Page 14 Engine Data Management
LeanFind Procedure—Step-by-Step
Procedure Example Comments
1
Establish cruise at approx.
65 to 75% power.
2
PRE-LEAN THE MIXTURE
TO 50°F ESTIMATED RICH
OF PEAK EGT ON ANY
CYLINDER: _____°
I490
370
*For your first flight with the
EDM, use the method shown
below.
3
Wait one minute Let engine stabilize.
4
Tap the LF button
LEAN
R
Start LeanFind. (Optionally to
change to “lean of peak”
method, hold both STEP and
LF simultaneously.)
5
Lean the mixture—approx.
10°/second—while observing
the display. When there is a
15°F rise in EGT, LeanFind
mode becomes active.
I520
LF
Without FF
I520
I3.8
With FF
Flashing cylinder DOT
indicates hottest cylinder and
that LeanFind mode is active.
6
Stop leaning when
a column begins flashing.
You will see LEANEST for two
seconds, followed by:
I545
SET
or with
Fuel Flow
I545
I 2.4
Flashing cylinder dot &
column indicates leanest
cylinder. (SET means Set the
mixture.) Due to thermal
inertia this will usually be
about -15°F lean of peak.
7
If you hold LF, peak EGT will
be displayed while the LF
button is held down.
I560
PK
Captured peak EGT value is
displayed.
8
Slowly enrich the mixture. the
temperature will increase,
returning to peak.
Stop enriching at the desired
EGT.
Best economy
Best power
I560
SET
I560
SET
I460
SET
• Peak EGT for best
economy
• 100° rich of peak for best
power
9
If you have chosen the Lean
of Peak method, at step 5
continue leaning until the last
cylinder has peaked.
-I5
SET
OR
Only for GAMI injected
engines. When each cylinder
reaches peak, the cylinder
number will begin flashing.
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