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 and dynamometer test results comparing different petrol filters.
| Identifier | ExFiles\Box 40\4\ Scan204 | |
| Date | 20th January 1927 guessed | |
| -4- AUTOVAC TESTS. Filter comparisons. Petrol delivery of by autovac at 1500 r.p.m. - engine full throttle opening. Petrol lifted 31 15/16" (equivalent to 6 galls. petrol in tank on a level road). Induction pipe depression (max:) 2.1" Hg. | Type of filter. | Time for flow of 1 pt.(secs.) | Flow pts/hr. | |-------------------------------------|-------------------------------|--------------| | Plain pipe 72" long. | 86.5 | 41.65 | | Standard filter. | 88.6 | 40.6 | | New type filter. | 97.6 | 36.8 | | New type filter, after modification.+ | 88.5 | 40.6 | + The modification to the new type filter consisted of opening all holes out to .3125" diameter. AUTOVAC TESTS - DYNAMOMETER. Comparison between original and modified new type filter. The following standard production dynamometer test was carried through on each type of filter. The petrol consumption was set at 52 pts/hr. full throttle at 1500 engine r.p.m. | Top gear. | Mins. | R.P.M. | | |-----------|-------|--------|---------| | " " | 10 | at 500 | contd :-| | " " | 10 | " 750 | | | " " | 10 | " 1000 | | | " " | 15 | " 1250 | | | " " | 10 | " 1500 | | | " " | 10 | " 1750 | | | " " | 10 | " 2000 | | | " " | 3 | " 2250 | | | " " | 3 | " 2500 | | | " " | 3 | " 2750 | | | ||