Rolls-Royce Archives
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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).
Performance graph from Brooklands tests comparing different engine configurations and their outputs.

Identifier  ExFiles\Box 29\3\  Scan328
Date  19th June 1931
  
H.S. 401
BROOKLANDS TESTS 19/6/31
LAP SPEED C.O. CLOSED 18GW 68.7 M.P.H.
G.S.R.14 63 M.P.H.

Upper Test Unit:
18 GW 35.7 CWTS
JAPAN UNIT TWIN ZENITHS
26 M/M CHOKES 112° CAMSHAFT
PIT REAR SILENCER & FISHTAIL
TIMING SEE SHEET 2
C.O. CLOSED

Lower Test Unit:
14 G.S.R. 33.7 CWTS
CHINA UNIT C/R 5.25
17% LARGER R.R. CARB.
C.O. CLOSED 110° SHAFT
STD. 25 H.P SYSTEM E.55794

AXIS LABELS:
CLUTCH H.P.
B.M.E.P.
ENGINE R.P.M.
ROAD SPEED M.P.H.
  
  


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