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Hi Dave,
Bacially, the inductive stock ignition uses only the coil for generating high voltage. It uses only the induction/transformer effect of the coil for this and is triggered by the magnetic pickup in the distributor. A CD ignition uses an internal oscillator to generate and to charge capacitors up with much higher voltage than the normal 12v. When triggered the capacitor discharge current through the coil makes the induction/transformer process of the coil start with a higher voltage. This gives much higher power and the rise time is better because the oscillator is higher frequency than the motor can run rpms. It's best to have a coil that is designed to handle the high voltage discharge,
because you don't want to saturate the stock coil or overheat it from higher input voltage. From what I've learned about CD the input to the coil is usually around 450 volts.
The other issue I know about with MSD units is they don't source a powerful enough rpm signal to drive the k-jetronic fuel pump relay. If you aren't using k-jet then you are fine but if you need to supply that fuel pump relay you'll have to add an amplifier or a dummy coil to help amplify the signal. Happy rolling!
Dave 82 242ti 279k mi.
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