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Spark plug wire for tubes with a top cap?
Spark plug wire for tubes with a top cap?
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Old 15th September 2020, 05:20 PM   #1
Windcrest77 is offline Windcrest77  United States
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Default Spark plug wire for tubes with a top cap?

Spark plug wire has well thought insulation layers very high dielectric strength, its very flexible, the boots can be repurposed to grommet into the chassis, and it looks cool and safe to the touch due to its thick insulation.

Construction-wise, there is straight copper wire, carbon core, spiral wound types and other methods of EMI reduction.


Do you think the straight copper spark plug wire would be a good choice for top capped tubes?
The wire I have just looks so dinky coming off a top cap. I'd replace the actual terminal to the tube with the correct size for the tube of course, or just fix a proper sized ceramic boot.


Constructions:

Getting Wired: Spark Plug Wires 101

A typical copper core set:

Amazon.com: JDMSPEED New 10.5mm Spark Plug Wire Set Replacement for HEI SBC BBC 350 383 454 Electronic: Automotive

Last edited by Windcrest77; 15th September 2020 at 05:31 PM.
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Old 15th September 2020, 05:58 PM   #2
Eli Duttman is offline Eli Duttman  United States
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Quote:
Do you think the straight copper spark plug wire would be a good choice for top capped tubes?
The short answer is yes. A concern is present. Low purity, "tough pitch", copper can contain copper oxide micro diodes that cause distortion. Obviously, "super duper" OFC cabling will not be used for spark ignition. Whether or not the copper used is pure enough is (IMO) an open question.
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Old 15th September 2020, 06:02 PM   #3
HollowState is offline HollowState  United States
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I prefer to use wire like Belden test probe wire. It's flexible and has 5KV rated insulation for the type 8899 or the type 8898 10KV. Engine ignition wire is unnecessary overkill and may have resistance properties to reduce noise.
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Old 15th September 2020, 06:14 PM   #4
wrenchone is offline wrenchone  United States
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I use 18 AWG silicone slot car wire - it's nice and limp and comes in a wide range of colors. It doesn't have a specific voltage rating, but the insulation is rather thick, and being silicone, will stand up to heat and not get brittle with age. 18AWG is just the right size to fit in the hole of your usual plate cap.
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Old 15th September 2020, 06:26 PM   #5
Windcrest77 is offline Windcrest77  United States
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Insulation is very thick on a 7mm wire, that's the part I like. I may get a roll of this stuff and some straight rubber boots to grommet through the chassis with. And use the regular ceramic caps I already have for the tube end.

Amazon.com: Red 7mm Solid Core Spark Plug Wire, 20 Ft.: Automotive
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Old 15th September 2020, 06:58 PM   #6
Demonkleaner is offline Demonkleaner  United States
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Says it's solid core but is it solid copper?

If not there could issues soldering it.
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Old 15th September 2020, 07:09 PM   #7
jjasniew is offline jjasniew  United States
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Perhaps if the tube is running class A, the copper oxide micro diodes wont matter much...
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Old 15th September 2020, 07:11 PM   #8
kodabmx is offline kodabmx  Canada
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Spark plug wire for tubes with a top cap?
Quote:
Originally Posted by Windcrest77 View Post
Spark plug wire has well thought insulation layers very high dielectric strength, its very flexible, the boots can be repurposed to grommet into the chassis, and it looks cool and safe to the touch due to its thick insulation.

Construction-wise, there is straight copper wire, carbon core, spiral wound types and other methods of EMI reduction.


Do you think the straight copper spark plug wire would be a good choice for top capped tubes?
The wire I have just looks so dinky coming off a top cap. I'd replace the actual terminal to the tube with the correct size for the tube of course, or just fix a proper sized ceramic boot.


Constructions:

Getting Wired: Spark Plug Wires 101

A typical copper core set:

Amazon.com: JDMSPEED New 10.5mm Spark Plug Wire Set Replacement for HEI SBC BBC 350 383 454 Electronic: Automotive
Spark plug wire is about 1 kilohm per foot for current limiting of the spark (unless that changed) and usually uses carbon wire. I recommend heater cord Amazon.com: Power cord, 8', HPN 16/2, fits Heaters and Irons Must be Hardwired: Home Audio & Theater unless you are talking over 600V, in which case This: High Voltage Silver Plated Copper PTFE 20 AWG Wire 13 KV Gore F01B080 5 ft | eBay might do
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Last edited by kodabmx; 15th September 2020 at 07:14 PM.
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Old 15th September 2020, 07:14 PM   #9
astouffer is offline astouffer  United States
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Many years ago I cut open a spark plug wire and the inside was mostly carbon strands. Don’t even recall seeing copper.
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Old 15th September 2020, 07:20 PM   #10
50AE is offline 50AE  Bulgaria
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Spark plug wire for tubes with a top cap?
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