Dual knock sensors with CISIII?

[Jim Green]

--- Marc Swanson <mswanson at mswanson.com> wrote:
> > So I've got the two knock sensors sitting in front
> of
> > me from my MC-2, I'd like to rig up a dual knock
> > sensor CISIII ignition.  Any one know if that's
> > possible using the 90q ignition with the MC-2
> sensors?
>
>
> They certainly look very different and attach to the
> block differently.  The
> MC-2 (assuming the sensors are the same as MC-1)
> screw into the block while
> the CIS III sensors attach with a bolt through the
> sensor body.  No doubt
> they produce different waveforms.  I bench tested a
> CISIII sensor in an EE
> lab on campus at UNH and if you get the thing to
> resonate it produce a nice
> little rippled wave on an o-scope.  The shape of the
> wave is very important
> as the ECU has to interperet what is knock and what
> is normal engine noise..
> thus I can bet that their resonant frequencies are
> quite different since
> their shape is very different.
>
> As far as using dual sensors on CISIII I'm not
> sure... you'd have to splice
> the two sensors together and that alone has the
> potential to create some
> unwanted noise in the circuit.  That coupled with
> the fact that the ECU is
> not expecting to encounter 2 signal sources on the
> same line....
>
> Later
>
> -Marc-
> 87 4ktq
> 88 90q

That's about what I thought, but you never know.
Thanks again,


=====
Jim Green
'89 90tq EFI
http://www.geocities.com/jeg1976/car_home.html

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