The Lycoming LIO-320 is a horizontally opposed, air-cooled, four-cylinder aircraft
engine produced by Lycoming Engines. It is part of the Lycoming
O-320 series, which is widely used in general aviation aircraft.
The "LIO" designation indicates that this engine is specifically
designed for use in helicopters, though it is also used in
fixed-wing aircraft.
Part Number
| Model | New | Rebuilt | Overhaul |
| LIO-320-B1A | ENPL-RT8889 | RENPL-RT8889 | HENPL-RT8889 |
| LIO-320-B1A | ENPL-RT9638 | RENPL-RT9638 | HENPL-RT9638 |
| LIO-320-B1A | ENPL-RT9688 | RENPL-RT9688 | HENPL-RT9688 |
| LIO-320-C1A | ENPL-7452 | RENPL-7452 | HENPL-7452 |
Key Features of the Lycoming LIO-320:
1.Engine Type:
Horizontally opposed (flat-four) configuration.
Air-cooled.
2.Displacement:
320 cubic inches (5.24 liters).
3.Power Output:
Typically produces around 150 to 160 horsepower (HP), depending on
the specific model and configuration.
4.Fuel Type:
Designed to run on aviation gasoline (avgas), typically 100LL (low
lead).
5.Weight:
Approximately 240 to 260 pounds (109 to 118 kg), depending on the
model and accessories.
6.Applications:
Primarily used in light helicopters (e.g., the Robinson R22 and
Schweizer 300) and some fixed-wing aircraft.
7.Reliability:
Known for its durability and reliability, making it a popular
choice for training and general aviation use.
8.Maintenance:
Requires regular maintenance, including oil changes, spark plug
replacements, and inspections, as per the manufacturer's
guidelines.
Common Models in the LIO-320 Series:
LIO-320-B1A: A common variant used in helicopters.
LIO-320-C1A: Another variant with slight differences in configuration and
power output.
Helicopter Applications:
The LIO-320 is often used in light helicopters, such as:
Robinson R22: A popular two-seat training helicopter.
Schweizer 300: Another light helicopter used for training and agricultural
purposes.
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