[Diy_efi] Knock Detection using GM ESC Module

[Jeremy Bertenshaw]

If you don't have any luck with it, http://www.autospeed.com 
have done some articles on knock detection, as well as 
some hardware projects for detection, it's a good site 
and well worth subscribing to, to get access to the 
non-free tech articles :-).

Another option that you might consider if you haven't
got one is an oxygen sensor display so you can monitor
lean conditions etc.
 
jeremyb.

> From: "Ken Richardson" <krichar at ns.sympatico.ca>
> Date: 2002/05/29 Wed PM 10:57:36 GMT+12:00
> To: <diy_efi at diy-efi.org>
> 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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