[Diy_efi] Ion Sensing project

[Garfield Willis]

On Thu, 4 Jul 2002 15:14:43 +0300 (EET DST), Ville Vartiovaara
<vvartiov at cc.hut.fi> wrote:

>But for ion sensing it's important that:
>- The spark decays fast (no multispark or similar)

In addition to the above, in your other recent post, you also remark
about the CDI systems being faster than the coil/inductive spark
systems. But you've said you have a conventional dizzy/coil arrangement.
How are these two facts reconciled?

It would seem your standard inductive IGN violates this 'fast decay'
criterion. Unless you're overtly terminating the HV earlier than just
letting the coil decay normally. Have you actually *measured* the decay
time till the IGN pulse is passed the threshold of obscuring the ion
current. I grant you, you have a spark gap in the dizzy to help you, but
unless you have a very lossy coil, your spark durations at the plug are
still going to be WAY longer than any CDI single-spark system.

Just how clear and unobstructed a window do you really think you have to
the post-ignition ionization period?

Gar


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