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).
Tests and results for a pump's performance, including endurance, flow, and suction tests.
| Identifier | ExFiles\Box 77\4\ scan0009 | |
| Date | 19th September 1918 guessed | |
| -3- 2. TESTS. The pump was fitted up with a flexible drive incorporating a right angle bend and run at various speeds. The following tests were made :- (a) 100 hour endurance test at 1200 r.p.m. (b) Flow tests against varying heads at 720, 950 and 1200 r.p.m. (c) Maximum suction lift at which pump is self priming and maximum head against which it will operate. (d) Test for direct feeding to carburetter against varying heads and with varying flow from carburetter to approximate actual operating conditions r.p.m. of 650, 950 and 1200 (e) Effect of tilting on valve operation. (f) Test when hand operated. (g) After 100 hours endurance run and when all tests were completed, delivery checked and pump examined to determine losses due to wear or deterioration. No altitude tests were made because of this pump being a positive type, will give constant delivery at all altitudes. 3. RESULTS (a) During the 100 hours endurance test the pump operated satisfactorily and showed no signs of failure. (b) Characteristics of flow tests are given on Fig. 1. herewith. It is to be noted that at high speeds and high heads (near to the maximum) the delivery falls off slightly, due to the spring being too weak to give the necessary acceleration to the plunger. (c) Maximum suction lift at which the pump is self priming is 3'3" which tallies with the results submitted by the makers. With the spring adjusted to the maximum, the lift at which flow ceased was 9'3" at 1200 r.p.m. and 9'8" at lower speeds (see Fig.1.) This lift could readily be increased by greater adjustment for the spring. (d) Results when feeding direct to the carburetter are tabulated in Table 1 herewith. The arrangement of apparatus is shown in Fig. 2. Contd. | ||