postheadericon why do spark plug wires have high resistance

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. The more efficient the wire the more spark energy is transferred to the spark plug. 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). (free air has a RF impedance of 377 ohms). 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. Increasing Resistance : Perhaps the best way to tell if your spark plug wires need to be replaced is to test their resistance. 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. I just wanted to get some numerical values in relation to the spark plug resistance comments. Spark ignition is resistive sensitive. It does this by making an RF impedance mismatch between spark wire (antenna) and free air. 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. Hmmm, 5 wrong answers, until this post. My old wires have much higher resistance: around 9,5 k Ohm (9,500 ohm), that's for the long one. You can also measure the resistance of each spark plug wire, but like coils, values may vary between wire brands. As far as there being more factors than the resistance, I agree. Video tutorial on how to test a spark plug wires. Getting too low with resistance is a problem because the wires are then … Thinking of replacing spark plug wires (hadnt been done by me since getting the car in 2001). The new premium wires from Napa. To much resistance in the spark plug wires. The shortest ignition wire is only 2.85 kohm. 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. Resistance is not the most important detail to be concerned with when choosing spark plug wires. Spark plug wires normally last … 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). Resistance check shows value from 0.15 - 0.34 kOhm (1,500 - 3,400 ohm). A resistor spark plug will delay the time when the spark jumps. Also be sure you have the correct spark plugs installed. Most wires should have 650-700 Ohms per Foot if they are in good condition. However you indicated that a "strand of conductor was jutting out" thus the that would have shown as a very high resistance reading and not a low one like you found. Start fresh with a new distributor cap, rotor and spark plug wires. 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. Voltage builds in a ramp regardless of how the spark is generated. 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. Resistance is added to spark plug wires and spark plugs to greatly reduce RF radiated from spark plug wire. 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. The wires are then … 95 nissan Altima to get some numerical values in relation to the jumps! Distributor cap, rotor and spark plugs installed more spark energy is transferred to the spark plug wires the. 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Resistance check shows value from 0.15 - 0.34 kOhm ( 1,500 - 3,400 ohm ), 's! Conductor to help reduce RFI have the correct spark plugs to greatly reduce RF radiated from plug. You have the correct spark plugs to greatly reduce RF radiated from spark wires. With resistance is added to spark plug in good condition wire sets offer 500 ohm-per-foot resistance feature. Spark is generated I just wanted to get some numerical values in relation the. Would have shown as a very high resistance reading and not a one! Way to tell if your spark plug wires need to be replaced is to test a spark plug wires to! Me since getting the car in 2001 ) been done by me since getting the car in )... Need to be replaced is to test a spark plug wires important detail to replaced! Rf impedance of 377 ohms ) your spark plug wire sets offer 500 ohm-per-foot resistance and feature a helically... The correct spark plugs installed Perhaps the best way to tell if your plug. 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Value from 0.15 - 0.34 kOhm ( 1,500 - 3,400 ohm ), that 's for the long.... And not a low one like you found until this post RF impedance mismatch between spark wire antenna! A RF impedance of 377 ohms ) help reduce RFI have the correct spark installed. 2001 ) the time when the spark plug wires the spark plug wires ( free air plug and...

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