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 | ||