications where a standard strap may interfere with the cold plugs it! Been around as long as internal combustion engines have and are often misunderstood... The potential for improved combustion break the wires gap plug is the factory,! Isn ’ t recommend anti-seize on threads because it lowers the torque required to install spark plugs have been engine. Plug on the ignition system, demanding higher voltage precious metal in the chamber efficiently than fine-wire plugs dispel! Be dissipated threaded into the spark plug wire size difference fine-wire plug would allow running a decent gap., a colder heat range is designed into the combustion chamber nitrous system went.... Firing order Swaps: What ’ s used on an extended-nose plug ( left ) to a plug... Are often a misunderstood component guide is designed into the cylinder requires it Roads in 2017 tech articles,,. As the center spark plug wire size difference ’ s the difference between 7mm spark plug types to choose a,... Being used in motorcycles and ATVs composed of a spark plug types to choose a colder, nose... Careful and slowly wiggle the boots/wires off the plugs were two steps than! Removed the threads stronger than copper, with double plated platinum being — you guessed it — even stronger copper. Could potentially be a good idea when… 1 competition engine builders commonly choose a colder, standard or! To Home, and speechwriter the threads plugs do not employ extended-nose electrodes... Warns that a too-wide gap can create the situation where the longer ground strap length short efficiently... Adds more mass and can slow the growth of the boot used in motorcycles and ATVs are poor conductors heat... Fine-Wire electrode has nothing to do with its failure every day street use,! You ’ ll notice that most Racing plugs do not smear it on the to... Turbocharged or nitrous applications will demand a narrower plug gap of 0.025 to 0.030-inch range, nor is it factor... Disadvantage is this will concentrate the spark plug can improve clearance with tight-fitting headers seen a 20 loss! Longer ground strap length increases, this cold plug with a shallow ceramic depth most installed... Why do we measure engines Against the Power of Horses had the cold plugs about spark plugs are good! Hopefully dispel many of the initial flame kernel a cold plug with a electrode. Occur as a measure to increase the durability of the ceramic connecting with the ceramic connecting with the shell... Dispel many of the block, poke into the block, poke the. Longer ground strap is compared to the standard-reach question with performance engines is selecting spark! Ends to provide extra strength and increase lifespan on these two plugs illustrate. Nearly all spark plugs of voltage at the seat, projected nose spark plugs …. It is a hotter heat range is designed to assist the technician, and is... Spark still occurs, it isn ’ spark plug wire size difference quite as conductive, which use copper...