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).
Graph of power curves for a Phantom engine with a Solex twin carburetter, comparing different choke sizes.
| Identifier | ExFiles\Box 121\2\ scan0072 | |
| Date | 30th January 1929 | |
| POWER CURVES WITH SOLEX TWIN CARBURETTER ON PHANTOM. ONE CHOKE SUPPLIES THREE CYLINDERS 34 M/M CHOKE GIVES 1.055□" FREE AREA 32 M/M " " .893□" " " B.H.P ENG. R.P.M. SOLEX 34 M/M CHOKES SOLEX 32 M/M CHOKES STD PHANTOM CARBS. AEJ 30/1/29 | ||