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Pratt & Whitney R-985 Wasp Junior
Specifications

R-985 Wasp Junior SB

General characteristics
Type: 9-cylinder supercharged air-cooled radial piston engine
Bore: 5 316 in (132 mm)
Stroke: 5 316 in (132 mm)
Displacement: 985 cu in (16.14 L)
Length: 41.59 in (1,056 mm)
Diameter: 45.75 in (1,162 mm)
Dry weight: 640 lb (290 kg)

Components
Valvetrain: Two overhead valves per cylinder, pushrod-actuated
Supercharger: Single-speed gear-driven General Electric centrifugal supercharger, with impeller driven at 10 times crankshaft speed
Fuel type: 80/87 grade aviation gasoline
Reduction gear: Direct drive

Performance
Power output:
- 400 hp (298 kW) at 2,200 RPM up to 5,000 ft (1,500 m)
- 450 hp (336 kW) at 2,300 RPM for takeoff
Specific power: 0.406 hp/inĀ³ (18.5 kW/L)
Compression ratio: 6.0:1
Power-to-weight ratio: 0.625 hp/lb (1.03 kW/kg)


Sources:
Wikipedia
P&W R-985 Maintenance Manual 1977
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