Lycoming HIO-360 Series Aircraft Engine

The Lycoming HIO-360 series is a specialized, four-cylinder, horizontally opposed, air-cooled aircraft engine designed primarily for helicopter applications.

Part Number

Key Specifications

• Type: Four-cylinder, horizontally opposed (flat-four), air-cooled
• Displacement: 361 cubic inches (5.9 liters)
• Power Output: Typically produces 180 to 190 horsepower (depending on the specific model and configuration)
• Compression Ratio: Varies by model, typically 8.5:1
• Weight: Approximately 260 to 280 pounds (dry weight, depending on the model)
• Fuel Type: Aviation gasoline (100LL)
• Cooling: Air-cooled
• Ignition System: Dual magnetos for redundancy
• Redline RPM: Typically 2,700 RPM
• Fuel System: Fuel-injected (precise fuel delivery for improved performance)

Applications

The HIO-360 engine is primarily used in helicopters, including:

• Bell 47 (popular light helicopter)
• Schweizer 300 (light utility and training helicopter)
• Enstrom F-28 (light utility helicopter)

Variants

The HIO-360 series includes several models, each tailored for specific helicopter applications. Some notable variants include:

• HIO-360-A1A: 180 hp, fuel-injected, used in the Bell 47.
• HIO-360-B1A: 180 hp, fuel-injected, used in the Schweizer 300.
• HIO-360-C1A: 180 hp, fuel-injected, used in the Enstrom F-28.
• HIO-360-D1A: 190 hp, fuel-injected, high-performance variant for specific helicopter models.

Features

• Helicopter-Specific Design: Optimized for rotary-wing aircraft, with modifications to handle the unique demands of helicopter operations.
• Fuel Injection: Provides precise fuel delivery, improved performance, and better fuel efficiency.
• Dual Magneto System: Ensures redundancy and reliability in ignition.
• Robust Construction: Built to withstand the rigors of helicopter operations, including continuous high-power settings.
• Adaptability: Can be used in both light utility and training helicopters.

Maintenance and Overhaul

• Time Between Overhauls (TBO): Typically 1,800 to 2,000 hours or 12 years, depending on usage and maintenance practices.
• Common Maintenance Tasks: Regular oil changes, spark plug replacements, and inspections of cylinders, valves, and fuel injection system.
• Overhaul Costs: Overhaul costs can range from $\mathrm{<span\; style="font-size:16px;">25</span>}<span\; style="font-size:16px;">,</span>\mathrm{<span\; style="font-size:16px;">000</span>}\mathrm{<span\; style="font-size:16px;">t</span>}\mathrm{<span\; style="font-size:16px;">o</span>}$$25,000to$35,000, depending on the extent of work required.

Advantages

• Reliable and proven performance in helicopter applications.
• Fuel injection provides better fuel efficiency and throttle response.
• Designed to handle the continuous high-power demands of rotary-wing operations.
• Wide availability of parts and support.