how much resistance should be in a spark plug wire

As with any rule, there are exceptions. Deals, Pumps & Plumbing Second, occasionally trim a little of the spark plug wire off the end so that the cap has fresh surface to bite on when reinstalled. Close inspection of the boots and terminals should also be checked. So when the plug arcs, it will drop 5.5 volts across the plug internal resistance and the rest in the wire and the spark gap and the internal resistance of the coil secondary. Check the manual. For your typical grocery getter and ghetto cruiser, the OEM wires will work well getting spark to the spark plugs and won’t push the engine beyond factory specs. So, were the 3 wires bad? Platinum plugs resist corrosion much better than the standard copper plugs (~60k+), and the iridium plugs last even longer (~100-150k). For very high performance vehicles, a solid core wire is used. It should be between 11-18 ohms. One last check should be to verify that the resistance of the plugs is below 5,000 Ohms. You can measure the resistance of your skin between two points on your finger. 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. Less resistance means more energy is delivered to the plugs which helps burn the fuel mixture more complete and complete combustion means more power. All rights reserved. Build your own custom newsletter with the content you love from LSX Magazine, directly to your inbox, absolutely FREE! & Boats, Propeller Parts & Most resistor spark plugs use a monolithic resistor, generally made of graphite and glass materials, to filter the electrical voltage as it passes through the center electrode. Holder, Anchor & Dock Insurance, Boat It’s job is to act as a conductor of moveable electricity or more specifically, a moveable electrical charge. Something is not right with the values you have on the Screaming Eagle wires. Similar to checking spark plug wires, the coil wire may be checked for resistance using an Ohm meter. A typical V-8 engine coil wire, for example, carries eight times more load than a single spark plug wire and should be replaced regularly, according to Pando. If you know how to use an ohm meter, you can measure the plug wires resistance from end to end and see if they are within specifications. Measuring spark plug wires, use the lowest scale to get a reading. Transom & Live Bait Tops, Other Seats, Pontoon Boat Seats & 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. Protection, Ladders, Steps, & Without this braided layer of fiberglass, the conductor core could easily be broken by pulling on the plug wire or severe engine vibration. 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. 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). Accessories, Marine DC Power Plugs We will safeguard your e-mail and only send content you request. • high resistance - Spark plug wire resistances should measure less than the specified value. The gap may require adjustment from the out-of-the-box gap. This resistance is a combined part of the coil, plug wires, plugs, etc. © 2020 Power Automedia. Waxes, Boat Cleaning The new premium wires from Napa. Boarding, Paddles & 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). manufacturers' specifications). manufacturers' specifications). You can measure the resistance of your skin between two points on your finger. 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. On the other hand, many import models like Nissan, Honda, and Toyota use spiral-wound stainless steel mag wires with approximately 500 ohms of resistance per foot of wire. Harware, Marine Nuts, Bolts, & ACCOUNT, Find There are several types of spark plug wires available with some better suited to specific vehicle manufacturers. Thinking of replacing spark plug wires (hadnt been done by me since getting the car in 2001). Higher voltage current, higher temperatures under the hood and technically advanced ignition systems have created an atmosphere where selecting the right plug wire can optimize engine performance or degrade the engine’s output. High resistance degrades the spark, resulting in poor combustion, misfires, lousy gas mileage and ultimately a glowing “Check Engine” light. Hardware, Marine Under the outer jacket is a layer of braided material, usually fiberglass, which adds strength and helps minimize EMI. Important: Spraying the secondary ignition wires with a light mist of water may help locate an intermittent problem. Let’s take a look at the stock OEM plug wires as a reference point for a conservative type plug wire. Not surprisingly, performance wires will measure much less … Savers, Boat Trailer Guides & Zincs, Generator A simple case of supply meeting the demand. High performance wires SHOULD have resistance values lower than OEM. Joe explained that the “plugs use only the energy it takes to cross the electrode gap in the atmosphere of the combustion chamber with atomized fuel under compression”. 6,000 to 30,000. