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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Design position report detailing the status of modifications for 20/25 HP, Phantom II, and Spectre chassis and engines.

Identifier  ExFiles\Box 30\3\  Scan186
Date  3rd June 1935 guessed
  
ITEM. (2) DESIGN POSITION.

20/25 HP. CHASSIS โ€” CONTINUED.

Modified axle tube for hypoid axle. Completed.
Modification to side spare wheel carrier to suit 17" wheels. Completed.
Bonnet with sloping shutters. In hand.
Automatic mixture weakening device to improve petrol consumption. In hand.

PHANTOM II CHASSIS.

Noise insulated dashboard. Abandoned.

PHANTOM II TANK ENGINES.

Modified position of air cleaner. In hand.

SPECTRECodename for Phantom III CHASSIS.

Cylinder head modifications. Put aside.
Relay operated change gear control. In hand.
Gearbox:- casing mods. to take larger bearings for Cadillac 45° gears. In hand.
" permanent scheme for ball bearings for existing SpectreCodename for Phantom III gears. In hand.
Air cooled dynamo and drive โ€“ 1½ times engine speed. In hand.
  
  


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