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 Grav-vac fuel systems on a 40/50HP engine.
| Identifier | ExFiles\Box 40\3\ Scan080 | |
| Date | 30th October 1928 | |
| INDUCTION PIPE DEPRESSION (INS. MERCURY) PETROL DELIVERY AT FULL THROTTLE. AUTOVAC AND GRAV-VAC 40/50HP ENGINE (R.H.25) PETROL RAISED 32". PETROL DELIVERY (PTS/HR) ENGINE R.P.M. AUTOVAC: -- -- GRAV-VAC: ------ Top X-Axis: 1.5, 1.9, 2.2, 2.5, 2.9, 3.1 Bottom X-Axis: 1250, 1500, 1750, 2000, 2250, 2500 Y-Axis: 50, 60, 70, 80, 90 Stamp: 30.10.28 | ||