Knock sensors

[ptimmerm@mashtun.jpl.nasa.gov]

hers's what I have found out about knock sensors.

Bruce Bell pointed me to these guys.

J & S Electronics
13925 Parkway drive 
Garden Grove, CA 92643
(714) 534-6975

They make a universal closed loop knick sensor / ignition
retard system that works for 5 cylinder motors (and others).
He suggest using the GM saturn sensor, ait has about the right 
frequency.  You need to weld a 10.15 bold onto a metric stud to
mount this unit to the block.  You then connect it to the
control box via a harness that is probided.  It can provide 
up to 6 degrees of retard per ping, up to a max of 10 or 20 degrees.
The whole thing is $395.  There are two displays for this unit
as well.  the dual model for $140 has both a led bar graph of retard,
and an O2 sensor /mixture graph.  The knock only runs $90.

I feel this is a bit steep, but you've got somebody else doing
the engineering already to bolt on.  If some of you have an 
interest in going in for a group buy, at a discount let me know
and I can try to negotiate it.

paul timmerman