J.P. Instruments EDM-900 User Manual

Page 30 Engine Data Management
Lean of Peak leaning is as simple as:
A. Pre-lean your mixture.
B. Tap the LF button (verify LOP appears).
C. Lean mixture until RICHEST flashes (peak found).
D. Enrichen to the desired value ‘Lean Of Peak’.
L
Procedure
Scanner
Example
Comments
1
Establish cruise at 65
to 75% power.
2
Pre-lean the mixture to
50°F estimated rich of
peak on any EGT:
_________°F.
EGT 1490
CHT 370
* See ‘Pre-leaning’ page
31.
3
Wait one minute
Let engine stabilize.
4
Tap the LF button
LOP
Start Lean Find (if ROP
appears, hold STEP & LF
until LOP appears)
5
Lean the mixture at
approx. 10°/second
without pausing.
(cylinder I.D. box
flashes when a EGT
rises 15°F)
EGT 1520
FF 13.8
Flashing cylinder I.D. box
identifies the hottest EGT
and that an EGT has
increased at least 15°F
which arms the EDM to
now look for first EGT to
peak.
6
After the first EGT
peaks, you will see
LEANEST for one
second and bars
coming from the top
down. Continue
leaning.
EGT∆ -17
FF 12.4
When bars come from the
top down, the cylinder I.D.
box identifies the first EGT
that peaked (leanest).
Continue leaning.
7
When RICHEST
appears, fine tune the
delta EGT to the
desired degrees below
‘Peak’ (Lean of peak).
EGT∆ -45
FF 11.6
Lean of
Peak
target
leaner
richer
‘FF’
EGT
0
-40-80
Peak
8
If you hold PEAK, the
peak EGT recorded
will be displayed along
with FF spread.
EGT↑ 1560
FF∆ 0.6
Captured peak EGT value
and the FF spread between
richest and leanest
cylinders.

J.P. Instruments EDM-900 Specifications

General

Brand	J.P. Instruments
Model	EDM-900
Category	Control Panel
Language	English