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Rolls Royce Pennine

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The Rolls-Royce Pennine was a British 46-litre air-cooled sleeve valve engine with 24 cylinders arranged in an X formation. It was an enlarged version of the 22-litre Exe; a prototype engine was built and tested, but never flew. The project was terminated in 1945, being superseded by the jet engine.

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A 100-litre 5,000 hp X32 (twin-X16) version of the Exe/Pennine, known as the Exe 100, was to have become the Rolls-Royce Snowdon.

Rolls-Royce air-cooled engines, intended for commercial transport aeroplane use, were named after British mountains, e.g. The Pennines and Mount Snowdon.

General characteristics

  • Type: 24-cylinder supercharged liquid-cooled 90 degree X layout aircraft piston engine
  • Bore: 5.4 in (137.1 mm)
  • Stroke: 5.0 in (127 mm)
  • Displacement: 2791 in³ (45.73 l)
  • Length: 106 in (2692 mm)
  • Width: 39 in (991 mm)
  • Height: 37.5 in (952 mm)
  • Dry weight: 2,850 lb (1,293 kg)

    • Components

  • Valvetrain: Sleeve valve
  • Supercharger: Gear-driven centrifugal type supercharger, single stage, two speed
  • Fuel type: Petrol
  • Cooling system: Pressure air-cooled

    • Performance

  • Power output: 2,740 hp (2,043 kW) at 3,500 rpm, +12 psi boost at sea level
  • Power-to-weight ratio: 0.96 hp/lb (1.58 kW/kg)

    • References

    Rolls-Royce Pennine Wikipedia
    (Text) CC BY-SA