🏷️ Basic Information Identification Make: Pratt & Whitney Model: R-985 Wasp Junior Year: N/A (Historical Engine) Generation: N/A 📋 Manual Details Documentation Manual Type: Operation Manual Language: English Page Count: 217 Format: PDF ⚙️ Engine Specifications Performance Engine Type: Radial Air-Cooled Cylinders: 9 Displacement: 985 cubic inches (16.1 L) Bore: 4.5 inches (114.3 mm) Stroke: 5.5 inches (139.7 mm) Compression Ratio: 5.5:1 Power Output: 450 hp (336 kW) at 2300 rpm Torque: N/A Cooling System: Air Cooled 🔧 Transmission Drivetrain Type: Direct Drive or Geared Gears: N/A (Not applicable to engine) 📐 Dimensions Physical Length: N/A Width: N/A Height: N/A Weight: Approximately 650 lbs (295 kg) 🔧 Maintenance Servicing Service Interval: Refer to Manual Oil Capacity: 10 gallons (37.8 L) Recommended Oil Type: Refer to Manual (Aviation Grade Oil) 📄 Operational Fuel Fuel Type: Aviation Gasoline (Avgas) Fuel Octane Rating: 80/87 or higher Ignition Ignition System: Dual Magnetos Lubrication Lubrication System: Wet Sump