Hi David,
I don't believe that simply using electronic ignition causes higher voltage.
The electronic ignition would be able to deliver higher voltage if needed, but
doesn't do this in any event.
With every ignition you have in your engine there's so much voltage generated
as just needed that the spark jumps between the electrodes of the spark plug
(or anywhere on the way to the spark plug should resistance be lower at that
point). Electronic ignition (and high voltage coils) can generate a lot more
voltage in special situations (e. g. high compression engine), so that the
spark can jump between the electrodes even when the resistance is getting
higher.
Imagine a garden hose whose opening is closed partially. Water will come out
with a higher pressure than when the opening is not restricted. You can
compare the blockage of the opening with electrical resistance and the
pressure of the water with the voltage.
My guess about rotor failures is, either you've been lucky obtaining good
rotors in the past or, more likely, you as British car specialists install the
whole ignition system as it should be installed.
Please find attached my replies in your survey.
Kind regards
Eric
David Nock wrote:
I am trying to get some info on all these rotors that you all are
having problems for a future article.
1. Which rotor are you using that failed??___none________
2. What are you using for a coil? __Pertronix High Voltage 40kV__
3. What distributor cap brand? ___Bosch____
4. What plug wires
Carbon____X_______ Steel core____________
5. What style ignition
Points______________ Electronic_____X_______
I have a feeling that a lot of these rotor failures are caused by the
higher voltage when using an electronic ignition. Since we rarley
install electronic ignition and we rarely have a rotor failure here
in the shop.
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