[Diy_efi] Crank sensor for knock detection?

[Alexei Pavlov]

puffnsmoke at cox.net wrote:
> 
> Ok, too much sour mash, the question was supposed to be was it possible
> to use the crank sensor to detect detonation in an engine...
> 
> Yeah knock sensor for knock detection is easy, lol.  What about
> analyzing the crank sensor waveform in real time to detect detonation.
> Is it possible, and is it done on production engines that don't come
> with knock sensors?

Yet another 'It's not possible'. Because there are 2 types of
knocks: pre (hot spots) and post (compression) ignitions. They lead
to very different torque changes. You could not distinguish torque
changes due to knocks from that due to mecanical/route disturbances
as they could all give the same torque change.

When there are no knock sensors there are knocks (old carb turbo
engines).

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