Failures of Capacitors and diodes from over voltages applied??

[russwr]

In general, diodes and capacitors in circuits fail because of overheating. If ignition coil high volts is applied as in milliseconds pulses of 24kv, would the 1kv devices still function? There is no heat from high voltage wires. Needing suggestions for Isolation. (Not wanting high voltage diodes protection, as they require more power from the input battery because of high voltage drop losses, as they need a higher output volts on secondary of transformer. This Capacitor 70 circuit from 2008 uses no string diodes waste energy, and this circuit was reported as working by several others. y side of transformer.