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:

1.Configuration:

Horizontally opposed (flat-six) configuration.

Six cylinders, air-cooled.

2.Displacement:

541.5 cubic inches (8.87 liters).

3.Power Output:

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

Some turbocharged versions can produce even higher power outputs.

4.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.

5.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.

6.Weight:

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

7.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.

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