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Best plug wires for noise suppression

Discussion in 'Engine & Performance' started by SquareRoot, May 14, 2020.

  1. SquareRoot

    SquareRoot Full Access Member

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    Ever since swapping to PF4 from a carb and HEI I have had very bad ignition static in my stereo system.

    I have been to hell and back troubleshooting the source of the noise and have concluded due to the process of elimination, my existing plug wires might be the issue.

    I'm using Summit brand 8mm, resistor, low ohm wires and AC Delco resistor plugs.

    Since I need to change plug wires anyway, I'm willing to buy the best quality wires I can get.

    All opinions and feedback are greatly appreciated.
     
  2. The88

    The88 What's broken this time?

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    Check all of your grounds. Usually noise in a radio is grounding issues somewhere. If that doesn't work you can always install a noise filter.
     
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  3. SquareRoot

    SquareRoot Full Access Member

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    Done all of that numerous times. No joy.
     
  4. The88

    The88 What's broken this time?

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    Thought about ground loop isolator? That would clean the radio up
     
  5. Crispy

    Crispy Full Access Member

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    Only problem I find with the isolators is a reduction in sound quality after install.

    What are the specs of your sound system?
     
  6. SquareRoot

    SquareRoot Full Access Member

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    Yes. No change. Inline filter on power source- no change.

    Removed the entire stereo from truck and installed a borrowed system- no change.

    Ran the entire system off s remote battery- no change.

    Unhooked the alternator and pulled the main 100 amp fuse- no change.

    Ran the remote fuel sump off a remote battery- no change. Unhooked the radio antenna- no change.

    Spent $80 on high end twisted pair, 3 layer RCA patch cables- no change.

    All components run power and ground to one common point directly from the batt terminals- no change.

    I'm open to suggestions but I, nor anyone I know, can figure it out.

    The best clue is that there was absolutely zero noise in the system prior to swapping to the efi system. The efi uses a different distributor (hall effect vs. the HEI module) and a hot (MSD Blaster 2) coil.

    The only thing that didn't change was the Summit brand plug wires.

    I would gladly give someone $100 bill if they could tell me what it is.
     
  7. nabeshin

    nabeshin functioning lunatic

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    I believe the low ohm wires are the problem. Try a cheap set of standard ones, or put the old ones back on.

    This is from one of Summit's blogs:

    "
    Carbon Core: This is the common OEM-style core used on most modern vehicles. It offers excellent RFI suppression but also creates more resistance than other styles. In addition, carbon core breaks down more quickly than other materials so they require relatively frequent replacement.

    Solid Core: Solid core spark plug wires typically utilize stainless steel or copper, which conducts electrical current very well. For that reason, solid core wires have lower resistance than other wires to get maximum energy to the plugs. Unfortunately, solid core offers very little EMI/RFI suppression, so they’re not suited for electronic ignition systems or vehicles with sensitive communications equipment.

    Spiral Core: Spiral core spark plug wires incorporate an alloy—usually consisting of stainless steel, copper, and tin—wrapping the core to suppress EMI/RFI while maintaining low resistance. As with everything, there is a delicate balance. More wire coils around the core will reduce noise but raise resistance of the wire.

    "
     
  8. SquareRoot

    SquareRoot Full Access Member

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    There are no old ones. The current ones have about 2k miles on them.

    MSD makes some high end 8.8 mm wires specifically for noise suppression. I'm just not thrilled to shell out $116. I'd feel better if I was positive the plug wires are the issue.
     
  9. Frankenchevy

    Frankenchevy Supporting Member Supporting Member

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    These are what I have. Tried them and the 8.5mm MSD super conductors. Both have worked well for me. Iirc, the super conductors were $90 for the set. Buuut...I don’t have a stereo. Just best to keep rfi in check with efi and computer controlled electronic ignition.

    I just like trying new stuff.
     
  10. QBuff02

    QBuff02 I like Big Blocks and I cannot lie Supporting Member

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    I am running Taylor Spiro-Pro 8mm plug wires with a full MSD Ignition and have had very good luck with them. The only reason I didn't put the MSD wires on is the Taylors were literally brand new right before I rebuilt the engine. Which bushing are you running in your HEI? I would recommend the MSD low resistance bushing if you aren't already. Part# 8412 The stock carbon bushing has a TON of resistance and this one has literally ZERO. Mine was like .12ohms when I checked it before I installed it. Although generally the high carbon factory bushings are supposed to help with noise suppression, sometimes when you add hotter ignition components you can run into increased problems with interference.
     
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  11. 82sbshortbed

    82sbshortbed Get outta there! Supporting Member

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    This guy gives you a lot of stuff to check. Seems like you've done good with better rca wires but, as said before grounds have to be good and big enough wire. Hope this helps.

     
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  12. SquareRoot

    SquareRoot Full Access Member

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    Fixed it!!!

    Eliminated the static 100%. Still not sure what's causing it but my suspicion in RFI from the plug wires. I still plan to install some high quality wires.

    But for now, I'm happy as a clam.
    Screenshot_20200516-200614_resized.jpg
     
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  13. 86SuburbanCCC-SSS

    86SuburbanCCC-SSS Junior Member

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    I was reading your thread just for fun, and sitting here thinking what early Dolby house hold stereo bit could be reused in this case. Another million dollar idea down the drain
     
  14. olnick

    olnick Member

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    Have access to an O scope? That will tell you exactly where the noise is being generated from. Is it from ALL THE wires or just a tic tic from one? The EFI will be affected with the noise as well find it and eliminate it. A good man on the scope will have your answer in just a few minutes checking it out!

    Olnick
     
  15. alphiesob

    alphiesob Junior Member

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    Another vote for the Taylor Spiral Core Wires, they work great on my amped up HEI. The post about Car Audio Fabrication< the guy knows his stuff. Quality is everything.
     

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