Pratt & Whitney R-985 Wasp Junior Specifications (R-985 Wasp Junior SB) Specifications for different R-985 Wasp Junior variants

| Engine | Power_continuous | Critical_altitude_This_is_the_highest_altitude_at_which_the_engine_can_achieve_its_full_continuous_power_rating_Above_this_altitude_power_falls_off_with_height_as_with_a_naturally_aspirated_engine_See_Supercharger_Altitude_effects_for_details_ | Power_takeoff | Compression_ratio | Supercharger_gear_ratio | Octane_rating | Dry_weight |
|---|---|---|---|---|---|---|---|
| Wasp Jr. A | hp (kW) at 2,000 RPM | sea level | same | 5.0:1 | 7:1 | 68 | lb (kg) |
| Wasp Jr. TB | hp (kW) at 2,200 RPM | sea level | hp (kW) at 2,300 RPM | 6.0:1 | 8:1 | 80 | lb (kg) |
| Wasp Jr. SB | hp (kW) at 2,200 RPM | ft (m) | hp (kW) at 2,300 RPM | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. T1B2 | hp (kW) at 2,300 RPM | ft (m) | same | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. B4 | hp (kW) at 2,300 RPM | ft (m) | same | 6.0:1 | 10:1 | 80/87 | lb (kg) |