J.P. Instruments EDM 900 Pilots Guide - Manual (Page 11)

For Your Safe Flight Page 11
LeanFind Basics
Simply pre-lean, tap the LF button
(Lean Find) and begin leaning. The
EDM will assist you in finding the first
cylinder to peak. This example is for
Rich of Peak, ROP. See page 24 for
a more detailed description of
leaning. Press LOP to exit the ROP
mode and enter the LOP mode.
1. Establish cruise at approximately 65 to 75% power and pre-lean the
mixture to 50°F estimated rich of peak EGT on any cylinder.
2. Wait about 30 seconds, then tap the LF button.
3. Begin leaning the mixture smoothly without stopping. Turn a vernier
about ¼ turn per second; retract a non-vernier or quadrant lever so
that EGT rises about 10°F per second.
4. Stop leaning when you see LEANEST for two seconds, followed by—
for example—
EGT
1449
FF
14.7 The left number is the current
temperature of the first EGT to peak and the right number is the
current fuel flow.
5. Now tap the PEAK button to display the EGT difference from peak
which is very useful for setting desired degrees below peak.
6. Slowly enrich the mixture noting that the EGT difference diminishes
as EGT climbs back to peak, followed by it going minus again. Stop
enriching at the desired EGT difference (such as ‘EGT -75’).
7. You can also see what the peak EGT was by holding the PEAK
button.
8. Tap STEP to
exit the Lean
Find Mode.