I've had some luck reducing ignition noise on 2M in my MGB by putting a few
'clip-on' ferrites on the low tension side of the ignition circuit. (The
tachometer uses a current sense rather than a voltage sense, so the raw coil
current runs into the cockpit.)

Would ferrite also help on the spark plug wires? BTW, this is an old car
with points.

--
Bob D. ND9B

In the 'Olden Days' of my youth we installed 10K ohm snap on resistors to the
plugs on MGAs, MGBs, TR3s and my trusty TR-4., They also worked on family
sedans, pickup trucks, and station wagons.

I don't know if such devices are currently manufactured. But, the Autolite web
page still lists resistor plugs. A 5K series resistance will work wonders for
spark plug noise.

If you have a DC generator as opposed to an alternator you will need to bypass
the high current connection at the generator with something like a 1 uF coaxial
capacitor.

These two engine noise suppression techniques should cover 90% of your engine
noise issues in the older vehicles.

/s/ DD, W1MCE [HF mobile for almost 50 years beginning with a 1953 Studebaker,
followed by a Renault dauphine, followed by the trusted TR-4, followed by babies
and station wagons.......]

- - -

Bob D. wrote:
I've had some luck reducing ignition noise on 2M in my MGB by putting a few
'clip-on' ferrites on the low tension side of the ignition circuit. (The
tachometer uses a current sense rather than a voltage sense, so the raw coil
current runs into the cockpit.)

Would ferrite also help on the spark plug wires? BTW, this is an old car
with points.

There also used to be "resistance wire" ignition wiring, but IIRC, it
was pretty fragile.

"professorpaul" wrote in message
oups.com...
There also used to be "resistance wire" ignition wiring,
but IIRC, it
was pretty fragile.

There are probably resistor spark plugs available for
this car. They will significantly reduce ignition noise
although other remedies, such as ferrite beads, will also be
helpful.


--
---
Richard Knoppow
Los Angeles, CA, USA