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).
Table of test results for an Autovac system showing supply rates in pints per hour at full throttle under various RPM, fuel level, and gradient conditions.
| Identifier | ExFiles\Box 40\4\ Scan065 | |
| Date | 9th May 1923 guessed | |
| AUTOVAC TESTS. TABLE OF RESULTS WITH AUTOVAC ON 40/50 R.R. STANDARD CARBURETTER AND INDUCTION PIPE. All readings at full throttle. TABLE HEADERS (across multiple rows): Row 1: R.P.M. | Average engine demand. Pts/hr. | Autovac supply pts/hr. for different pet. levels. | Induction pipe depress-ion. Ins. water. | +++ Suction on petrol. Ins. water. Row 2: (blank) | (blank) | Car on level. | 1 in 6 grad. | 1 in 4 grad. | (blank) | (blank) Row 3: (blank) | (blank) | Amount of petrol in tank. Row 4: (blank) | (blank) | Height fuel is raised (H). Row 5: (blank) | (blank) | 21.45" | 22.5" | 26.45" | 30.6" | 41" | 53" Row 6: (blank) | (blank) | Full. | 3/4 full. | 1/2 full. | 1/4 full. | 1.85" | 1.85" TABLE DATA: (Columns: R.P.M., Avg. demand, Full, 3/4 full, 1/2 full, 1/4 full, 1 in 6 grad, 1 in 4 grad, Induc. depress., Suction petrol) 500 | 20.0 | 18.53 | 17.40 | 13.57 | 7.97 | O | O | 12.2 | 25.4 750 | 27.0 | 33.49 | 31.07 | 25.75 | 18.27 | 1.74 | O | 16.6 | 31.2 1000 | 34.5 | 45.06 | 42.19 | 36.54 | 29.58 | 17.12 | 2.89 | 21.9 | 40.1 1250 | 42.5 | 54.81 | 52.54 | 46.28 | 39.85 | 25.23 | 9.39 | 29.6 | 46.2 1500 | 49.0 | 63.77 | 62.64 | 57.59 | 48.72 | 35.67 | 22.62 | 37.3 | 54.4 1750 | 55.25 | 73.29 | 71.51 | 66.12 | 58.98 | 46.98 | 34.19 | 46.1 | 68.8 2000 | ---- | 79.78 | 77.43 | 72.21 | 66.99 | 54.80 | 41.76 | ---- | 92.0 Bar. m/m | ---- | (blank) | 751 | 753 | 761 | 751 | 758 +++ There is a non-return valve in the suction pipe so that the peak of the suction in the induction pipe is obtained. Red figures shew when Autovac will not s-upply full requirements. | ||