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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 showing desirable camshaft timing diagrams for the 40/50 model.

Identifier  ExFiles\Box 13\2\  02-page106
Date  18th June 1931 guessed
  
DESIRABLE CAMSHAFTS FOR THE 40/50
ALL TIMINGS .073" CLCE

Diagram 1:
112° 25 H.P.
INLET23D
EX.240
Numbers: 1, 0°, 11°, 49, 49

Diagram 2:
116° 40/50 LIFT .420
IN.226
EX.241
Numbers: 2, 5-5°-6, 53.5, 52

Diagram 3:
BEST TIMING OBTAINABLE USING 40/50 EX. CAMS.
114° CAMS.
IN.240
EX.240
Numbers: 2, 10°, 50, 58

Diagram 4:
IN.236
EX.236
Numbers: 3, 8, 48, 56, 4

Text Box:
ASSUMING THAT WE ARE UNABLE TO OPEN THE INLET VALVE MUCH BEFORE T.D.C. ON ACCOUNT OF "ROARING". WE CONSIDER 3 WOULD BE THE BEST TIMING WE CAN GET WITH EXISTING CAM FORMS WHILST 4 MIGHT BE PREFERABLE WITH NEW CAM FORMS. CAMSHAFT 1 WE KNOW GIVES GOOD RESULTS.
  
  


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