The Lycoming IO-540 series is a family of air-cooled, horizontally opposed, six-cylinder aircraft engines produced by Lycoming Engines. These engines are widely used in general aviation aircraft, particularly in single-engine and twin-engine planes. The IO-540 series is known for its reliability, power output, and versatility, making it a popular choice for a variety of aircraft applications.

Part Number

Key Features of the Lycoming IO-540 Series:

Configuration:

Horizontally opposed (flat-six) configuration.

Six cylinders, air-cooled.

Displacement:

541.5 cubic inches (8.87 liters).

Power Output:

Depending on the specific model, power output ranges from 235 to 300 horsepower.

Some turbocharged versions can produce even higher power outputs.

Fuel System:

Fuel-injected (denoted by the "IO" in the name, which stands for "fuel-injected, opposed"Provides better fuel efficiency and performance compared to carbureted engines.

Applications:

Commonly used in popular aircraft such as the Cessna 182, Piper PA-32 Cherokee Six, Van's RV-10, and many others.

Suitable for both fixed-wing aircraft and experimental/homebuilt aircraft.

Weight:

Weighs approximately 320 to 350 pounds (145 to 159 kg), depending on the model and accessories.

Reliability:

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

Regular maintenance and adherence to manufacturer guidelines are critical for optimal performance.

Variants:

The IO-540 series includes several models, such as the IO-540-A, IO-540-B, IO-540-C, and more.

Variations include differences in horsepower, compression ratios, and accessory configurations.

Common Aircraft Using the IO-540 Series:

Cessna 182 Skylane

CessnaT 206H

Robinson R44

Gipsaero GA8

Piper PA-32 Cherokee Six

Van's RV-10

Kitty Hawk LE500

Aerostar 600

Lancair IV

Maintenance and Operation:

Regular oil changes, inspections, and adherence to Lycoming's service bulletins are essential for maintaining engine health.

Proper break-in procedures are critical for new or overhauled engines to ensure longevity.

Pilots and mechanics should monitor engine parameters (oil pressure, temperature, etc.) during operation to detect any potential issues early.

Performance Considerations:

The IO-540 series engines are known for their smooth operation and consistent power delivery.

Fuel-injected models offer better altitude performance and fuel efficiency compared to carbureted engines.

Turbocharged versions (e.g., TIO-540) are available for high-altitude operations.

The Lycoming IO-540 series remains a cornerstone of general aviation, offering a balance of power, reliability, and efficiency for a wide range of aircraft.

​

Contact us for prices.