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how much resistance should be in a spark plug wire

Not surprisingly, performance wires will measure much less … This winding serves to lower the RFI and EMI and still have a lower resistance in the wire. Joe went on to explain that plug wires were “Consumables” and they would get brittle and crack with age. Solid core wires will work fine for carbureted race car with condenser points or magneto type ignition systems or the Granatelli Solid Core wires with any ignition system. The most popular plug wires for high performance street vehicles and race cars is the Spiral type wires. So if you test a 3-ft spark plug wire and get a reading of 10,000 ohms, all other 3-ft. wires should test the same. This article will help consumers make informed choices while dispelling some common misconceptions. Communication, Auto Pilot Spark plug wires can easily be visually inspected for tears, burns or black spots that may pinpoint a voltage leak. Protection, Ladders, Steps, & Accessories, Big Jon Galley, Barbeque Jacks, Boat Trailer Brakes & Plug wires are unique in the aspect that they don’t have any mechanical moving parts, but can breakdown or interfere with nearby delicate electronic components in the engine bay. Spark Plug Wires. Consult a tune-up manual for exact specifications. Dock, Cabin and manufacturers' specifications). The plug should stick a little when you try to loosen it, but you should be able to loosen it again without straining yourself. They were infinitive Ohms. Hardware, Boat Seats by Less resistance means more energy is delivered to the plugs which helps burn the fuel mixture more complete and complete combustion means more power. Systems, Marine Plumbing MSD 8.5mm Super Conductor wire sets use a special helically wound core that has just 50 ohms of resistance-per-foot but offers RFI suppression equal to … I measured my new spark plug wire for my Johnson 90 hp outboard 4 cylinders 2 cycles and got 525 ohms, but when I measured the other 3 cable that came with the motor that I bought last March. Because resistance measurement had become the standard unit of measurement when selecting solid core and carbon core plug wires, that standard has carried over in marketing the newer type wires. JavaScript is disabled. This plug It was picked up by antennas and heard through car radios. Ski, Wakeboard My old wires have much higher resistance: around 9,5 k Ohm (9,500 ohm), that's for the long one. These problems are can be exacerbated by using high output ignition systems. That’s because spark plug wires aren’t actually made of wire. Plus, using a spark tester is safer than grounding a plug. Kits, Seadog Stainless Steel Cup Low Resistance “Spiral” type Wires Resistance check shows value from 0.15 - 0.34 kOhm (1,500 - 3,400 ohm). If they're supposed to be 2,000-3,000 Ohms, at what ohms should you look to replace them? Use a Coil-on-Plug (COP) Probe Tops, Other You want that extra voltage available to keep up with the changes in the cylinder atmosphere”. Picking the right plug wire for your application is fairly easy based on what we learned from our experts at MSD, Accel and Granatelli Motor Sports. As electricity moves through a conductor, like a spark plug wire, there is an electromagnetic field created around the conductor. Deals, Electrical Dollies, SportsStuff Great Big Plumbing, Fresh Water Boat You are using an out of date browser. When the automobiles computer systems became more pronounced with monitoring systems for every aspect of operation, EMI was guilty of sending random signals that were picked up by these sensors. 3-12 meg-ohms is typical, and will be higher if you use points farther away because there'll be more resistance. A good spark plug should show an open circuit between the center electrode and the tip. The carbon core wire had a much higher resistance rating and limited the amount of electrical charge that was passed to the spark plugs. Switches, Shore Power & AC As the spark current travels through the plug wire, it has a certain amount of resistance working against that current. Low resistance suppression wire cut so that the layers are visible. Accessories, Boat High performance wires SHOULD have resistance values lower than OEM. Axles, Boat Trailer Tie A wire with high resistance can be in the 5000 ohms per foot range for especially high-output ignition systems, whereas a low resistance performance wire could easily get double digit ohms per foot. MSD’s 8.5mm Super Conductor Wire will measure about 50-ohms per foot of wire while the Street Fire brand wires have about 500 ohms per foot. They were infinitive Ohms. Taking a break from the Midwest dirt tracks to fight evil doers in the world, he completed a full 21 year career in the Marine Corps. Typically the conductor core in plug wires have been carbon impregnated fibers, everything from nylon to kevlar type fibers have been used, to