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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).
Specifications for front and rear springs, damper loads, car weight, and buffer clearances.

Identifier  ExFiles\Box 18\3\  Scan220
Date  7th March 1931
  
To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} X7960. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}2/KT.7.3.31.
58-CN.{Mr Chamberain} Springing.

Front Springs. Piece No. F.78797.

N.S. O.S.
Loaded lbs. 1108. 1120
Loaded camber. Flat. Flat
Initial camber. 4.50" 4.46"

Rear Springs.
Loaded lbs. 1346 1368
Loaded camber. Flat Flat
Initial camber. 10.25" 10.25"

Damper Loads.
Front. - 100/95 lbs. H.P. valve drilled .032" dia.
Rear. - 60/60 lbs. No leak.

Car Weight. (Unladen) Two spare wheels. One at rear.
Front. 22 cwt 1 qr 21 lbs.
Rear. 28 cwt 2 qrs 7 lbs.
Total. 51 cwt 0 qrs 7 lbs.

Buffer Clearances.
N.S. O.S.
No Passengers. Front 1.9" 1.9"
Rear. 4.85" 4.9"
4 Passengers. Front. 1.8" 1.7"
Rear. 3.75" 3.75"

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