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).
Fuel pump delivery rates and maximum pressures under various test conditions.
| Identifier | ExFiles\Box 27a\2\ Scan243 | |
| Date | 4th September 1933 guessed | |
| -2- X. DELIVERY & MAX. PRESS. AS IN 'Y' WITH FLOAT CHAMBERS ATTACHED - FLOATS 'SUNK'. S.2: DELIVERY 110 Pts/Hr. Max. Press. 1.2 lb/sq.in S.3: " 120 " " " 2.0 " -------------------- * The max. pressures given, were recorded at the float chamber extremities of the delivery pipe with the flow completely stopped. SUMMARY OF OTHER TESTS. Using the shortest possible suction and delivery pipes - separate pipes for each pump - the maximum delivery obtained was 212 pts/hr., this result being obtained both when the joint delivery of the pumps was measured, and also when the delivery of each pump was taken, and the results added together. This did not apply when the complete suction and delivery pipes were attached. This in Test 'Y', S.3., the delivery with the two pumps working together was 140 pts/hr., whilst with each pump switched off in turn the deliveries were 94 pts/hr. and 90 pts/hr. giving a total delivery of 184 pts/hr., or 44 pts/hr. in excess of the combined delivery. Similar results were obtained (a) when very short suction pipes were used, the full delivery system being retained, and (b) when the conditions were reversed - i.e. full suction system, and short delivery pipes fitted. Probably by increasing the diameter of the pipes, or alternatively duplicating the systems, the difference between the individual, and the combined deliveries could have been reduced, but, up to this stage, the delivery springs only were considered in relation to a set installation. Except that the fabrics were set at 3 1/4 turns, no modifications were made to the setting determined by S.U. Then with the complete suction and delivery systems the relation between delivery and voltage was determined, it being found that 8 volts was the minimum at which the pumps would function; S.3. spring fitted. | ||