Gads Spark attack-decay

[Raymond C Drouillard]

On Tue, 19 May 1998 23:10:14 -0700 garfield at pilgrimhouse.com writes:

<snip>

>Well, me, I think the trick is KNOWING which cylinder is the bad guy. A
>pretty impossible trick, methinks, overall. Piezo knock pickups are
>placed on the case not so much nearest the known bad boy, as they are
>attempting to find a spot that's sorta "equidistant" acoustically, from
>all the cylinders, so no one cylinder has a louder say in who's
>knocking.

A modern ECU can tell which cylinder is knocking because it knows when it
is knocking.  The one that just received the spark is the one that is
knocking.  It'll then retard that one cylinder.

Ray Drouillard

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