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 S.U. carburettor setups based on air valve orientation.

Identifier  ExFiles\Box 179\2\  img041
Date  10th December 1931 guessed
  
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

Graph Labels:
A, B

Text on Graph:
DISTRIBUTION A DEFINATELY BETTER THAN B ESPECIALLY AT LOW SPEEDS
DISTRIBUTION A EXCELLENT OVER WHOLE RANGE

Timing Diagram:
TDC 12°
Ex. 59°
IN 50°
013 CLCE

Axes Labels:
X-Axis: R P M
Y-Axis (Left): 20, 30, 40, 50, 60, 70, 80, 90, 100
Y-Axis (Right): B.M.E.P. [lb/sq in], 60, 70, 80, 90, 100, 110
  
  


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