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).
Power output graph for a 'Japan Unit' engine with specified carburettor, camshaft, and valve modifications.

Identifier  ExFiles\Box 179\2\  img058
Date  12th December 1931
  
RM.{William Robotham - Chief Engineer} 58
POWER OUTPUT WITH R.R. CARBS TO LEC 2924
JAPAN UNIT. 112° SHAFT. INLET & EXHAUST CAMS TO E.55358
HIGH LIFT ROCKERS OPEN EXHAUST INLET VALVE DIA 1.4
MACHINED TO GIVE MIN CLCE .225 ROUND VALVE
C.R. 5.85-1 CHOKE DIA .90"

Valve Timing Diagram:
T.D.C. 12
EX 59
DIZ CLCE
IN 507

Graph Axes:
X-Axis: R.P.M
Y-Axis Labels (Left): p, I, B
Y-Axis Labels (Right): p, M, B
  
  


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