Operating Conditions; Performance Curves - Lycoming O-290 Operator's Manual

LYCOMING OPERATOR'S MANUAL
O-235 AND O-290 SERIES
Oil Pressure, psi –
Model
O-235 –C, -E, -F, -G, -H2C, -J,
-K, -M
O-235-B
O-235-L*, -N
O-235-P
O-290-D
O-290-D2
* - Front of engine
Fuel Pressure, psi –
Model
All O-235 models, O-290-D2
O-290-D
Average Ambient Air
Temperature
Above 60°F (15.5°C)
30°F (-1.11°C) to 90°F (32.2°C)
0°F (-17.8°C) to 70°F (21.1°C)
Below 10°F (-12.2°C)
Engine oil temperatures should not be below 140°F (60°C) during continuous operation.
Operation
Normal Rated
Performance Cruise
(75% Rated)
Economy Cruise
(65% Rated)
* - At Bayonet Location – For maximum service life of the engine, maintain cylinder head temperatures
between 150°F (65°C) and 400°F (204°C) during continuous operation.

OPERATING CONDITIONS

Maximum Minimum
90
90
90
90
85
90
90
Desired
180°F (82°C)
180°F (82°C)
170°F (77°C)
160°F (71°C)
O-235-C, -E
RPM HP Gal./Hr.
2800 115
2350 86
2250 75
OPERATING INSTRUCTIONS
Idling
60 25
60 15
60 15
55 15
60 25
60 25
50 15
Maximum Desired
8
5
Oil Inlet Temperature
Fuel Max.
Cons. Oil Cons.
Qts./Hr.
10.7 0.52
7.3 0.29
5.8 0.25
SECTION 3
Start and Warm-Up
100
100
115
115
100
Minimum
3 0.5
3 0.5
Maximum
245°F (118°C)
245°F (118°C)
245°F (118°C)
245°F (118°C)
*Max.
Cyl. Head
Temp.
500°F (260°C)
500°F (260°C)
500°F (260°C)
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