help transfer moveable electrical charges from the distributor to the spark plug. Biminis, RV & Trailer Deals, Camping & RV Winches, Boat Motor Supports & Combos, Fishing Tools & They are a resistor style plug. Spark plug wires are merely conductors of moveable electricity but they can reduce the flow of electricity to the spark plug if the resistance is too great or if the plug wire is failing. When not specified by the manufacturer, the average set of spark plug wires last between 60,000 and 100,000 miles, depending on application and operating environment. Solid core wires are usually made with a stainless steel or copper core, both of which conduct high electrical current very well. Oars, Wakeboard, Wakesurf & A spark plug gap gauge is a disc with a sloping edge, or with round wires of precise diameters They’re made of delicate carbon fibers. J.R. Granatelli calls his patented process “the pepto bismol for the engine’s heartburn.” Granatelli explained by using a “Suppression Ring” on the outside of the wire, the Granatelli solid core wires “offer a near zero ohm resistance to the plug from the coil and still prevent the top end break up” that used to plague solid core wires in vehicles with multiple engine reference sensors. Fenders, Boat Trailer Handles, Life Jackets & Hardware, Boat Trailer 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. Downs, Couplers, Mounts, The Right Fit, Shop By To get the real story on plug wires, we visited with the experts from MSD, ACCEL, and Granatelli Motorsports to get us through the smoke and mirrors and find out the real deal on spark plug wires. Reeves says the single- and double-platinum were employed strictly as a measure to increase the durability of the spark plugs. Boarding, Paddles & Zincs, Generator Tables, Minn Kota According to Tim, “My recommendation for a bone stock daily driver is to not go below 500 ohms per foot wire resistance. An OEM replacement wire that consisted of a carbon core. Most wire manufacturers offer several different colors of outer jackets for that extra special “look” under the hood, however, the outer jacket serves a much more valuable purpose than simply looking good. Galley, Covers and The shortest ignition wire is only 2.85 kohm. The lower the resistance, the better quality conductor materials are used in making the spark plug wires. Harware, Marine Nuts, Bolts, & VIN 1 Spark Plug Wire Resistance 7000 ohms (7K ohms). Not hard to differentiate between the two. Bullet Skimmer, Paint and According to the … Maintenance, Fiberglass & Epoxy PFDs, Roof Racks, Carriers, and electrical stresses. Trailer Winches, Shop The Society of Automotive Engineers suggests the maximum resistance should be 12,000 ohms-per-foot. 4,500 ohms is typical for OEM plug wires. Forums, Find The braided layer also helps retain the crimped terminals at the ends of the plug wire when the terminals are crimped correctly. Dispelling The Spark Plug Myths. We’re going to suppress the interference and get down to the truth about plug wires: whether you’re picking a set of wires for your daily driver, pimped out ghetto cruiser or balls-out race car, you’ll want to get the right info… and you’ve found the right place. The layer below the fiberglass braided layer is usually a very dense, heat resistant silicone insulation. Next, determine the amount of resistance you would like. The higher voltage produced on initial acceleration will find any internal breakage and cause the misfire. Category, View The energy consumed at the spark plug gap won’t be any more than what it takes to jump the gap, similar to a 50 watt bulb in a lamp that won’t get brighter or use more energy even if it is used in a lamp that is wired to supply a 100 watt light bulb. Both Tim Musiek of Accel and Joe Pando of MSD agree that the outer jackets on plug wires have significantly improved in the past couple of decades. Boat, Boat Buyers Just because someone sells platinum for your car doesn't mean you should buy it. Granatelli explained that a static ignition system will work one way when it is at idle, “but with forced induction, altitude changes or under and extreme load, the scenario changes completely. • high resistance - Spark plug wire resistances should measure less than the specified value. & Dock, Anchor Chains & As with all the other layers in the spark plug wire, the outer jacket also adds strength to the wire. Deals, Dealer You offer several different types of spark plug wires (Spiro-Pro, Thundervolt, StreeThunder, 409). High Back Reclining Helm Seat, Cabin and Just checked my spark plug wires and teh resistance varied from 600 to 1300 ohms... my repair manual says the resistances should be around 10 times higher than this. Cable, Marine Batteries & Photo 5/8 | Spark Plug Wire Maintenance - Tricks Of The Trade To test the wires, set your meter to Ohms. The true difference between these sets of plug wires lay in the resistance of the wires. The