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Capacitance Discharge Ignition System

  1. Oct 6, 2006 #1
    Dear friends,

    I am building a CDI system to ignite fuel mixtures in a pressure chamber for flame speed measurements.
    I need a capacitor of about 5 nF, but it should hold up to 10 kV.
    Any suggestions on where I can get those. I also need a diode (rectifier) for 10 kV. Also I need high voltage relays.


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    Last edited: Oct 6, 2006
  2. jcsd
  3. Oct 7, 2006 #2


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    Where are you getting you component values from?

    Normal CDI, the spark coil generates the HV (10Kv to 30Kv).
    With a standard spark coil 100v to 350v on C of 1uf should give about that output range.
    So your diodes and relays only have to rated for about 600v.
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