Knock sensors

[James Weiler]

On Fri, 29 Aug 1997, Frank F Parker wrote:

>  I have done what you thought about with an equalizer and knock sensor
> and it was not much better than just listening to bare sensor.
> Todd and the others are correct-simple analog filters just do not
> cut it- that is why the early knock systems were so sensitive to
> location etc. The J&S Electronics unit uses DSP filtering so you are able
> to filter freq that are separate but close together- impossible even
> with multiple pole analog filters. Best the J&S has a 0-1.25 volt
> monitor out so you can drive a LM3914 for a retard display. I also ran
> it to a datalogger and took data at 50/sec along with various pressures
> and temps on a recent turbo project car.
> 
> This is one of those cases where there is not a cheap way to monitor
> and control knock- gotta pay your bucks!- Even then location of sensor
> is important to the best performance.
> 
Probably the best piece of informed advice I've seen on the list in a while.
Thanks.  Anybody got a 1-800 number for J&S?  Web page?

In the back of the Probst book there is a vendor list.  Some company 
starting with an "A" sells a knock sensor for any EEC-IV.  Always meant 
to drop them a line and my Probst book is burried somewhere.  Anybody 
know anything about these guys?

later
jw