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Kirkham Motorsports

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  #1 (permalink)  
Old 12-03-2022, 11:48 AM
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Cobra Make, Engine: Backdraft w/ 427IR
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Default Roush vs Ford Spark plug wires

My 427ir died pulling out of my neighbor. Started back up after a few tries but it was running like crap. I was able to make it back to the house. Before it died I checked each spark plug wire to be sure one didnít pop off. I donít recommend doing this with the engine running. The first wire I grabbed shocked the piss out of me. Long story short. I ordered new ford racing 9mm plug wires to replace the roush wires it came with. I was told the ford racing wires were a direct replacement. I checked the resistance in in both sets of wires. The old roush wires were ~400 ohms. The new ford wires measured ~4000 ohms. I thought I would see more resistance on the old wires???? Is this difference enough to worry about?

Appreciate the help. Mike
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  #2 (permalink)  
Old 12-03-2022, 11:55 AM
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Cobra Make, Engine: ERA 838 under construction, ERA 755 sold, ERA 178 sold
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4000 to 8000 ohms is normal

John

Last edited by Grubby; 12-03-2022 at 11:58 AM..
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Old 12-07-2022, 04:38 PM
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Cobra Make, Engine: BDR, Roush 402R
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Default ford racing wires

Quote:
Originally Posted by 169mph View Post
My 427ir died pulling out of my neighbor. Started back up after a few tries but it was running like crap. I was able to make it back to the house. Before it died I checked each spark plug wire to be sure one didn’t pop off. I don’t recommend doing this with the engine running. The first wire I grabbed shocked the piss out of me. Long story short. I ordered new ford racing 9mm plug wires to replace the roush wires it came with. I was told the ford racing wires were a direct replacement. I checked the resistance in in both sets of wires. The old roush wires were ~400 ohms. The new ford wires measured ~4000 ohms. I thought I would see more resistance on the old wires???? Is this difference enough to worry about?

Appreciate the help. Mike
This is ironic i just changed mine this week also, what i did not like is that the ford wires are too long on a couple of cylinders and have this ugly hump in wire routers , I am trying to find original MSD wires now they fit perfect . Dont be suprised you will have too drill wire routers (holders) for the larger wire
bingo2 and 169mph like this.

Last edited by BDR0572; 12-07-2022 at 04:41 PM..
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Old 12-07-2022, 05:02 PM
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I've had good luck, 20 years with Taylor. I make them up for length and routing. Choice of colors.
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