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. | ||
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).