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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).
Test report on engine vibrations without a slipper wheel for a 48-PK car with a standard 40/50 engine.

Identifier  ExFiles\Box 25\3\  Scan131
Date  17th December 1924
  
X634
17.12.24.
48-PK CAR.
X3056
STANDARD 40/50 ENGINE.
Engine vibrations without slipper wheel.
Top direct.
M.P.H. M.P.H.
29 to 31 Retard vibrations.
35 " 36 rough 60 to 50
42 " 43 very smooth from 50 downwards.
50 " 54

M.P.H. M.P.H. 3rd. gear. Front 3 cyls. only.
14 to 16 Rear 3 cyls. firing only. 23 MPH. to 24 MPH.
20 " 22 23 MPH. to 24 MPH. 28 " very sharp.
24 " 25 29 " " 30 " 34 " to 36 MPH.
28 " 29 34 " " 36 very much worse than rear cyls.
34 " 36

Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}
  
  


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