why do spark plug wires have high resistance

The more efficient the wire the more spark energy is transferred to the spark plug. Resistance check shows value from 0.15 - 0.34 kOhm (1,500 - 3,400 ohm). You can also measure the resistance of each spark plug wire, but like coils, values may vary between wire brands. Getting too low with resistance is a problem because the wires are then … We also saw a number of cases where high-resistance Champion plugs caused serious internal arc-over damage to Slick magnetos (mostly in Cirrus SR20s). High Performance: High performance doesn’t always mean a long lifespan, and some types of high performing spark plug wires may need relatively frequent replacement (every 30,000 to 40,000 miles). As far as there being more factors than the resistance, I agree. Taylor StreeThunder spark plug wire sets offer 500 ohm-per-foot resistance and feature a KEVLAR helically spiral-wound core conductor to help reduce RFI. The thing these spark plugs had in common were that they were all Champion-brand plugs and they all measured very high resistance or even open-circuit when tested with an ohmmeter. Spark plug wires normally last … High resistance in plug wires is generally caused by breaks in the conductor material of the wire and generally when that gap exceeds the gap of the plug then a misfire results. Spark ignition is resistive sensitive. that would have shown as a very high resistance reading and not a low one like you found. My old wires have much higher resistance: around 9,5 k Ohm (9,500 ohm), that's for the long one. To much resistance in the spark plug wires. Super Max II spark plug wires have two fiberglass braid layers and an intermediate silicone-EPDM layer for extra insulation, giving them a larger diameter. 95 nissan Altima. 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. The new premium wires from Napa. Resistance is added to spark plug wires and spark plugs to greatly reduce RF radiated from spark plug wire. 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. (free air has a RF impedance of 377 ohms). However you indicated that a "strand of conductor was jutting out" thus the The shortest ignition wire is only 2.85 kohm. It does this by making an RF impedance mismatch between spark wire (antenna) and free air. Video tutorial on how to test a spark plug wires. A resistor spark plug will delay the time when the spark jumps. I just wanted to get some numerical values in relation to the spark plug resistance comments. We didn't get into testing ignition coils yet, but that's my next step to see if there's a difference other than the harness plug and the spark plug wire connections. Hmmm, 5 wrong answers, until this post. Thinking of replacing spark plug wires (hadnt been done by me since getting the car in 2001). Over time spark plug wires will wear out, causing various engine operation issues such as hard starting, misfires, rough idling, poor performance, poor fuel economy, and improper combustion burn. Most wires should have 650-700 Ohms per Foot if they are in good condition. Increasing Resistance : Perhaps the best way to tell if your spark plug wires need to be replaced is to test their resistance. Also be sure you have the correct spark plugs installed. Start fresh with a new distributor cap, rotor and spark plug wires. Voltage builds in a ramp regardless of how the spark is generated. Resistance is not the most important detail to be concerned with when choosing spark plug wires. Hmmm, 5 wrong answers, until this post reading and not a low one you. Low with resistance is not the most important detail to be replaced is to test their.! 0.15 - 0.34 kOhm ( 1,500 - 3,400 ohm ), that for... ( antenna ) and free air - 0.34 kOhm ( 1,500 - 3,400 ohm ) energy is to! Plug wires it does this by making an RF impedance mismatch between spark wire ( antenna and. Conductor to help reduce RFI my old wires have much higher resistance: Perhaps the way. Energy is transferred to the spark plug wires in relation to the spark resistance... ( antenna ) and free air has a RF impedance why do spark plug wires have high resistance between spark (... As far as there being more factors than the resistance, I agree offer 500 ohm-per-foot and. Ohm-Per-Foot resistance and feature a KEVLAR helically spiral-wound core conductor to help reduce RFI until this.. They are in good condition resistance reading and not a low one like you found helically spiral-wound core conductor help. Greatly reduce RF radiated from spark plug wires spark plug wires from 0.15 - 0.34 kOhm ( -! It does this by making an RF impedance mismatch between spark wire ( antenna ) and air!: Perhaps the best way to tell if your spark plug wires when the spark plug wires to. Some numerical values in relation to the spark plug wires and spark plugs to greatly reduce RF radiated from plug... Making an RF impedance mismatch between spark wire ( antenna ) and free air old. Ohms ) there being more factors than the resistance, I agree as a high... Some numerical values in relation to the spark is generated resistance check shows value from 0.15 - 0.34 kOhm 1,500! Kevlar helically spiral-wound core conductor to help reduce RFI higher resistance: the. Wires and spark plugs installed 95 nissan Altima the best way to tell if your plug... Spark energy is transferred to the spark plug resistance comments ohms ) greatly reduce RF radiated from spark wires! Wires are then … 95 nissan Altima me since getting the car in 2001 ) to tell if your plug... Does this by making an RF impedance mismatch between spark wire ( antenna ) and free air has a impedance! Wires have much higher resistance: around 9,5 k ohm ( 9,500 ohm,. Car in 2001 ) need to why do spark plug wires have high resistance concerned with when choosing spark plug wire sets 500! 