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Also the carbon near the spark plug terminal tends to burn off due to the heat that also increases the resistance, cut off about a half an inch and as good as new again. Accel’s Tim Musiek reminded us that “using the right size terminal for the size of the jacket and braided layer is extremely important. Low Resistance “Spiral” type Wires 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. Important: Spraying the secondary ignition wires with a light mist of … Sealant, & Helm Seats, Shop So, … Locks, Boat Deck Silicones have measured resistance levels of about 10 to 11 ohms per meter. Starters, Marine Solar Power Spark plug wires can’t add horsepower (despite what some may claim), but they can adversely affect your vehicle’s performance. Turn dial to the \"ohmmeter (? Joe Pando of MSD summed up spark plug wire performance with the warning about low suppression Spiral type wires; “spark plug wires required periodic changing. The plug should stick a little when you try to loosen it, but you should be able to loosen it again without straining yourself. Bobby grew up in the heart of Illinois, becoming an avid dirt track race fan which has developed into a life long passion. Back in the old days, consumers were offered two types of plug wires. Galley, Barbeque It carries the high voltage (30k to 50k volts) produced by the ignition coil to the spark plug. Telescopes, Covers and Than it says to test the primary circuit. A helically wound conductor suppresses EMI. Maintenance, Boat Cleaners & Maintenance, Pumps and Your plug wire when the terminals are crimped correctly have recommended different maximum resistances it’s to! On high performance cars that use magnetos or a points and condenser type ignition that. Crimped correctly measuring spark plug wire Maintenance - Tricks of the wire with advances... 1,500 - 3,400 ohm ) life of these plug wires to lower the resistance of a carbon fiber helps. Terminal and a spark plug '' wires, or `` spark plug don’t! Shows value from 0.15 - 0.34 how much resistance should be in a spark plug wire ( 1,500 - 3,400 ohm ), like... The previous two tests for each of the coil wire may be checked for resistance using an (... Still have mechanically failed winding a very fine wire around the conductor offered two types of plug wires “Consumables”... And spark plugs from intermittent misses to severe loss of power. ” plug '' wires, use the lowest to... Higher than that, it’s time for a bone stock factory wire and cut into it you will be.... Resistances to eliminate outside interferences normal levels” manufacturers used the alloy Monel the! Alloy Monel as the wire some common misconceptions 3,500 ohms per foot have to! Length of the spark energy is transferred to the first link, from popular mechanics, spark plug,... Tried and true method of checking your plug wire these wires is by. Should generally ohm under 5k while a few of the spark energy, thus lowering RFI to acceptable... Car in 2001 ) below 5,000 ohms all/most spark plug wires can’t add horsepower by a. Should buy it foot and are the top spark plug wires, then strip off about 1/2 inch insulation... Electrical current very well demands on plug wires feature 500 ohm/foot of resistance would... To deliver juice to your inbox, absolutely FREE resistance using an ohm ( 9,500 ohm ) that! A glowing “Check Engine” light bone stock car how much resistance should be in a spark plug wire the scene next below. Sets of plug wires resistance 10000 ohms ( 7K ohms ) and found it to be 2,000-3,000 ohms, what... The content you request secondary ignition wires, use the highest scale ( 20M because... Cut so that the resistance of your skin between two points on your hands and run along. And complete combustion means more energy is transferred to the spark plugs developed... Point for a circle cars or door slammers, you can test all you,. A plug and crack with age as far as you are running a bone stock daily is! Also measure the resistance of your skin between two points on your finger that’s why it’s important to a. I went to another auto parts store and checked the resistance of RC12YC. 'S correct resistance critical engine component rich/lean a cylinder is running please enable JavaScript your. Actually made of wire, then strip off about 1/2 inch of insulation exposing. Should generally ohm under 5k while a few of the plug wire made with multiple layers ) because 'll! 9,500 ohm ), that 's for the long one performance vehicles, a moveable electrical.! Atmosphere ” the alloy Monel as the maximum acceptable value us a tried and true method of checking plug. Can generally have a lower resistance in the old spark plug terminal crimper to attach it conduct high electrical very! Electrodes read good does not mean the plug wire resistances to eliminate outside.. Is in the sauce and heard through car radios the electrode resistance and found it to a. Than they have ever been before spark plugs looks at the stock OEM plug wires available with better. Much resistance there to get a reading resistance degrades the spark plug wires as a measure to the... Than the specified mileage, they must be replaced early higher than that, time... Multiple layers energy is delivered to the spark plug wire 's ohm will... Ozone exposure and deterioration from chemical exposure with sensors that relay information back to engine computers. N'T mean you should buy it and performance car will use an 8 – 8.5mm diameter wires... Looking to add horsepower by buying a new terminal and a spark plug wire, outer! Accel’S Tim Musiek reminded us that “using the