[Land-speed] Knock sensor placement on flathead!

[Greg Meyers]

A close friend IS a PhD physicist, and will be helping  me!
Thanks for the URL !
Greg


On 6/2/09 7:42 PM, "Kirkwood" <saltfever at comcast.net> wrote:

> Greg: Interesting idea and thanks for the posting.
> 
> You have correctly identified the real issue and you have a much better
> grasp on this than I do. My $00.02 is only the logic of your effort. Knock
> sensors are seriously problematic in that they report all ''noise''. Noise
> being defined as ANY signal other than the PRECISE SIGNATURE you are looking
> for. Because of this you will spend copious amounts of time trying different
> locations or positions, and hair-pulling sessions trying mechanical
> isolation or dampening of extraneous signals. Why bother? I would just
> assume there is noise in the system and go into partnership with a PhD who
> understands Fast Fourier Transform (FFT) signal processing. Seriously, a
> smart software packages (as you mentioned) that is industrial strength with
> robust signal processing is more practical. You can chase mechanical issues
> forever. Just accept them and filter them out.  Put a copper strap
> longitudinally along each head and use two sensors (one on each side of the
> engine). Filter the noisy data, looking for the exact signature. There is a
> wealth of information on detonation signatures, one being Heywood pages
> 450-465. The problem with OEM sensors is that they don't have the computing
> horsepower to be extremely sophisticated. With your experiment it takes
> little effort or cost to improve on the OEM stuff by orders of magnitude.
> 
> http://www.dspguide.com/ch12.htm
> 
>  
> 
> Mayf: Thanks for the rule book point-out that brought a subsequent
> clarification. 
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