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 petrol delivery at full throttle for Autovac and Gravvac systems on a 40/50HP engine.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan052 | |
| Date | 22th October 1924 | |
| INDUCTION PIPE DEPRESSION (INS. MERCURY) 1.5 1.9 2.2 2.5 2.9 3.4 PETROL DELIVERY AT FULL THROTTLE. AUTOVAC AND GRAV-VAC 40/50HP ENGINE (R=4.25) PETROL RAISED 32". PETROL DELIVERY (PTs/HR.) 90 80 60 50 ENGINE R.P.M. 1250 1500 1750 2000 2250 2500 Legend: AUTOVAC: --- GRAVVAC: ___ 22.X.24 | ||