Capacitor discharge Ignition

[Bruce Plecan]

Sport Compact Car or one of the other mags., had a write upp about all the
current ign systems, and they are all running 480-520v on the primary....

Dick Smith Electronics in Australia sells a Kit

BTW, does anyone have the component layout?.

FWIW
Bruce


> Where did you get the CDI kit?  Wouldn't the supplier have a replacement
or
> are you rolling your own?   I can tell you from painful experience that
it's
> not quite as easy as it looks.  The core has to be capable of handling the
> magnetic field generated by the current through the coil.  If the core
> saturates the inductance vanishes.  Most CDI ignitions use a step up
> transformer technique that runs a switch on the 12 volt size at anywhere
> from 5KHz up to 50KHz.  The higher the frequency,  the more efficient and
> smaller the core within limits.
>
> There are several core manufacturers that have formulas for determining
core
> size and permeability.  You'll need to know the frequency you're running
and
> the current you are planning on putting through the primary side.  The
> secondary is usually set to create about 300V to charge up a 1.5uF to
3.0uF
> capacitor.    How fast you need to charge it is determined by the number
of
> cylinders and the maximum RPM.  It's like the charger for a photo-flash
but
> those take 10 to 15 seconds to fully charge the capacitor.
>
> Regards,
>
> John Dammeyer
>
>
> ----- Original Message -----
> From: "Warwick Anderson" <racingfit at goconnect.net>
> To: <diy_efi at diy-efi.org>
> Sent: Sunday, December 31, 2000 4:04 PM
> Subject: Capacitor discharge Ignition
>
>
> > Help!
> > I was building a programable CDI kit  but the ferrite cores for the
> > transformer kinda broke into little bits.
> > Iv tried to find a replacement, but cant. Can I replace  something for
it?
> > shaped out of iron or steel maybe?
> > could I drag a transformer from something else the same size, pull it
> apart
> > and rewind it to suit?
> > thanx heaps
> > happy new year to all
> >
> >
>
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