breakerless ignition and radio noise
I installed the breakerless ignition unit breakerless.com in my original (but new) C2 small block distributor. I now get spark noise in my FM radio, is this normal?
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Did you also change the plug wires to the appropriate resistance?...:toetap:
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A properly designed electronic ignition will turn the coil off a lot quicker, increasing the chances for more high frequency noise in the wiring harness. In addition to the question about what plug wires you have, do you have a capacitor/condenser on the C+ terminal of the coil?
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The EMI from a spark is the same whether points are involved or not.
It's likely you just have a stronger spark now. You can use filter caps, shielding, or toroid chokes to try to reduce the noise. |
Originally Posted by SDVette
(Post 1593602975)
The EMI from a spark is the same whether points are involved or not.
It's likely you just have a stronger spark now. You can use filter caps, shielding, or toroid chokes to try to reduce the noise. |
Originally Posted by 66jack
(Post 1593601913)
Did you also change the plug wires to the appropriate resistance?...:toetap:
Seems the 'standard' carbon core wires are higher resistance ( so weaker spark) but better RFI, and deteriorate sooner. Anyone knows where to buy plug wires with spiral core for a 327 with standard distributor, supposed to be a good compromise for spark and RFI? |
I run the Breakerless-SE and don't have any noise at all with stock radio...
Its prob the plug wires....could be the alternator.....is it constant hissing or a whining increasing with RPM..? |
Originally Posted by Frankie the Fink
(Post 1594066622)
I run the Breakerless-SE and don't have any noise at all with stock radio...
Its prob the plug wires....could be the alternator.....is it constant hissing or a whining increasing with RPM..? |
alexandervdr,
You did not say if you have a capacitor/condenser on the C+ terminal of the coil? |
Originally Posted by Yellow6t7
(Post 1594071532)
alexandervdr,
You did not say if you have a capacitor/condenser on the C+ terminal of the coil? |
Originally Posted by alexandervdr
(Post 1594072202)
No, Is there one in the original C2?
See LIC catalog 53-4A alexandervdr when you get this issue resolved please post how you fixed it. It will be helpful to others. |
Originally Posted by Yellow6t7
(Post 1594072554)
Yes,
See LIC catalog 53-4A alexandervdr when you get this issue resolved please post how you fixed it. It will be helpful to others. Earlier today I ordered high resistance spark plug wires, may reduce RFI (put weaken spark too...). It may take weeks before they get here, so I'll love to see the capacitor trick works out tomorrow:thumbs: |
I did put the condensor and unfortunately it does not make too much of a difference. Again, remember I have 'performance' spark plug cables with very low resistance and probably bad RFI shielding. I'll know when I get my 'standard' cables ordered some days ago.
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You could try a generic 12V L-C power line filter and that my reduce the noise enough to satisfy you, or maybe not... Hard to say until you try it...they are only a few bucks and you could still leave it in even if you have to go the plug wire route...
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Originally Posted by Frankie the Fink
(Post 1594083812)
You could try a generic 12V L-C power line filter and that my reduce the noise enough to satisfy you, or maybe not... Hard to say until you try it...they are only a few bucks and you could still leave it in even if you have to go the plug wire route...
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Originally Posted by alexandervdr
(Post 1594083856)
I tried that already, did not work. The point is that I get very clean sound when I (bluetooth) stream music from my iPhone. It's only in the 'radio' position I have the problem which indicates the noise is going through the antenne rather than through the power lines.:thumbs:
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Originally Posted by 69427
(Post 1593602389)
A properly designed electronic ignition will turn the coil off a lot quicker, increasing the chances for more high frequency noise in the wiring harness.
There are two phenomena in play: 1. The more rapid rise time of the current when the coil is switched will introduce noise in higher frequencies (such as used by the FM broadcast band). 2. Also, a property of switched inductance, such as that of a coil, is that the Voltage transients are just larger when current through the inductor switches more rapidly. Likely solution: slow down the rate of change of current through the coil. How? Well, one way would be to get rid of the solid state switching device. Jim |
Originally Posted by jim lockwood
(Post 1594084633)
...
Likely solution: slow down the rate of change of current through the coil. How? Well, one way would be to get rid of the solid state switching device. Jim |
I have had a breakerless Pertronix in my 62 Corvette for 20+ years and have no radio noise with my original AM radio, no FM back then.
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I've had a Pertronix in about 8 cars over the years and now run the Breakerless SE system in my '63 and never a hint of noise....
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