Knock sensor on dyno

[Bill Sundahl]

Take a look at
http://home.netcom.com/~bsundahl/knock/sound/KnockSounds.htm

This shows some of the work that I have done on recording and analyzing
the signal off of an Eagle Talon knock sensor.  The sensor does not
seem to be "tuned" that I can tell, it's just a wide band microphone.
I am assuming that the GM sensors are very similar.

The Talon uses a fancy filter circuit inside the ECU to detect knock, 
but I have never been able to figure out exactly what it looks for 
in the signal.

-Bill