DIY_EFI Digest V5 #14

[Gary Derian]

MAF or map will work fine on the dyno but you need a large damping volume
between it and the engine.  A knock sensor is just a piezoelectric
microphone, you can mount it anywhere.  You will have to do some trial and
error to see what works.

Gary Derian <gderian at oh.verio.com>

> I am currently building a eddy current dynamometer for testing small
engines
> up to 70 ft lbs of torque. I am working on the instrumentation now and I
was
> reading the archive and started thinking about knock sensing. I already
have
> a digital tach, torque and 10 channel thermocouple thermometer in the
works.
> I was wondering if I could add a knock sensor to my list also? What
> specifically would I need to use a sensor ie power and how do I read it?
I'd
> like to use a sensor out of the junkyard to keep costs down so any ideas
of
> which one would suit me the best (partial to GM parts)? Can I put the
sensor
> in some type of holder then bolt it to the block for testing? Another idea
I
> have is to read intake air, not sure whether Mass air sensor will work due
> to stand off fuel (might make a big flame), or a MAP sensor maybe inside
> some type of velocity stack? Thanks in advance for any and all ideas! This
> list is a wealth of knowledge, anyone wanting to see my ongoing dyno build
> stop by my homepage at http://www.geocities.com/brucepts/pts.htm
>
> Bruce
>
>             There are those that have, and those that will . . .