J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 7)

For Your Safe Flight Page 3
From the cockpit you can adjust the fuel/air ratio by a process called
leaning. Retarding the mixture control changes the fuel/air ratio and
hence the resulting Exhaust Gas Temperature (EGT).
The following figure depicts the mixture and temperature relationship.
E
G
T
°F
b
e
lo
w
p
e
a
k
P
e
rc
e
n
t
o
f
b
e
s
t
p
o
w
e
r
C
H
T
°F
c
h
a
n
g
e
fr
o
m
b
e
s
t
p
o
w
e
r
Best
power
range
0
-100
-50
-20
20
-60
-40
0
-80
100
85
90
95
80
Perc
ent p
owe
r
Sp
ecif
ic
fue
l co
nsu
m
ptio
n
Too
lean
Lean
Rich
Full Rich
(Take-off)
EG
T
CH
T
First cylinder to
peak. Use for
Rich of Peak
leaning
Last cylinder to
peak. Use for
Lean of Peak
leaning with GAMI
injectors
Peak Power
Best
economy
range
GAMI
spread
As the mixture is leaned, EGT rises to a peak temperature, and then
drops as the mixture is further leaned. Peak power occurs at a mixture
using more fuel than at peak EGT. Best economy occurs at peak EGT.
Accurate leaning yields optimal engine temperatures. By being able to
precisely adjust the mixture, your engine can produce either the best fuel
economy or maximum power, whichever you choose.