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 engine BHP and induction depression versus RPM, comparing performance with two different carburetter choke sizes.

Identifier  ExFiles\Box 13\3\  03-page352
Date  10th October 1931 guessed
  
DEPRESSION WITH VARIOUS CHOKE SIZES.
P1
STANDARD CAMSHAFT
VALVE LIFT .480

TABLE DATA:
CARBURETTER | CHOKE DIA. | DIFFUSER AREA | FREE AREA THROUGH CHOKE | THROTTLE | BARREL
R.R.C.H. A | 1.40 | .28 SQ IN | 1.25 SQ IN | [Full] | 1-4
HAWK C.H. B | 1.10 | .77 SQ IN | .77 SQ IN | [Full] | 1-4

VALVE TIMING DIAGRAM:
IN: 7.5, 55
EX: 55, SI
.013 CLCE

AXES LABELS:
Left Y-Axis: B.H.P.
Right Y-Axis: INDUCTION DEPN. INS. HG.
X-Axis: R.P.M.
  
  


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