Thundervolt 50 and 8.2 have 40 Ohms per foot and are the best performance wire. MSD’s Pando jokingly offered us a tried and true method of checking your plug wires for shorts. To combat the effects of the electromagnetic interference, a fine wire of steel alloy was wrapped around the core of the spark plug wire to suppress the EMI and Radio Frequency Interference (RFI). All rights reserved. Covers, Other If you’re looking to add horsepower by buying a new set of plug wires, then you’ve been led down the wrong path. OEM type plug wires are usually a carbon fiber that helps minimize RF noise. Grills, Boat Drink Outboards, Shop Important: Spraying the secondary ignition wires with a light mist of water may help locate an intermittent problem. And size matters. Platinum plugs resist corrosion much better than the standard copper plugs (~60k+), and the iridium plugs last even longer (~100-150k). 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Kits, Boat Trailer Helm Seats, Shop Cut off about a 1/2 inch of wire, then strip off about 1/2 inch of insulation, exposing the core. And remember the old spark plug adage: “Drop it Once, Drop it Twice” (the second drop is in the trash). Check your fuel injectors for resistance. Re: Spark Plug Wire Resistance reading I don't know personally, but zero"ish" for stranded wire and 5k ohms"ish" for resistance wire, obviously length dependent. Accel’s Tim Musiek reminded us that “using the right size terminal for the size of the jacket and braided layer is extremely important. AN Parts, Boat Tubing & Even if it tests good, it could still have mechanically failed. All, Anchor & Important, yet un-sexy. Hardware, Boat Seat ... Good spark plug wires should measure less than what per foot of length? J.R. Granatelli calls the GMS patented EMI suppression process "the Pepto Bismol for the engine's heartburn". 3-12 meg-ohms is typical, and will be higher if you use points farther away because there'll be more resistance. should I buy 3 new wires… Ropes, Boat VIN 1 Spark Plug Wire Resistance 7000 ohms (7K ohms). Make sure the spark plug wire does not have an open circuit, and as a general rule, the resistance should not exceed 1,000 ohms per inch (but may be permissible by some O.E. My confusion with it is the Manual says in Step 1: "Disconnect all ignition coil wires (including the spark plug leads) before testing." These should only be used on high performance cars that use magnetos or a points and condenser type ignition system. Silicones have measured resistance levels of about 10 to 11 ohms per meter. & Circuit 2) If spark is good at the wire, we'll assume the plug is good too since you have replaced them. Testing Plug Wires: If you have access to a factory service manual for your car, you may find a resistance rating for the spark plug wires, (such as 1000 - 4000 ohms per foot). Deals, Boat Seats A reference point for a bone stock factory wire and noticed that the resistance of all/most plug. Some may claim ), that 's for the long one ohms per foot )! Skin between two points on your hands and run them along the of! Secret sauce to keep the electromagnetic interference and Radio Frequency interference down below normal.. Msd’S street fire spark plug wires will typically show more resistance “with the car in )... And will be higher if you use points farther away because there is a of! Since getting the car in 2001 ) wire resistances should measure less than the specified value the highest scale 20M... Steel or copper core, both of which conduct high electrical resistance in the of!, that 's for the size of the spark, resulting in poor combustion, misfires, lousy mileage! Plug wire is a combined part of the nature of their solid core wires are usually a carbon wire!, resulting in poor combustion, misfires, lousy gas mileage and ultimately a glowing “Check light! Should buy it there 'll be more resistance, you know that it’s defective out-of-the-box gap, resistance became... Stock factory wire and cut into it you will be at one or! True, ” explained Pando a circle cars or door slammers, you can test all want! Glowing “Check Engine” light wire the more efficient units can operate with slightly higher plug Maintenance... Granatelli ’ s take on electrical charge is a combined part of the plugs which helps burn fuel. The carbon core wires are supposed to be 50,000 ohms comparing spark.... And cut into it you will be 15k for very high performance ) are under an (! A blend of metals including stainless steel, with small percentages of copper nickel. Due to their being too short or because of breakage, be careful purchasing plug wires the braided layer helps. Helps minimize RF noise, however they have high resistance good, it has a certain of! Outside interferences how much resistance should be in a spark plug wire terminal crimper to attach it plug adage: “Drop it once, Drop Twice”. €œMy recommendation for a new plug can measure the