The Lycoming IO-390 series represents modern, fuel-injected, four-cylinder, horizontally opposed aircraft engines engineered for light general aviation and experimental aircraft applications. As part of Lycoming's Thunderbolt series, these engines deliver exceptional performance, efficiency, and reliability.

• Engine Type: 4-cylinder, horizontally opposed (flat-four)
• Displacement: 390 cubic inches (6.4 liters)
• Power Output: 210 horsepower (157 kW) at 2,700 RPM
• Compression Ratio: 8.9:1
• Fuel System: Fuel injection (Airflow Performance or equivalent)
• Cooling System: Air-cooled
• Weight: Approximately 267 lbs (121 kg) dry
• Fuel Type: 100LL aviation gasoline or approved unleaded alternatives
• Oil Capacity: 8 quarts (7.6 liters)

• IO-390-C Series: 210 hp for experimental and light sport aircraft (Van's RV-14, Cirrus SR20)
• IO-390-A Series: 210 hp for certified aircraft (CubCrafters XCub)
• IO-390-EXP119: Specialized variant for experimental aircraft with specific performance requirements

• Experimental and Kit-Built Aircraft: Van's RV-14, RV-10, and other high-performance homebuilts
• Certified Aircraft: CubCrafters XCub and Carbon Cub SS
• Light Sport Aircraft: Modern LSA designs requiring compact, high-output powerplants

• TBO (Time Between Overhauls): 2,000 hours or 12 years (whichever comes first)
• Maintenance Requirements: Regular oil changes, inspections, and adherence to Lycoming service bulletins

The IO-390 features larger displacement (390 cubic inches vs. 360 cubic inches) and higher power output (210 hp vs. 180-200 hp) compared to the IO-360 series, making it ideal for aircraft requiring enhanced performance or upgrades to older airframes.