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

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).

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