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Re: Scope pics...
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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