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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).
Blueprint graph of engine power output and valve timing for a Japan Unit with R.R. Carbs.

Identifier  ExFiles\Box 5a\5\  05-page191
Date  12th December 1931
  
POWER OUTPUT WITH R.R. CARBS TO LEC 2924
JAPAN UNIT 112º SHAFT. INLET & EXHAUST CAMS TO E.55358
HIGH LIFT ROCKERS OPEN EXHAUST. INLET VALVE DIA 1.6
MACHINED TO GIVE MIN CLCE .225 ROUND VALVE.
C.R. 5.25-1 CHOKE DIA 90
RM.{William Robotham - Chief Engineer}58
Valve Timing Diagram:
T.D.C
12
EX
59
OPE CLCE
IN
50.7
Axes Labels:
B.H.P.
R.P.M
I.M.E.P. & B.M.E.P. NOTATION
Date: 12-12-31
  
  


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