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 graph of 110° and 114° camshaft timings, showing B.H.P and B.M.E.P against R.P.M.

Identifier  ExFiles\Box 13\2\  02-page112
Date  24th June 1931 guessed
  
BEST TIMING 110° SHAFT COMPARED WITH BEST
TIMING 114° SHAFT CAM. FORMS E.32381
4.9 C.R. OPEN EXHAUST TWIN CARBS. 1.4 CHOKES.
ALUM. HEAD. STD. VALVES
INLET 2.0" EX 1.85"
.020 CLCE
STD CAMSHAFT
SAME CONDITIONS
TAPPET CLCE .020
B.H.P.
B.M.E.P.
R.P.M.
H.S. 404
Valve Timing Diagram (STD CAMSHAFT): 02, 46, 47
Valve Timing Diagram B: 19, 7.5, 67, 59
Valve Timing Diagram A: 17, 18, 56, 59
  
  


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