[Diy_efi] Knock Detection using GM ESC Module

[Bruce]

Learning how to read plugs is the only true answer.
J+S makes some serious K/S stuff.   It just looks for knock when it's likely
to be present not full time.  Too easy to sense noises that appear to be
detonation in a race engine.   An Acoustic detector is looking for noises,
ONLY.   If any NOISE is similiar to what it's looking for it will be
triggered.
Bruce


----- Original Message -----
From: "Ken Richardson" <krichar at ns.sympatico.ca>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 29, 2002 6:57 AM
Subject: [Diy_efi] Knock Detection using GM ESC Module


> We recently had one of our race engines fail due to a lean condition. It
> basically detonated itself to death, melted 4 pistons until one finally
let
> go. The engine ran fine on the dyno and in testing so we think it was a
fuel
> restriction that caused it. We couldn't find anything so we're going to
> richen the carb up and add some octane boost to the fuel to be on the safe
> side.
>
> I picked up a GM ESC module from an early 90's GMC truck, 5.7L. Our race
> engine is a 350cid GM smallblock bored 0.060 oversized. I'm going to use
the
> ESC module with a power transistor to drive a warning light on the dash of
> the car. I haven't experimented with this before, it looks like it should
> work. Lightly tapping on the block with a hammer flashes the light. Will
the
> ESC module/sensor consistently detect detonation at higher RPMs, in the
> range of 3800 to 5800rpm? This is the RPM range we run the engine. Will
the
> larger cylinder diameter throw the sensor tuning off enough that it won't
be
> reliable?
> We want to limit our chances of burning any more pistons. We got lucky
this
> time, no damage to the block, although the heads needed to be rebuilt due
to
> the aluminum buildup. It gets expensive not to mention working our buts
off
> to get ready for the next race.
> Opinions??
> Thanks
> Ken R.



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