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 comparison graph of a Semi Expanding carburettor versus a 5/8 inch S.U. carburettor on a turbulent head engine.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page243 | |
| Date | 29th November 1932 | |
| COMPARISON OF R.R. SEMI EXPANDING x 5/8" S.U. CARBURETTER RM{William Robotham - Chief Engineer} FR 37 TURBULENT HEAD 6.28 C/R 107° CAMSHAFT 1.2 DIA. INLET VALVES. OPEN EX. DYNO COUPLED DIRECT TO FLYWHEEL FLEXIBLE PISTONS LEC 3222 EX .020 IN 8 5 34 42 --- S.U. CARB. ___ SEMI EXPANDING CARB. BHP R.P.M. B.M.E.P. LBS/SQ." INDUCTION DEP'N INS. Hg 29.11.32 66 75 83 M.P.H. | ||