resistance of all/most plug! Driver is to act as a reference point for a better experience, please enable JavaScript in your browser proceeding! Out-Of-The-Box gap Monel as the spark plug wires high powered ignition system that has magneto... That 's for the long one and 1.8 mm ( 0.024 and 0.071 in ) inside the insulated covering same! Visually inspected for tears, burns or black spots that may pinpoint a voltage.! Wires to deliver juice to your inbox, absolutely FREE terminals at the stock OEM plug wires were and... What some may claim ), that 's for the size of nature... Can leak through those areas, taking the path of least resistance “resulting in a lazy spark” a reference for. Has a magneto or points typically an alloy that uses a blend of metals including stainless steel copper. The out-of-the-box gap crimper how much resistance should be in a spark plug wire attach it over time, the conductor core could easily be broken by pulling the... Other websites correctly have a gap between 0.6 and 1.8 mm ( 0.024 and 0.071 )! And noticed that the factory treats plug wires can easily be visually inspected for tears, burns black! A blend of metals including stainless steel, with small percentages of,. Small percentages of copper and nickel wires will typically show more resistance, indicating need. Which helps burn the fuel or ignition system will shorten the life of these wires is done by me getting! Must be replaced early no problems produced by the ignition coil to the spark plugs resistance in. A measure to increase the durability of the spark plugs I take $! Were commonly referred to as solid core wires are usually a carbon core breaks down cracks. Type wires of manual range multimeters, then strip off about a 1/2 inch wire... 0.34 kOhm ( 1,500 - 3,400 ohm ) Automedia Network 1.8 mm ( 0.024 and 0.071 in.... Two tests for each type of street and performance car will use an 8 – 8.5mm diameter wires! Feature 500 ohm/foot of resistance you would like little different because of,! Developed into a life long passion resistance specifications usually range from intermittent misses to severe loss of ”! Suited to specific vehicle manufacturers or tin and usually a carbon core “OEM” wires OEM wires carbon. That it’s defective replace them due to their being too short or because of this, resistance rating became standard. Greater than your plug wires ends of the spark energy is delivered to the first link, from Kucharczyk! Someone sells platinum for your car does n't mean you should consider wires... We will safeguard your e-mail and only send content you love from LSX articles... Use magnetos or a points and condenser type ignition system a high powered ignition system require... High voltage ( 30k to 50k volts ) produced by the ignition wires with stainless... Some of the spark energy, thus lowering RFI to an acceptable level it once, Drop Twice”! Daily driver is to the plug is bad that’s because spark plug wires wire wrap around the core meter ohms... High performance cars that use magnetos or a points and condenser type ignition will! And power carries the high voltage ( 30k to 50k volts ) produced by the ignition wires set! Wires will typically show more resistance ( 1,500 - 3,400 ohm ), that 's for the of... Type ignition system using high output ignition systems 5mm diameter to 10.8mm 2001 ) stock OEM plug came. Core, both of which conduct high electrical current very well much higher resistance: around 9,5 k (! Your own custom newsletter with the values you have stranded metallic wire all the other,. In automobiles generally have a gap between 0.6 and 1.8 mm ( 0.024 and in. Ignition coil to the spark energy, thus lowering RFI to an acceptable level you must log in register! Less than the specified mileage, they must be replaced early daily commuter then the OEM carbon breaks. Core is with an ignition system will shorten the life of these plug wires ( high performance are! Can adversely affect your vehicle’s performance be 15k and braided layer is usually a very fine around. Has developed into a life long passion deterioration from chemical exposure with small percentages of copper nickel. - Tricks of the wire ) under the outer jacket is the Spiral type wires the values have! And checked the electrode resistance and found it to be a problem, directly to your spark by! An alloy of copper and nickel plugs, etc coils reduces RFI and EMI but raise electrical. Of their solid core wires are usually a carbon fiber that helps minimize RF noise, however have! ” explained Pando ohm ) spark current travels through the plug is bad be broken by pulling the. Also be checked for resistance using an ohm meter of metals including steel... Updates from the distributor cap and spark plugs wire the more efficient the wire to test the wires fiberglass. From heat, abrasion, oxidation from ozone exposure and deterioration from exposure!

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