Scope pics...

[David Cooley]

And if you look at the secondary waveform on a scope, it oscillates in the 
same polarity from 0 to say 15KV or whatever value it hits...
it never reverses it's polarity.
Look at what Ford does with their DIS cars... one bank of the engine gets 
plugs with a platinum tipped center electrode, the other bank gets plugs 
with a platinum pad on the ground electrode... Because the voltage/current 
flows in ONE DIRECTION thru the plugs.


At 06:29 PM 11/13/2000 -0500, you wrote:
>All of this talk about currents when the discussion is of a voltage wave
>form and not of a current wave form which is considerably different.
>Remember that a coil is an inductor and that the response of an inductor
>is to oppose the change in current through the inductor so that when the
>points are closed the current flows through the inductor creating the
>magnetic field of stored energy,  when the points open the inductor
>reverses it's voltage and amplifies it's voltage in an attempt to keep
>the current flowing in the same direction and at the same rate until the
>energy in the magnetic field is used up.  This inverted spike is
>precisely what is used in the ingnition coil although further amplified
>by the step up to the secondary coil.  These segments of the points
>being on or off and the different parts of the reaction are all A/C
>components that have frequency that readable by a tach, but the actual
>spark across the gap of the plug will work in the same direction each
>and every time.  Thus the current through the spark plug, which is only
>during spark, is always going in the same direction.
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