The Lycoming IO-320 is a four-cylinder, horizontally opposed, air-cooled, fuel-injected
aircraft engine widely used in general aviation. It is known for
its reliability, efficiency, and versatility, making it a popular
choice for light aircraft.
Part Number
| New | Rebuilt | Overhaul |
| ENPL-RT8579 | RENPL-RT8579 | HENPL-RT8579 |
| ENPL-RT8710 | RENPL-RT8710 | HENPL-RT8710 |
| ENPL-RT9387 | RENPL-RT9387 | HENPL-RT9387 |
| ENPL-RT9525 | RENPL-RT9525 | HENPL-RT9525 |
| ENPL-RT9682 | RENPL-RT9682 | HENPL-RT9682 |
| ENPL-8578 | RENPL-8578 | HENPL-8578 |
| ENPL-RT9846 | RENPL-RT9846 | HENPL-RT9846 |
| ENPL-RT8787 | RENPL-RT8787 | HENPL-RT8787 |
| ENPL-RT8907 | RENPL-RT8907 | HENPL-RT8907 |
| ENPL-RT10021 | RENPL-RT10021 | HENPL-RT10021 |
| ENPL-RT9741 | RENPL-RT9741 | HENPL-RT9741 |
| ENPL-RT8557 | RENPL-RT8557 | HENPL-RT8557 |
| ENPL-RT8862 | RENPL-RT8862 | HENPL-RT8862 |
Key Features of the Lycoming IO-320
1.Engine Type:
Horizontally opposed, four-cylinder, four-stroke, air-cooled
engine.
Fuel-injected (as opposed to carbureted models like the O-320).
2.Displacement:
320 cubic inches (5.2 liters).
3.Power Output:
Typically produces 150–160 horsepower at 2,700 RPM, depending on the specific variant.
4.Fuel System:
Fuel-injected, which provides better fuel efficiency, smoother
operation, and improved performance at higher altitudes compared to
carbureted engines.
5.Weight:
Dry weight is approximately 258 pounds (117 kg).
6.Applications:
Commonly used in light aircraft such as the Cessna 172, Piper PA-28 Cherokee, and Grumman AA-5.
Variants of the Lycoming IO-320
The IO-320 series includes several variants, each tailored for
specific performance or installation requirements. Some notable
variants include:
1.IO-320-B1A:
Produces 160 HP.
Used in the Cessna 172 and Piper PA-28.
2.IO-320-E2A:
Produces 160 HP.
Used in the Grumman AA-5 series.
3.IO-320-D1A:
Produces 150 HP.
Used in older models of the Cessna 172.
Performance and Specifications
Compression Ratio: 8.5:1 (standard models).
Fuel Type: Aviation gasoline (100LL or equivalent).
Oil Capacity: Approximately 8 quarts (7.6 liters).
Cooling System: Air-cooled with baffling for efficient heat dissipation.
Common Aircraft Using the Lycoming IO-320
Cessna 172 (IO-320-B1A)
Piper PA-28 Cherokee (IO-320-B1A)
Grumman AA-5 series (IO-320-E2A)
Experimental and homebuilt aircraft (e.g., Van's RV series).
Contact us for prices.
