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).
Experiments modifying a standard petrol pump in stages to increase its output, with a summary of test results.
| Identifier | ExFiles\Box 17\5\ Scan099 | |
| Date | 13th November 1931 | |
| To R.{Sir Henry Royce} from Ha/Rm.{William Robotham - Chief Engineer} c. SG.{Arthur F. Sidgreaves - MD} c. WOr.{Arthur Wormald - General Works Manager} c. E.{Mr Elliott - Chief Engineer} c. Dm.{D. Munro} c. Hy.{Tom Haldenby - Plant Engineer} Ha/Rml/MS13.11.31. P.II. Petrol Pump. Lec 2907/9. 27-EX. Standard Pump modified in Stages. During the previous series of experiments, made with a view to increasing the output of this type of petrol pump, several modifications were made at the same time - between tests - in an attempt to arrive at a fairly rapid solution. With the standard pump taken from 27-EX, the modifications were made in stages, a separate test being taken after each alteration. Except in the case of the "air bottle" and "reservoir" tests, each modification was supplementary to the previous alterations. As in the previous experiments, the deliveries obtained, did not bear any definite relation to the pump speeds, making the definite determination of the results difficult, and the following remarks refer only to the deliveries between 1000 and 2000 R.P.M. pump speeds. SUMMARY OF RESULTS The pump was first tested in its standard form - Test 1. Fitting pin type stops, and hexagon valves had very little marked effect - Test 2. The standard springs (Upper 3 1/2 lb. lower 10 lb), replaced by stronger (Upper 8 lb. lower 20 lb) springs gave an increase of 15 to 20 pts/hr - Test 3, but contrary to expectations, the addition of a 25 cc "reservoir" made little or no material improvement - Test 4. A 100 cc "reservoir" gave approximately 20 pts/hr. further increased delivery at 1000 R.P.M. but this was gradually lost up to 2000 R.P.M. - Test 5. This "tail" effect was also obtained when using a 100 cc "air bottle" - Test 6. Both these tests (5 & 6) were taken with diaphragm fabrics having 2.800" CTS{C. Trot Salt - Carburation} bolt holes, but several results obtained with 2.700" CTS{C. Trot Salt - Carburation} fabrics in Test 6 showed very little difference in delivery. The 2.700" CTS{C. Trot Salt - Carburation} fabrics were retained in all further tests, since they are standard. Except that the reduction in delivery with increased speed was not as great as in previous tests, the reduction of the capacity of the air "bottle" from continued. | ||