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).
Graph comparing engine performance (B.M.E.P vs R.P.M) for different inlet and exhaust valve durations.

Identifier  ExFiles\Box 13\2\  02-page096
Date  12th June 1931 guessed
  
SHEET II
BEST COMPROMISE OF INLET & EXHAUST VALVE DURATIONS
TWIN CARBS CAMSHAFTS TO E 32381 PH. II UNIT
4.9 COMP. RATIO.
OPEN EXHAUST
B.M.E.P.
EX. 040
INLET 030
INLET .030
Ex. .050
INLET .020
Ex. .050
INLET .020
Ex. .040
INLET .006
Ex. .008
B.M.P 165
161.3
158.5
Left Diagram:
Ex.236
256 IN
18
0
48 S
58
INLET LIFT .480
Ex. LIFT .460
BEST TIMING R.{Sir Henry Royce} ENGINE
CAMSHAFT IN .020 EX .040
Right Diagram:
Ex 241
IN 226
55
76
53 S
52
BOTH VALVES LIFT .420
BEST TIMING STD.
SHAFT SCH. 1053
  
  


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