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 two vertical SU carburetor distribution setups, A and B, across a range of RPMs.

Identifier  ExFiles\Box 31\4\  Scan126
Date  10th December 1931 guessed
  
R.M. 52
COMPARISON OF DISTRIBUTION VERTICAL S U
112° CAMSHAFT WITH TWO INLET CAMS. HIGH LIFT ROCKERS
OPEN EXHAUST. INLET VALVE DIA. 1.4 WITH MIN HEAD CLEARANCE
OF .225 ROUND VALVE. VERTICAL CARB 1 7/8 THROTTLE
C/R 5.65-1 PIPE V 1207
A AIR VALVE AT RT. ANGLES TO CRANK
B PARALLEL TO ENGINE
DISTRIBUTION A DEFINATELY BETTER THAN B ESPECIALLY AT LOW SPEEDS
DISTRIBUTION A EXCELLENT OVER WHOLE RANGE
B H P
R P M
Valve Timing Diagram:
T O C 12
EX. 55
013 CLCE
IN 50°
Right Axis Labels:
B.M.E.P.
LB/IN²
IND.
DEP.
  
  


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