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Bristol Neptune

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The Bristol Neptune was a seven-cylinder air-cooled radial engine developed in 1930. It had the same size cylinders as the earlier Mercury and Titan engines, 5.75 in (146 mm) x 6.5 in (165 mm) which gave a displacement of 1,182 cu in (19.3 L) and produced a maximum of 320 horsepower (239 kW). The Neptune was effectively a seven-cylinder version of the Titan.

Contents

Applications

  • Bristol Type 110

    • Specifications (Neptune I)

    Data from Lumsden.

    General characteristics

  • Type: 7-cylinder air-cooled radial engine.
  • Bore: 5.75 in (146 mm)
  • Stroke: 6.5 in (165 mm)
  • Displacement: 1,182 cu in (19.3 L)
  • Diameter: 48.4 in (1229.3 mm)
  • Dry weight: 630 lb (286 kg)
  • Designer: Roy Fedden

    • Components

  • Valvetrain: Overhead valve, Four valves per cylinder
  • Fuel type: 73-77 octane petrol
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive, left hand tractor

    • Performance

  • Power output: 295 hp (220 kW) at 1,700 rpm (rated power), 320 hp (239 kW) at 1,870 rpm at sea level
  • Compression ratio: 5:1
  • Power-to-weight ratio: 0.5 hp/lb (0.83 kW/kg)

    • References

    Bristol Neptune Wikipedia
    (Text) CC BY-SA


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