[Diy_efi] Knock Detection using GM ESC Module

[Programmer]

"melted pistons" or broke off ring lands ? Detonation looks different than
running lean. Which distributor are you running ? What compression, cam and
fuel choices ?

Lyndon

----- Original Message -----
From: "Ken Richardson" <krichar at ns.sympatico.ca>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 29, 2002 4:57 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.
>
>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi
>



_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi