Table of results for Autovac tests showing induction pipe depression on a 40/50 Silver Ghost.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan242 | |
| Date | 5th May 1923 | |
| AUTOVAC TESTS. TABLE 1. INDUCTION PIPE DEPRESSION. Table of results with Autovac on 40/50 Silver Ghost(1907 40/50 historic RAC 15,000 miles trial) - all readings at full throttle. | R.P.M. | Average engine demand pts/hr. | Autovac supply pts/hr.for different petrol levels. | | | | | | Induction pipe depressn inches water. | Suction on petrol. inches water. | |----------|-------------------------------|----------------------------------------------------|----------|----------|---------|---------|---------|---------------------------------------|--------------------------------| | | | CAR ON LEVEL. | | | | | | | | | | | Amount of petrol in tank. | | | | | | | | | | | FULL. | 3/4 FULL | 1/2 FULL | 11.85" | 1.85" | 1.85" | | | | | | Height fuel is raised. | | | | | | | | | | | 21.45" | 22.5" | 26.45" | 30.6" | 41" | 53" | | | |----------|-------------------------------|--------|----------|----------|---------|---------|---------|---------------------------------------|--------------------------------| | 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.mm. | | 751 | 751 | 753 | 761 | 751 | 758 | | | Figures marked + shew when Autovac will not supply engine requirements. N.B. The above figures are taken from the report Hs {Lord Ernest Hives - Chair} 3/LG9.5.23. | ||
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).