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breakerless ignition and radio noise

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Old 02-13-2017, 07:01 PM   #21
69427
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Quote:
Originally Posted by alexandervdr View Post
If that means going back to breaker points, I am probably not going to try that (please don't turn this into a points versus electronics thread! Both sides are right, but one can only go one side...)
The capacitor on the C+ terminal is there to reduce/prevent noise being induced into the vehicle harness and into the radio power supply. Once you have the cap in place then you need to address the plug wire issue. Low resistance/reactance plug wires allow a high current spike to occur once the plug arcs over. This high current pulse radiates everywhere, both into the wiring harness and into the antenna. If you can slow down/reduce the plug current spike it should help reduce the noise in the radio. Let us know how things are when you change the plug wires.
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Old 02-13-2017, 11:48 PM   #22
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I am surprised nobody asked if you were running a stock or aftermarket (newer) radio, some of which require additional wiring and grounds.
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Old 02-14-2017, 08:38 AM   #23
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The aftermarket radios I have run have a big bolt that goes into the PS side mount point and thoroughly ground the case....the AAR repro for instance; I guess there are others that might float in the mounting and require a separate ground... Its also possible the radio has a defect as the Bluetooth works whereas broadcast stations do not (without noise)...

This last factor is a key clue - it may preclude noise introduced into the power line...

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Old 02-14-2017, 09:31 AM   #24
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Its also possible the radio has a defect as the Bluetooth works whereas broadcast stations do not (without noise)...

This last factor is a key clue - it may preclude noise introduced into the power line...
That's not quite a fair comparison. Bluetooth thingys operate in the 2.4GHz range while FM broadcast is waaaaay down there at 0.1 GHz. It's unlikely that any noise source, such as ignition, could generate any noise energy up at 2.4GHz.

Jim
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Old 02-14-2017, 09:38 AM   #25
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That's not quite a fair comparison. Bluetooth thingys operate in the 2.4GHz range while FM broadcast is waaaaay down there at 0.1 GHz. It's unlikely that any noise source, such as ignition, could generate any noise energy up at 2.4GHz.

Jim
That is true.

Its easy enough to tell....if the radio has an AUX or pin jack just play some tunes through that for a bit and see if the whine is there

Frankly, I could have changed the plug wires in the time its taken to produce this thread...

To the OP: I wouldn't worry two nits about resistance plug wires creating "weak" spark....its a non-issue for about 98% of our cars running the streets...

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Old 02-14-2017, 12:25 PM   #26
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Quote:
Originally Posted by jim lockwood View Post
That's not quite a fair comparison. Bluetooth thingys operate in the 2.4GHz range while FM broadcast is waaaaay down there at 0.1 GHz. It's unlikely that any noise source, such as ignition, could generate any noise energy up at 2.4GHz.

Jim
And I just thought about something else which would make Bluetooth thingys immune to ignition noise...... in all probability they communicate digitally which is about as noise-immune as you can get.

AM and FM broadcast both use analog technology, which is inherently more susceptible to radiated noise.

Jim
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Old 02-14-2017, 02:27 PM   #27
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Quote:
Originally Posted by alexandervdr View Post
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?
All these little things.....lets see the car....some video of it moving.....I think it is all made up.......lol......Ingrid , take some pictures while he is out.......

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Old 02-14-2017, 04:00 PM   #28
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all the comments make sense, I am now waiting for the higher resistance spark plug cables to cross the ocean (and the customs...)
That may take days or weeks, depending on the temper and mood of the 'red tape' .

As soon as I have tested them , I will let you know my findings

by the way: did I tell already that I installed the distributor top ignition shield , did not make any difference.
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Old 02-15-2017, 04:50 PM   #29
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Still trying to figure out how the OP is having noise trouble with FM (he didn't say whether AM was affected). FM is essentially immune to most electrical noise from sources in the car like plug firing and power switching. All those noise suppression capacitors are for AM, which will pick up any amplitude-change electrical noise that has frequency components in the bandwidth of the 455 KHz intermediate frequency amplifier. Unshielded graphite core plug wires usually don't have any effect on FM. A strong AM broadcast signal will usually override noise from unshielded graphite core plug wires.

The OP also didn't mention what kind of "high performance" plug wires he got from Zip. All I could find in their on line catalog were Pertronix wires, which are good ones for noise suppression - graphite center core with spiral wound resistance (nickel chrome or monel) wire covering the graphite. These wires generate less radio noise than uncovered graphite core wires because of the spiral wind of the resistance wire. The field generated by spiral core wires runs along the length of the wire, rather than perpendicular to the length of the wire (the same for graphite core or copper solid core wires).

Something else is going on beside the plug wires and breakerless ignition.
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Old 02-15-2017, 05:36 PM   #30
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Quote:
Originally Posted by Avispa View Post
...
The OP also didn't mention what kind of "high performance" plug wires he got from Zip. ....
what I got was "57-74 Performance Spark Plug Wire Set" from ZIP
Item #: M-3962
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Old 02-16-2017, 02:47 PM   #31
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Alexander, I just checked the wire set you mentioned. They're 250 ohms/foot. I'm running Bosch spiral core wires (50 ohms/foot stuffed in correct BBC braided wire shields). I'm also running a mallory unilite module as a trigger and an old MSD 6A analog box to jolt the coil. NO noise on FM or AM. You've got a radio problem. Your ignition mods just don't create enough RFI to put noise in a properly working original Delco radio with factory ignition shielding. Especially on FM.

Last edited by Avispa; 02-16-2017 at 02:48 PM.
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Old 02-16-2017, 05:46 PM   #32
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Originally Posted by Avispa View Post
Alexander, I just checked the wire set you mentioned. They're 250 ohms/foot. I'm running Bosch spiral core wires (50 ohms/foot stuffed in correct BBC braided wire shields). I'm also running a mallory unilite module as a trigger and an old MSD 6A analog box to jolt the coil. NO noise on FM or AM. You've got a radio problem. Your ignition mods just don't create enough RFI to put noise in a properly working original Delco radio with factory ignition shielding. Especially on FM.
Thanks for this detailed info. The braided part of your set-up may have an impact? Note that I have a modern Pioneer in there. Thats' the one that 's having the noise problem.
Where did you get the 250 ohms/foot info of the wires I bought? It's not on the ZIP site.
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Old 02-16-2017, 06:58 PM   #33
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Maybe the alternator/regulator is inducing some noise. Could pull the belt and test real quick.
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Old 02-16-2017, 07:33 PM   #34
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Quote:
Originally Posted by alexandervdr View Post
Thanks for this detailed info. The braided part of your set-up may have an impact? Note that I have a modern Pioneer in there. Thats' the one that 's having the noise problem.
Where did you get the 250 ohms/foot info of the wires I bought? It's not on the ZIP site.
it's on their mobile site at

http://www.zip-corvette.com/57-74-performance-spark-plug-wire-set.html

Last edited by Avispa; 02-16-2017 at 07:34 PM.
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