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Old 09-24-2003, 08:02 PM   #1
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CDI ignition

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Has anyone ever tried to make a CDI ignition before
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Old 11-25-2003, 12:37 PM   #2
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CDI ignition

I've messed around with such stuff. Tough to make it small and light enough for a model.
The principle is to charge a capacitor up to high voltage (150-300 volts), and dump it into the ignition coil each time you want it to fire (6000 RPM = 100 times per second), usually with an SCR triggered by conventional points or an electonic pickup.
Thus extra parts over a standard inductive ignition system:
Extra oscillator circuit, step-up transformer, and capacitor.
And you still need an ignition coil.
Advantage would be hotter spark at low speeds (easier starting).
I've seen a pretty tiny ignition coil on a Honda 50cc dirt bike, should do the job.
It may be just as good to try a battery ignition system (inductive, instead of CDI), can use an electronic circuit to trigger it also.
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