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 of PII BMEP curves for various engine configurations, taken with open exhaust.

Identifier  ExFiles\Box 13\2\  02-page085
Date  3rd June 1921
  
CURVE(3A)
PII BMEP CURVES. ALL TAKEN OPEN EXHAUST
(A) R.R.CH.EAGLE IX CARB. (4.9:1 COMP.RATIO)(R.TYPE 110° CAMSHAFT)
(B) TWIN CARBS 1.4 CHOKES ( " " " )( " " " )
(C) TWIN CARBS 1.3 CHOKES (4.6:1 STD. COMP.RATIO)(STANDARD CAMSHAFT)
(D) STANDARD CARB. ( " " " )( " " )
BMEP
RPM
120
110
100
90
80
70
60
500
1000
1500
2000
2500
3000
3500
A
B
C
D
L.M.S 3-6-21
  
  


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