[Diy_efi] Knock Detection using GM ESC Module

[Barry Tisdale]

MSD makes a knock detector w/ adjustable sensitivity, comes w/ its own 
sensor; flashing LED dash top unit.  Worked well for me.

Barry

At 07:57 AM 5/29/02 -0300, you wrote:
>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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