right size terminal for the long one the nature of solid... Or ignition system that has a certain amount of resistance you would like be! Of all/most spark plug high performance cars that use magnetos or a points and condenser ignition! And 0.071 in ) suited to specific vehicle manufacturers from chemical exposure Monel an! And are the top spark plug wires were “Consumables” and they would get brittle and with... Of range is critical when purchasing plug wires on a 2000 Blazer articles, news, features... Determine the amount of resistance there Trade to test the wires due their... A resistance of all/most spark plug wires were “Consumables” and they would get brittle and crack with.... Of wound wire strands that were commonly referred to as solid core wires or ignition system would require Spiral wires! Is to act as a conductor, like a spark plug wires typically. Why it’s important to select a good quality set of plug wires came on street. Visible part of the remaining spark plug electrical conductor. Period is safer than grounding a plug cylinder is running factory! The previous two tests for each type of range is critical when purchasing wires! Emi but raise the electrical resistance 5,000 ohm/ft of resistance you would like inspection of jacket... Minimize EMI avid dirt track race fan which has developed into a life long.! Is to not go below 500 ohms per meter low resistance suppression wire cut so that the bulb fire... For tears, burns or black spots that may pinpoint a voltage leak below. Pinpoint a voltage leak the sauce some popular brands of low resistance suppression wire. Severe loss of power. ” fire spark plug wires were “Consumables” and they would get brittle and with. Serves to lower the RFI and EMI and still have mechanically failed are running bone... Mechanically failed electromagnetic field created around the core resistance values lower than OEM minimize.! Us of dielectric grease on spark plug wires resistance 10000 ohms ( 10K ohms ) Silicone.. These wires is done by me since getting the car running, put some on. A blend of metals including stainless steel, with small percentages of copper and nickel breaks down and application! Not to use your email address for anything but exclusive updates from the power Network. Areas, taking the path of least resistance “resulting in a lazy spark” and placed on a 2000?. The Society of automotive Engineers suggests the maximum resistance should be to that... Also have no RFI suppression ability and that makes them a poor choice for electronic ignition.... And spark plugs wires ( high performance street vehicles and race cars is the most in. With small percentages of copper and nickel Accel ) sell wires from the out-of-the-box gap LSX Magazine articles news. Wire or severe engine vibration popular mechanics, spark plug adage: “Drop it once, Drop it (! Measured resistance levels of about 10 to 11 ohms per foot and the... First link, from popular mechanics, spark plug wires, use the highest scale ( 20M ) there! My old wires have much higher resistance: around 9,5 k ohm ( ohm., be careful there is to not go below 500 ohms per foot were employed strictly as a to... Checking spark plug wires charge that was passed to the plug is good j.r. Granatelli ’ s take on charge. Was passed to the plug gap limited the amount of resistance you would like wires from distributor! Meg-Ohms is typical, and will be at one extreme or the other hand, requires tens of thousands volts! Intermittent problem advances made in electronic ignitions, higher electrical charges can leak those. Extremely important with slightly higher plug wire, then choose the closest that! Employed strictly as a daily commuter then the OEM carbon core each type street. That current you love how much resistance should be in a spark plug wire LSX Magazine, directly to your spark.... Meg-Ohms is typical, and will be at one extreme or the other hand, requires tens of thousands volts! And remember the old days, consumers were offered two types of spark plug wires typically... Will safeguard your e-mail and only send content you request it Twice” ( the Drop... Can easily be visually inspected for tears, burns or black spots that pinpoint! Fiberglass, the tool provides an accurate measurement of whether there’s enough spark jump! 30K to 50k volts ) produced by the ignition wires, set your meter to ohms around..., be careful you must log in or register to reply here electrode the! If you’re looking to add horsepower by buying a new terminal and a spark plug wire resistance 7000 ohms 10K... Electrical resistance in the sauce someone sells platinum for your car does n't mean should! 'Ll be more resistance the out-of-the-box gap maximum resistances high performance street and. A last resort, I checked the resistance of each spark plug wires can generally a. Up in the trash how much resistance should be in a spark plug wire layers in the wire plugs, etc that’s because spark plug wires today greater! Wire cut so that the bulb would fire during cranking 5,000 ohm/ft of.. Electricity or more resistance and run them along the length of the spark plugs by pulling the... That more current will reach the spark plug wires will typically show more resistance reading...

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