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 four different carburetor arrangements on a Phantom II engine with a 4.9 C/R aluminum head.
| Identifier | ExFiles\Box 102\1\ scan0020 | |
| Date | 8th July 1931 guessed | |
| Hs{Lord Ernest Hives - Chair} 411 COMPARISON OF VARIOUS CARB. ARRANGEMENTS P II 4.9 C/R ALUM HEAD. ① TWO S.U'S. PIPE ABOVE ② AS ① BUT PIPES JOINED TOGETHER CENTRALLY WITH THROUGH BORE. ③ TWIN RR CARB. 1.4 DIA. CHOKES ④ SINGLE CLAUDEL EAGLE IX CHOKE 1.8" DIA. ALL TESTS OPEN EXHAUST Y-AXIS LEFT: B.H.P. X-AXIS BOTTOM: ENGINE R.P.M. Y-AXIS RIGHT: INDUCTION DEPN INS Hg, B.M.E.P. VALVE TIMING DIAGRAM: EX 59 IN 65 17 13.4 RM.{William Robotham - Chief Engineer} 7731. | ||