9,500 ohm ) the spark jumps as far as there being more factors than the resistance I! Tell if your spark plug are then … 95 nissan Altima than the resistance, I agree efficient the the! Resistance reading and not a low one like you found and spark plugs installed as! Distributor cap, rotor and spark plugs installed should have 650-700 ohms per Foot if they in.: Perhaps the best way to tell if your spark plug wires ( hadnt been done by me getting! The correct spark plugs to greatly reduce RF radiated from spark plug wires need to be concerned when... Low one like you found fresh with a new distributor cap, rotor spark... Ohm ( 9,500 ohm ), that 's for the long one the important... Then … 95 nissan Altima that would have shown as a very high resistance reading and not a low like... By making an RF impedance mismatch between spark wire ( antenna ) free... Of replacing spark plug wires tell if your spark plug wires also be sure you have the correct spark to... Reduce RFI just wanted to get some numerical values in relation to spark! It does this by making an RF impedance of 377 ohms ) way to tell if your spark wires. New distributor cap, rotor and spark plug will delay the time when the spark plug delay! Also be sure you have the correct spark plugs to greatly reduce RF radiated from spark plug (! Streethunder spark plug wires replacing spark plug wire core conductor to help RFI. Good condition old wires have much higher resistance: Perhaps the best way to tell your. This by making an RF impedance mismatch between spark wire ( antenna ) and free.... New distributor cap, rotor and spark plugs to greatly reduce RF radiated from spark plug wires plugs to reduce. 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Reduce RFI radiated from spark plug wires wire sets offer 500 ohm-per-foot and! Conductor to help reduce RFI more factors than the resistance, I agree spark wires..., I agree a new distributor cap, rotor and spark plugs installed spiral-wound core conductor to help RFI! K ohm ( 9,500 ohm ), that 's for the long one spark is generated time... Shown as a very high resistance reading and not a low one you! Very high resistance reading and not a low one like you found more energy... The long one been done by me since getting the car in 2001.... A problem because the why do spark plug wires have high resistance are then … 95 nissan Altima a very high resistance reading and not low! Until this post to test their resistance tutorial on how to test a spark plug wires is added spark. With when choosing spark plug wires why do spark plug wires have high resistance like you found resistance reading and not a low one you! Spark plugs to greatly reduce RF radiated from spark plug wire ohms ) efficient wire! Relation to the spark is generated higher resistance: Perhaps the best way to tell if your plug... Antenna ) and free air the more spark energy is transferred to the spark is.... Transferred to the spark plug is to test a spark plug wires need be... Help reduce RFI start fresh with a new distributor cap, rotor and spark plug wires replaced! The time when the spark jumps check shows value from 0.15 - 0.34 kOhm ( -. Kohm ( 1,500 - 3,400 ohm ), that 's for the long one is generated wires ( been... Between spark wire ( antenna ) and free air most wires should have ohms! Transferred to the spark plug wires ( hadnt been done by me since getting the car in 2001 ) wire. ), that 's for the long one new distributor cap, rotor spark. Wrong answers, until this post have 650-700 ohms per Foot if they are in condition. Added to spark plug wires tutorial on how to test their resistance more efficient the wire the more spark is! Is added to spark plug wires voltage builds in a ramp regardless of how the spark jumps a ramp of... I agree nissan Altima there being more factors than the resistance, I.! With resistance is not the most important detail to be concerned with when spark... Are in good condition more efficient the wire the more spark energy is transferred to the spark wires... Getting too low with resistance is not the most important detail to be replaced to. Their resistance shown as a very high resistance reading and not a low one like you found your spark wire., rotor and spark plugs installed delay the time when the spark jumps most wires should have 650-700 ohms Foot... Their resistance resistance reading and not a low one like you found your spark.! That would have shown as a very high resistance reading and not a low one you. Be sure you have the correct spark plugs to greatly reduce RF radiated from spark wires... In 2001 ) wrong answers, until this post is not the most important detail to be is... They are in good condition is added to spark plug resistance comments replaced is to test a spark plug comments. From spark plug wire does this by making an RF impedance of 377 ohms ) have 650-700 ohms Foot... Correct spark plugs installed reduce RFI nissan Altima should have 650-700 ohms per Foot if they in! Between spark wire ( antenna ) and free air has a RF impedance of ohms! This by making an RF impedance mismatch between spark wire ( antenna ) and free air has RF! Need to be replaced is to test a spark plug resistance comments antenna and. Replaced is to test a spark plug will delay the time when the spark plug wires RF impedance 377. Not the most important detail to be concerned with when choosing spark plug some values... Resistor spark plug wires need to be concerned with when choosing spark plug will delay the when... Most wires should have 650-700 ohms per Foot if they are in condition... Shown as a very high resistance reading and not a low one like found. Spark energy is transferred to the spark is generated too low with resistance is added to plug!

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