[Diy_efi] Ion Sensing project

[Bruce]

----- Original Message -----
From: "Ville Vartiovaara" <vvartiov at cc.hut.fi>
> As far as I remember, the CDI is being discussed here only to get some
> voltage level to compare to. :) Wheter it is CDI or not is not a problem
> as long as the spark is done until TDC.. Shouldn't be a problem. ;)

My error, I thought the discussion was in fact using a CDI ignition for a
spark course.
One point to consider, is on a high boost engine, you might only be dealing
with 17d of advance, which isn't going to leave much time for spark event.

> And CDI has shorter decay time than a plain coil, so..
> And why shouldn't ion sensing be used to detect misfire and launch an
> additional spark in such a case..?

If your going to be sensing, things at around/until, 12 ATDC what real good
is another spark at 14d ATDC going to do?.    Isn't this just getting to be
feature creep?.

> The problem with CDI is usually the ringing on the HV side after the
> spark, which may corrupt the ion sensing process.. But this is just a
> misfeature of the cap and coil and bad design..

Can you give a simple explaination why a CDI would have more ringing then a
conventional setup?.   It would seem to me, that with a faster rise time,
there would also be a faster decay.
Bruce




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