My mechanic likes the JPI. Any specific feedback on them would be helpful.

We have flown with the EDM-700 since having our engine rebuilt (at the
same time we bought the plane, a '74 Cherokee Pathfinder) in 2002.
We've now used it for 500+ hours, and know it very well.

1. The engine monitor is irreplaceable in the diagnostic role. When we
are on the take-off roll, the co-pilot (my wife and are both pilots,
and we have some pretty rigorous CRM) calls out "6 good bars" --
meaning that we have all six cylinders firing, and that the bars are
straight across, meaning that they're all about the same temperature.
If they're not, we'll abort.

We invented this procedure after losing our #2 cylinder on takeoff from
Titusville, FL, back in '04. The JPI made diagnosing the problem
nearly instantaneous -- but it probably would have been noticeable
before rotation if we had used this procedure back then. As it worked
out, we flew the pattern on 5 cylinders, and landed without incident.

2. The add-on digital oil temperature is excellent, as opposed to the
very inaccurate, hard to read Piper gauge.

3. The "lean-find" feature is something you use about 10 times, and
then you forget about it.

4. The "shock-cooling alarm" (it blinks when your EGTs drop more than
50 degrees in a prescribed amount of time) is nice to raise awareness
of the problem. You can use the JPI to slowly retard your throttle on
descents, and keep your EGTs within a very narrow temperature range.
(The jury is still out on "shock cooling", IMHO -- but the engine is so
expensive, I pretend it really exists and fly accordingly, under the
"this can't hurt anything" rule of engine management)

We have not added the fuel flow option, as our plane came equipped with
the JPI FS-450 digital fuel flow meter.

It's a great tool, and I would not fly without it by choice anymore.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"