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IO-390-D Series Engine Installation and Operation Manual
ENGINE SPECIFICATIONS AND OPERATING LIMITS
Number of Cylinders
Cylinder Arrangement - Firing Order
Spark Plugs
Ignition timing advance
Maximum Continuous Horsepower
Performance Cruise (75% Rated)
Economy Cruise (65% Rated)
Fuel Consumption, Cruise
Propeller Drive Ratio
Propeller Shaft Rotation
Counterweight Order
Bore
Stroke
Piston Displacement
Compression Ratio
Weight (lb)
Dimensions
Dimensions
Oil Sump Capacity
Minimum quantity of oil in flight
Oil Grade Specification
NOTICE: During the first 50 hours of engine operation
of a new, rebuilt, or overhauled engine, it is
recommended that this engine be operated
with mineral oil until oil consumption has
stabilized.
Oil Grade at All Temperatures
Oil Grade at Temperatures above 80°F (27°C)
Oil Grade at Temperatures above 60°F (16°C)
© 2020 Avco Corporation. All Rights Reserved
March 2020
APPENDIX A
Table A-1
IO-390-D Series Engine Specifications
75% rated power
65% rated power
D1A6 and D3A6 288 lb.
D1B6 and D3B6 285 lb.
D1A6 and D3A6
D1B6 and D3B6
4
1-3-2-4
8
20º BTC - Variable
215 HP @ 2700 rpm & 0.47
161 @ 2450 rpm
140 @ 2350 rpm
13.1 gph
10.0 gph
1:1
Clockwise
One 6.3 order and one 8th order
pendulum-type counterweight
5.319 in.
4.375 in.
3
389 in.
8.9:1
Height 20.96 in.
Width 34.37 in.
Length 32.56 in.
Height 22.52 in.
Width 34.37 in.
Length 29.08 in.
7 quarts
3.5 quarts
SAE J1966 or
MIL-L-6082B
Ashless Dispersant
SAE Grades
------
15W-50 or 20W-50
60
50
13.510 cm
11.1 cm
3
6 374.6 cm
130.6 kg
129.3 kg
53.24 cm
87.30 cm
82.70 cm
57.20 cm
87.30 cm
73.86 cm
6.6 liters
3.3 liters
SAE J1899 or
MIL-L-22851
SAE Grades
60
40 or 50
Appendix A
Page 51
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