Al Gietzen wrote:

If you're serious about looking into knock sensing, and incorporating
compensation into an engine controller; you may want to consider a
state-of-the-art approach that has clear advantages over audio detection.
See SAE publication number 950004, "Ion-Gap Sense in Misfire Detection,
Knock and Engine Control".  Senses preignition conditions by applying a
voltage to the plug gap.

Al Gietzen

I think Saab uses that. Thanks for the reference Al.

Paul Lamar

marc wiese wrote:

Or even a pressure sensor that senses the peaking of the pressure wave just
before damaging knock starts. (Gami is perfecting a system like this as
part of the new electronic ign/fi/ dream stuff that is supposed to get
100ll engines to work on the lower octance stuff).
Marc Wiese

I think I mentioned this before. Monitor the intake manifold air temp. Knock
is  strong function of this temp.

Paul Lamar

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