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 graph comparing high and low lift rockers on a 114° Camshaft E 82448.

Identifier  ExFiles\Box 13\2\  02-page160
Date  28th November 1931
  
RM.{William Robotham - Chief Engineer} P.38
COMPARISON OF HIGH AND LOW LIFT
ROCKERS ON THE 114° CAMSHAFT E 82448
TWIN CHOKE CARBS 1·4 CHOKES OPEN EX: MANIFOLD ONLY
C/R 4·65-1 STD: CYL: HEAD AND VALVES 1·9 VALVE THROAT
B.H.P
B.M.E.P LBS/SQ"
R.P.M.
STD ROCKERS
HIGH LIFT ROCKERS
Top Valve Timing Diagram:
EX
IN
.020 CLCE
3·7
10·5
54·5
50·3
Bottom Valve Timing Diagram:
EX
IN
.013 CLCE
1
15
60·3
55
Graph Axis Labels:
Left Y (B.H.P): 80, 90, 100, 110, 120, 130, 140, 150
Right Y (B.M.E.P LBS/SQ"): 60, 70, 80, 90, 100, 110, 120
X (R.P.M.): 500, 1000, 1500, 2000, 2500, 3000, 3500
  
  


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