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02-13-2019, 09:05 PM | #1 |
Member
Join Date: Dec 2018
Location: Syracuse, NY
Posts: 51
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Radio Frequency Interference
Recently I noticed that an LED flashlight I was using near the engine flickered whenever the engine was running... the closer I held it to the distributor the more profound the flicker. Then I turned the LED shop light on, easily 8' from the car, it also flickered. I suspected some sort of EMI was causing the trouble. All ignition was stock except for modern points /condenser.
In a move to minimize the RFI I changed to a modern dist. cap but found that the wires that came in that kit were solid and didn't reduce the interference at all, so I did some digging and found that spiral wound ignition wires are intended to cut emissions with very little current loss. 20190213_200206r.jpg I bought a set of cut-as-needed cables and fit them to the new cap and plugs. Voila! NO RFI, not even if I hold the LED flashlight 1/4" from them. At first glance I'm very pleased, she fired right up, idles and performs just right. And I can use my electronics, LEDs, etc. without risk of EM damage. YMMV, but am posting this for what it's worth.
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Cave Luther Syracuse, NY 1931 Deluxe Coupe (Rose) ______________________________________ "... I'm pullin' for ya, we're all in this together." Red Green |
02-14-2019, 12:29 PM | #2 |
Senior Member
Join Date: May 2010
Location: Tacoma, WA
Posts: 1,025
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Re: Radio Frequency Interference
So..........I'm not a "Sparktrician" . Would there be issues if a car has LED tail lights and now the new LED head lights?
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02-14-2019, 01:26 PM | #3 |
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Join Date: Dec 2018
Location: Syracuse, NY
Posts: 51
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Re: Radio Frequency Interference
I noticed some comments on the early V8 page that indicated just such issues, but I can't speak to them directly.
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Cave Luther Syracuse, NY 1931 Deluxe Coupe (Rose) ______________________________________ "... I'm pullin' for ya, we're all in this together." Red Green |
02-14-2019, 03:53 PM | #4 |
Senior Member
Join Date: Dec 2017
Location: Guthrie, OK
Posts: 1,144
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Re: Radio Frequency Interference
Thanks for posting, Cave. Something I was unaware of. Great detective work and perfect (only?) solution. Good point to add to the (-) side of the led discussion.
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02-14-2019, 10:00 PM | #5 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,406
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Re: Radio Frequency Interference
LED's are susceptible to RFI.
A small (.01) ceramic disk capacitor placed across the input terminals will sometimes cure the problem. It depends on the interference level. Last edited by Pete; 02-15-2019 at 12:24 PM. |
02-14-2019, 11:13 PM | #6 | |
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Re: Radio Frequency Interference
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Quote:
And in the case of the replacement bulbs, quality of design and manufacture.
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