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 results for Autovac tests on a standard carburetter and induction pipe.
| Identifier | WestWitteringFiles\J\May1923\ Scan38 | |
| 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: Column 1: R.P.M. Column 2: Average engine demand. Pts/hr. Column 3 (Main): Autovac supply pts/hr. for different pet. levels. Sub-headers: - Car on level. | 1/8 grad. | 1/4 grad. - Amount of petrol in tank. - Full. | 3/4 full. | 1/2 full. | 1.85" | 1.85" | 1.85" - Height fuel is raised (H). - 21.45" | 22.5" | 26.45" | 30.6" | 41" | 53" Column 4: Induction pipe depression. Ins. water. Column 5: +++ Suction on petrol. Ins. water. TABLE DATA: (Format: R.P.M. | Demand | Supply values... | Depression | Suction) 500 | 20.0 | 18.53 | 17.40 | 13.57 | 7.97 | 0 | 0 | 12.2 | 25.4 750 | 27.0 | 33.49 | 31.07 | 25.75 | 18.27 | 1.74 | 0 | 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 FOOTNOTES: +++ 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. | ||