03-12-2002, 07:57 AM
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CC Member
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
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Not Ranked
MSD6A & radio noise problem
While deglitching the rich running Holley and CR muffler swapout, I replaced the Accel 300+ CD ignition & FMS plug wires with an MSD6A & MSD low resistance plug wires. (Just on the offchance that part of the plug fouling might be caused by the ignition).
Turns out that when I replaced the mufflers, I was able to tune the Holley. (Opened the secondary butterflies a little, colsed the primaries enough to get out of the primary transition slot, and stopped fouling plugs at idle). Accel ignition was probably OK.
When I installed the Accel ignition box, I installed a radio noise filter at the radio power lead along with it. No radio or tape deck noise. The MSD has a distinct (and annoying) Bzzzzz, even with the volume turned down, and increases in pitch as the RPM goes up. Using MSD distributor with mag pickup, Accel coil.
Any ideas on what might be causing this, and how to cure it? Otherwise, I have to put up with the noise, or put the Accel CD box back in.
I know, I know; why do I want a sterio in a Cobra at all??? I like my Oldies tapes and stations sometimes! And I like it loud! '50's & '60's stuff. Chuck Berry, Little Richard, Bill Haley & the Comets, yeah that stuff.
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