First, make sure your spark plugs have an 'R' in their model number.
That means they are a resistor type spark plug that reduces radio
ignition noise without reducing spark output in a significant way.

For spark plug wires, make sure to avoid ANY ignition wiring sets that
brag about low resistance since that is, like on the spark plugs, needed
to suppress AM radio noise. Due to how wiring and Ohm's law works, the
resistance needed in ignition wiring and spark plugs to eliminate
ignition noise in an AM radio does not significantly reduce the spark
intensity. There is so little current flowing through ignition wiring
that even the normal high-resistance in ignition wiring does not
significantly reduce the voltage. And don't worry, that extra
resistance is PURPOSELY added to the wiring... it costs more to make it
that way than it would with lower resistance wiring.

So go with standard carbon-impregnated ignition wiring sets and avoid at
all costs any so-called "performance" ignition wiring set that talks
about its lower resistance even if it also says it has some lame
"spiral-wrap" technology to reduce noise.

Using standard resistance-type spark plugs and ignition wiring should
take care of your ignition noise in your AM radio.

Jerry

James Nipper wrote:
> I have a 1980 Jeep CJ-5, V-8 engine. I just use it at my vacation cabin.
>
> I have terrible ignition noise on the am radio. I have replaced the plugs,
> rotor, and distributor cap. I have not replaced the plug wires.
>
> There is a NAPA dealer in the nearby town. Does NAPA sell a basic good set
> of plug wires, that is effective in radio noise suppression??
>
> I know I can call NAPA and ask, but I prefer to get input from other persons
> that would have first-hand knowledge about this sort of thing.
>
> Thanks for any help !!
>
> --James--
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

First, make sure your spark plugs have an 'R' in their model number.
That means they are a resistor type spark plug that reduces radio
ignition noise without reducing spark output in a significant way.

For spark plug wires, make sure to avoid ANY ignition wiring sets that
brag about low resistance since that is, like on the spark plugs, needed
to suppress AM radio noise. Due to how wiring and Ohm's law works, the
resistance needed in ignition wiring and spark plugs to eliminate
ignition noise in an AM radio does not significantly reduce the spark
intensity. There is so little current flowing through ignition wiring
that even the normal high-resistance in ignition wiring does not
significantly reduce the voltage. And don't worry, that extra
resistance is PURPOSELY added to the wiring... it costs more to make it
that way than it would with lower resistance wiring.

So go with standard carbon-impregnated ignition wiring sets and avoid at
all costs any so-called "performance" ignition wiring set that talks
about its lower resistance even if it also says it has some lame
"spiral-wrap" technology to reduce noise.

Using standard resistance-type spark plugs and ignition wiring should
take care of your ignition noise in your AM radio.

Jerry

James Nipper wrote:
> I have a 1980 Jeep CJ-5, V-8 engine. I just use it at my vacation cabin.
>
> I have terrible ignition noise on the am radio. I have replaced the plugs,
> rotor, and distributor cap. I have not replaced the plug wires.
>
> There is a NAPA dealer in the nearby town. Does NAPA sell a basic good set
> of plug wires, that is effective in radio noise suppression??
>
> I know I can call NAPA and ask, but I prefer to get input from other persons
> that would have first-hand knowledge about this sort of thing.
>
> Thanks for any help !!
>
> --James--
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

First, make sure your spark plugs have an 'R' in their model number.
That means they are a resistor type spark plug that reduces radio
ignition noise without reducing spark output in a significant way.

For spark plug wires, make sure to avoid ANY ignition wiring sets that
brag about low resistance since that is, like on the spark plugs, needed
to suppress AM radio noise. Due to how wiring and Ohm's law works, the
resistance needed in ignition wiring and spark plugs to eliminate
ignition noise in an AM radio does not significantly reduce the spark
intensity. There is so little current flowing through ignition wiring
that even the normal high-resistance in ignition wiring does not
significantly reduce the voltage. And don't worry, that extra
resistance is PURPOSELY added to the wiring... it costs more to make it
that way than it would with lower resistance wiring.

So go with standard carbon-impregnated ignition wiring sets and avoid at
all costs any so-called "performance" ignition wiring set that talks
about its lower resistance even if it also says it has some lame
"spiral-wrap" technology to reduce noise.

Using standard resistance-type spark plugs and ignition wiring should
take care of your ignition noise in your AM radio.

Jerry

James Nipper wrote:
> I have a 1980 Jeep CJ-5, V-8 engine. I just use it at my vacation cabin.
>
> I have terrible ignition noise on the am radio. I have replaced the plugs,
> rotor, and distributor cap. I have not replaced the plug wires.
>
> There is a NAPA dealer in the nearby town. Does NAPA sell a basic good set
> of plug wires, that is effective in radio noise suppression??
>
> I know I can call NAPA and ask, but I prefer to get input from other persons
> that would have first-hand knowledge about this sort of thing.
>
> Thanks for any help !!
>
> --James--
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

I have always had excellent AM radio performance with solid metal core
wire with resistor plugs and the proper coil resistor value. What
resistance does is lowers the Q of the tuned circuit formed by the
plug, wire, and cap, which is a tuned LC circuit at _some_ frequency.

This makes the circuit lossier for RF "floating around".

You will be interested to know the late Dave Blanton of Javelin
Aircraft advocated straight metal plug wire for his Javelin Ford
conversions , as in his 175 Skylark testbed. The ADF worked fine for
listening to Royals and Broncos games just fine. So did the VHF AM nav
and com radios.

 

I have always had excellent AM radio performance with solid metal core
wire with resistor plugs and the proper coil resistor value. What
resistance does is lowers the Q of the tuned circuit formed by the
plug, wire, and cap, which is a tuned LC circuit at _some_ frequency.

This makes the circuit lossier for RF "floating around".

You will be interested to know the late Dave Blanton of Javelin
Aircraft advocated straight metal plug wire for his Javelin Ford
conversions , as in his 175 Skylark testbed. The ADF worked fine for
listening to Royals and Broncos games just fine. So did the VHF AM nav
and com radios.

 

I have always had excellent AM radio performance with solid metal core
wire with resistor plugs and the proper coil resistor value. What
resistance does is lowers the Q of the tuned circuit formed by the
plug, wire, and cap, which is a tuned LC circuit at _some_ frequency.

This makes the circuit lossier for RF "floating around".

You will be interested to know the late Dave Blanton of Javelin
Aircraft advocated straight metal plug wire for his Javelin Ford
conversions , as in his 175 Skylark testbed. The ADF worked fine for
listening to Royals and Broncos games just fine. So did the VHF AM nav
and com radios.

 

I have always had excellent AM radio performance with solid metal core
wire with resistor plugs and the proper coil resistor value. What
resistance does is lowers the Q of the tuned circuit formed by the
plug, wire, and cap, which is a tuned LC circuit at _some_ frequency.

This makes the circuit lossier for RF "floating around".

You will be interested to know the late Dave Blanton of Javelin
Aircraft advocated straight metal plug wire for his Javelin Ford
conversions , as in his 175 Skylark testbed. The ADF worked fine for
listening to Royals and Broncos games just fine. So did the VHF AM nav
and com radios.

 

Thanks for these very nice replies. How would one tell if the noise is the
ignition, or the alternator???

It does vary of course with engine speed.

--James--

 

Thanks for these very nice replies. How would one tell if the noise is the
ignition, or the alternator???

It does vary of course with engine speed.

--James--

 

Thanks for these very nice replies. How would one tell if the noise is the
ignition, or the alternator???

It does vary of course with engine speed.

--James--