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 showing power loss from a PII carburetter air silencer on a Standard Car - 20 EX.
| Identifier | ExFiles\Box 102\1\ scan0057 | |
| Date | 23th November 1931 | |
| PII CARBURETTER AIR SILENCER POWER LOSS STANDARD CAR - 20 EX B.H.P. (CORRECTED) AT ROAD WHEELS CUT OUT OPEN CUT OUT CLOSED STANDARD CARB' AIR SILENCER AIR SILENCER OFF COMPLETE ALL INNER TUBES OUT OF AIR SILENCER (SPEEDS 2000 RPM UPWARDS IN 3RD GEAR) ENGINE R.P.M. | ||