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).
Autovac tests measuring the effect of restriction in the petrol line on petrol delivery under various conditions.
| Identifier | ExFiles\Box 40\4\ Scan203 | |
| Date | 20th January 1927 guessed | |
| -3- AUTOVAC TESTS. Tests to show that the effect of restriction in the petrol line from tank to autovac is more apparent when a small amount of petrol is being lifted than when the flow is comparatively large. (1) Petrol lifted through 31 15/16". Engine r.p.m. 1500. Full throttle. Induction pipe depression 1.9" Hg. | Condition of test. | Petrol delivery. | |-----------------------------------------------------------------------------------|-------------------------|-------------------| | | Time for 1 pt. secs. | Flow. pts/hr. | | Petrol sucked through a plain pipe 72" long. | 69.7 | 51.7 | | Original new type filter added to plain pipe, holes A.{Mr Adams} .250" dia. Hole B. .3125" dia. | 77.4 | 46.6 | | New type filter with all holes opened out to .3125" dia. | 73.6 | 48.9 | (2) As (1) but throttle opening to give 7.5" Hg. Induction pipe depression. | Petrol sucked through a plain pipe 72" long. | 38 | 94.9 | |------------------------------------------------------------------------------|------|------| | New type filter added to pipe. Holes A.{Mr Adams} .250" dia. Holes B. .3125" dia. | 40.1 | 89.8 | | New type filter added to pipe but all holes opened to .3125" dia. | 38.8 | 92.9 | contd :- | ||