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).
Initial petrol pump timings, comparing different pump models and testing the effect of filter capacity.
| Identifier | ExFiles\Box 27a\2\ Scan160 | |
| Date | 11th May 1933 | |
| -2- being 4.3 lbs/sq.in. Thus, allowing for the 15% reduction due to the floatchambers (which were not the available) the quantity of petrol available at the jets was 120 pts/hr - Graph IV. Initial Pumping Time. Tested under the same conditions as the A.C. model "C" petrol pump (i.e. 12 ft. 1/4" diameter pipe line and straight delivery pipe), this pump was its equal as regards dry, slow speed pumping. INITIAL PUMPING TIME SECS. | PUMP SPEED R.P.M. | A.C. MODEL C. | R.R. Lec.3417 | |---|---|---| | 20 | 28 | 29 | | 50 | 13 | 12 | | 75 | 8 | 9 | With the full Bensport suction system, the initial pumping time was naturally increased. XXXXXXXXXXXXXXXXXXXXX Tests taken with the pipes run dry, and the filter emptied, when compared with the results obtained when the filter was not emptied, again demonstrated the effect of filter capacity on the initial pumping time at very slow speeds. The quantity of petrol remaining in the filter sump after running the system "dry" was roughly 35 c.c's. INITIAL PUMPING TIME SECS | PUMP SPEED R.P.M. | FILTER EMPTIED | FILTER NOT EMPTIED. | |---|---|---| | 20 | 55 | 45 | | 50 | 25 | 25 | | 75 | 20 | 20 | | ||