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 comparing carburetter mixture control performance under throttled light loads at various engine speeds.
| Identifier | WestWitteringFiles\M\2Jan1925-March1925\ Scan30 | |
| Date | 17th December 1924 guessed | |
| No 2 METERING UNDER LIGHT LOADS. THROTTLED. BRAKE SET AT 2000 R.P.M. FULL LOAD. FOR EACH THROTTLE POSITION MIXTURE CONTROL IS ADJUSTED TO GIVE MAX. R.P.M. OF ENGINE. CARBURETTERS E.A.C. NOTE:- CURVES ABOVE THE ZERO LINE INDICATE A RICH MIXTURE AND CURVES BELOW THE LINE INDICATE WEAK MIXTURE. GRAPH ANNOTATIONS: AIR VALVE STARTS TO LIFT ON STD. E.A.C. & EXPL. E.A.C. STD. 40/50 CARB. AIR PORTS OPEN 40/50 & EXPL E.A.C. 40/50 AIR VALVE STARTS TO LIFT EXPERIMENTAL E.A.C. AIR PORTS OPEN STD E.A.C. STD. E.A.C. WITH 8 COIL SPG. RATING 38 OZ/IN. EXCESSIVE WEAK SPOT ON STD. E.A.C. CARBURETTER. Y-AXIS: Nº OF NOTCHES ON CONTROL TO OBTAIN CORRECT MIXTURE NOTCHES WEAK NOTCHES RICH X-AXIS: R.{Sir Henry Royce} P. M.{Mr Moon / Mr Moore} | ||