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post #1 of (permalink) Old 06-06-2000, 05:42 PM
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MSD = Radio Whine please help

I have an MSD on my small block Mopar. It is super for performance, But, I have a constant high-pitched whine from the stereo. I am also using MSD wires. I have done my best to insure that everything MSD, Stereo, Amp are all grounded yet the noise persists. I have also installed a "static eliminator" with no change. Any assistance or suggestions would be appreciated.

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post #2 of (permalink) Old 06-06-2000, 06:17 PM
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Re: MSD = Radio Whine please help


I pulled this from NGK's web site and I hope it helps:

2. What is RFI?

Radio Frequency Interference (RFI) or electrical
"noise" is caused by ignition systems, alternators,
wiper motors, etc., but the ignition system causes the
strongest "noises" and they include a wide range of
frequencies. This noise can cause interference with
the operation of radios, electronic components, fuel
injection systems, depth finders, and other sensitive
electronic equipment. Resistor plugs, wires and
spark plug caps are used as a RFI suppression
system to reduce this noise.

http://www.ngksparkplugs.com/techinfo/

post #3 of (permalink) Old 06-06-2000, 06:32 PM
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Re: MSD = Radio Whine please help

Electrical noise is getting coupled into the power and ground circuit that feeds the amp, or possibly the stereo as well. It could be cause be a bunch of different things. Sometimes its the circuitry in the amp not being robust enough to provide clean power to itself when there is noise on the power or ground. Cheaper amps or EQs like the Jeson ones you can get at Wal-wart are notorious for having whines and hums from engine noise. I've personally had limited success with those static eliminators which are probably just some transformers and low pass filters. It seems like sometimes its the stock wiring that causes problems, and you can get around that by running your own circuits. If nobody else on here has better advice on your specifc setup, then here are somethings to try. Run your power right from the battery, both positive and negative to the amp and see if that helps. Twist the wires together as you run them and keep them as far away from the engine as possible. Stick your noise eliminator thing right before the amp. See what happens. You can do the same thign for the head unit as well. Oh yeah, be sure to put in your own fuses if you tap off the battery terminals like this.
Good luck


Mike
Tucson, Arizona
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post #4 of (permalink) Old 06-06-2000, 07:07 PM
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Re: MSD = Radio Whine please help

you hit it on that one van.. run seperate power and ground for all you electronic devices that deal with frequencies.. ie.. radio, amp, cb.. those noise eliminating thingings... dont work worth crap.. they are just a filter.. so it still lets noise thru.. just less of it.. you best bet is with the seperate power and ground..

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post #5 of (permalink) Old 06-06-2000, 08:42 PM
 
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Re: MSD = Radio Whine please help

MSD tells you right up front that you need to run the heavy red wire and the heavy black wire directly to the battery.
You might also install the MSD capacitor in the power feed line, and use a 'Condenser' on the ignition coil.

Generally, when people have the complaint you have, it turns out to be what we just covered.

Let us know what happens.

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post #6 of (permalink) Old 06-06-2000, 08:49 PM
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Re: MSD = Radio Whine please help

Just wanted to add this site http://users.erols.com/achassel/noise.html.

post #7 of (permalink) Old 06-06-2000, 09:52 PM
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Re: MSD = Radio Whine please help


I forgot to mention that my Corvette has a cover over the distributer cap and it is lined with a metal foil... for what it's worth.

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