J.P. Instruments EDM 700/800/711 Pilots Guide User Manual

Page 17

For Your Safe Flight

Page 13

LeanFind Procedure—Step-by-Step

Procedure

Example

Comments

Establish cruise at approx.
65 to 75% power.

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.

Wait one minute

Let engine stabilize.

Tap the LF button

LEAN R

Start LeanFind. (Optionally to
change to “lean of peak”
method, hold both STEP and
LF simultaneously.)

Lean the mixture—approx.
10°/second without
pausing—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.

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.

If you hold LF, peak EGT will
be displayed while the LF
button is held down.

I560 PK

Captured peak EGT value is
displayed.

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

Best

power

Temperature when

column flashes

best economy

leaner

richer

If you have chosen the Lean
of Peak method, at step 5
continue leaning until the last
cylinder has peaked.

-I5 SET
OR
-I5 I2.3

Only for GAMI injected
engines. When each cylinder
reaches peak, the cylinder
number will begin flashing.

*Determining the pre-lean value: while in cruise at under 65 percent
power, choose any cylinder and lean that cylinder to peak EGT in the
Manual mode or to engine roughness, whichever occurs first. Note the
peak, subtract 50° and write the resulting number in the space provided
in step 2.

LeanFind Procedure—General Explanation