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 three different carburetter configurations, plotting horsepower and pressure against engine RPM.
| Identifier | Morton\M13.2\ img102 | |
| Date | 19th August 1931 | |
| RM.{William Robotham - Chief Engineer} 28 19/8/31 CARBURETTER COMPARISON ON CHINA 5-1 C/R HIGH OUTPUT COIL. NO. 'O' SHAFT ① --- S.U CARB 1 5/8 THROTTLE DIA ② ---- SOLEX CARB 1 5/8 THROTTLE DIA 29 M.M. CHOKE ③ - - - STD 1 5/8 LARGER R.R. 1 1/2 THROTTLE DIA B.H.P. 80 70 60 50 40 30 20 10 R.P.M. 500 1000 1500 2000 2500 3000 3500 B.M.E.P. IND. DEPN. INS. HG. 110 100 90 80 70 60 5 4 3 2 | ||