Lycoming O-235 Series Aircraft Engine

The Lycoming O-235 series is a family of air-cooled, horizontally opposed, four-cylinder aircraft engines produced by Lycoming Engines. These engines are widely used in general aviation, particularly in light aircraft, trainers, and homebuilt planes. The O-235 series is known for its reliability, simplicity, and versatility, making it one of the most popular engines in its class.

Part Number

Key Features of the Lycoming O-235 Series:

1.Configuration:

Horizontally opposed (flat-four) cylinder arrangement.

2.Air-cooled design.

Displacement:

235 cubic inches (3.85 liters).

3.Power Output:

Depending on the specific model, the O-235 series produces between 108 to 125 horsepower at 2,600–2,800 RPM.

4.Fuel System:

Available in both carbureted (O-235) and fuel-injected (IO-235) versions.

Designed to run on 100LL avgas.

5.Weight:

Dry weight is approximately 244–260 pounds (111–118 kg), depending on the model.

6.Compression Ratio:

Typically 7.0:1 or 8.5:1, depending on the variant.

7.Applications:

Commonly used in aircraft such as the Cessna 152, Piper PA-38 Tomahawk, Grumman AA-1, and many experimental/homebuilt aircraft.

8.Propeller Drive:

Direct drive (non-geared) configuration.

9.Reliability:

Known for its durability and long service life when properly maintained.

Popular Models in the O-235 Series:

1.O-235-C:

Produces 108 HP.

Used in early Cessna 152 models.

2.O-235-L2C:

Produces 110 HP.

Commonly found in the Piper PA-38 Tomahawk.

3.O-235-N2C:

Produces 108 HP.

Used in later Cessna 152 models.

4.O-235-F:

Produces 115 HP.

Used in experimental and homebuilt aircraft.

Advantages of the O-235 Series:

1.Reliability:

Proven design with decades of service in general aviation.

2.Simplicity:

Easy to maintain and repair compared to more complex engines.

3.Versatility:

Suitable for a wide range of light aircraft, including trainers and homebuilt planes.

4.Cost-Effective:

Lower operating and maintenance costs compared to larger engines.

Applications in Aviation:

• Training Aircraft: Widely used in flight schools due to its reliability and lower operating costs.
• Light Sport Aircraft: Popular in aircraft like the Cessna 152 and Piper Tomahawk.
• Experimental/Homebuilt Aircraft: Often chosen for its simplicity and affordability.

The Lycoming O-235 series remains a cornerstone of general aviation, offering a balance of reliability, simplicity, and affordability. It is an excellent choice for trainers, light aircraft, and homebuilt planes, making it one of the most widely used aircraft engines in the world.

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