I've watched the output of the Mazda knock sensor on a 'scope under knocking
conditions with no filtration or signal processing. I don't have any records
of the frequencies or amplitudes of the signals, but I do recall that the
amplitude during knock was way higher than the background noise.

Jon Lauter
Rotary Power Marine Corporation

There are two kinds of knock sensors out there. The early so-called tuned
ones that responded to unique knock frequencies and the later broad band 
that rely on the computer to do the filtering. 
Do you know which one you had Jon.

Paul Lamar

The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org