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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).
Progress report listing various modifications and their current status, including work on the Spectre engine.

Identifier  ExFiles\Box 30\4\  Scan250
Date  16th July 1934 guessed
  
(3)

ITEM
DESCRIPTION.
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Extension to universal swan neck. Completed.
Flexible engine mounting.- tie rod from pedal shaft to crankcase. In hand.
Exhaust suspension for flexible engine mounting. In hand.

SPECTRECodename for Phantom III ENGINE.
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Alternative connecting rods. In hand.
Rear axle buffer - improved type. In hand.
Wider S/M clutch cones for 2nd and 3rd speeds. In hand.
Variable periodicity device in spring cylinder I.F.W.S. In hand.
Modified piping and wiring to suit engine controls. Completed.
Modifications to switchbox - switching for warning light and petrol pumps. In hand.
Head lamp fixing and wing stay. Completed.
Suggested layout of front wings and valances (various schemes). Completed.
Filter for auto adjusting tappets. In hand.
Alternative short duration camshaft and valve springs to suit. In hand.
Single plate clutch. In hand.
Cylinder liner in Austenitic steel. Completed.
Lightened fan hub and pulley. Completed.
  
  


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