Knock Sensor on Dyno

[Ade + Lamb Chop]

At 05:00 11/01/00 -0500, you wrote:
>> 
>> 	Knock Sensor on Dyno
>> 
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>> 
>> I am currently building a eddy current dynamometer for testing small
engines
>> up to 70 ft lbs of torque. I am working on the instrumentation now and I
was
>> reading the archive and started thinking about knock sensing.
>
>> like to use a sensor out of the junkyard to keep costs down so any ideas of
>> which one would suit me the best (partial to GM parts)?
>
>The one problem that comes to mind if you were using the GM knock sensors
>is the sonic qualities of knocking in your small engine. From what I've
>read, the knock sensor is tuned to specifically hear+amplify the
>characteristic knock sound for that bore diameter, and block. GM has had
>several different knock sensors, and even had a different one for the LT1
>and LT4, even though they have the same dimensions (LT4 was supposedly a
>little noisier). If you have the same bore, then I guess the knock would
>sound similar.

If it was me I would just plant a microphone somewhere on the block then
use software to sort out what is and what isn't just like humans do....
Much easier to do than tuning sensors... the amount you pay for Hi-fi
Microphones/speakers is testament to this.

Ade