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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 showing power output for a CXII high-lift unit with varying manifold and exhaust configurations.

Identifier  ExFiles\Box 179\2\  img043
Date  4th December 1931 guessed
  
RM{William Robotham - Chief Engineer} 33
UNIT FITTED TO 20 G I CHINA
POWER OUTPUT CXII UNIT HIGH LIFT
CAMSHAFT E 57177 (110 S°) 5.76 C/R.{Sir Henry Royce}
① CUT OUT OPEN INSIDE DIA
② SMALL MANIFOLD (1.6 DOWNTAKE) FRONT EXP. BOX. PII SILENCER 1.5" FISHTAIL
③ LARGE MANIFOLD (1.875 DOWNTAKE) 1.875 STRAIGHT THROUGH
STD. CYL HEAD AND INLET VALVES
Valve Timing Diagram:
T.D.C
EX 36
IN 46°
.020 CLCE
Exhaust/Manifold Diagram:
LARGE MANIFOLD
SMALL MANIFOLD
1.6 DOWNTAKE
1.875
PII SHORT TYPE SILENCER
PII SHORT SILENCER
Graph Labels:
INDUCTION DEPN INS Hg
Axes:
COMPRESSION PRESSURE LBS/□"
B.H.P.
B.M.E.P.
R.P.M.
  
  


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