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).
Performance comparison chart of masked versus unmasked camshafts with different lift rockers.

Identifier  ExFiles\Box 13\2\  02-page153
Date  29th October 1931 guessed
  
RM{William Robotham - Chief Engineer} P 30.
COMPARISON OF 108° MASKED CAMSHAFT AND
114° E82448 UNMASKED CAMSHAFT
OPEN EX. C/R 4.7 HIGH LIFT ROCKERS TWIN CARBS 1.4 CHOKES
MASKED CAMSHAFT INLET LIFT .547 EXHAUST .469
B.H.P.
R.P.M.
INDUCTION DEPN. INS. HG.
Diagram C:
EX, IN, .020 CLCE, 22.75, 52, 49
Diagram A:
EX, IN, HIGH LIFT ROCKERS .020 CLCE, 20, 4, 18.6, 41, 43.8, 67.8
Diagram B:
EX, IN, HIGH LIFT ROCKERS .020 CLCE, 1.5, 12, 25.5, 46.0, 38.5, 62.5
Other Text:
114° SHAFT E.82448 VALVE LIFT INCR TO .525
Graph Curves: A, B, C
  
  


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