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 curves and valve timing diagrams for a Phantom II engine, comparing three different camshaft specifications.

Identifier  ExFiles\Box 13\2\  02-page127
Date  6th August 1931 guessed
  
P.II. POWER CURVES (ALL TAKEN OPEN EXHAUST)
A R.{Sir Henry Royce} TYPE 110° SHAFT. TWIN CARBS 1.300 DIA CHOKES. STD COMP RATIO
B. W.W. " 120° SHAFT. " " " " "
C STD. 116° SHAFT. " " " " "
B.H.P.
R.P.M.
M.E.P. lbs/sq in
TIMING WITH .013 TAPPET CLEARANCE
DIAGRAM A:
I.O. TDC E.C.
26° 23°
I.C. B.D.C. E.O.
66° 67°
VALVE L... CAM...
DIAGRAM B:
I.O. TDC E.C.
3.7°
I.C. B.D.C. E.O.
62.5° 65°
VALVE LIFT .469 CAM 358
DIAGRAM C:
I.O. TDC E.C.
10°
I.C. B.D.C. E.O.
52° 50°
VALVE LIFT .429 CAM .3246
  
  


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