On Fri, 11 Mar 2005 20:25:16 -0500, "Morgans"
wrote:


"mindenpilot" wrote

We do all kinds of little tricks like putting a notch in the crankshaft to
use as a phase reference.
Then we can determine at what point in the cycle an anomaly occurs, which
can lead to different diagnoses.

How does the notch help in telling the rotational position?

A little magnet and associated coil sees a difference in flux as the
slot goes by. This is a variable reluctance sensor.
Your auto engine may be timed from something like this, any more.

Brian W