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).
Comparative analysis of different pump types, including various Bijur models, detailing their pumping capacities, efficiency, and bore/stroke ratios.
| Identifier | ExFiles\Box 27\1\ Scan050 | |
| Date | 2nd January 1929 guessed | |
| contd :- -2- TYPE OF PUMP. Designed to pump. ccs. Pumping. (Not connected up). Mob.BB. ccs. Cast:P3. ccs. Mot.C. ccs. Bijur M.H. ccs. (1) RR.Bijur (Fig.2. N.Sch.2736) 12 8.2 8.5 8.5 7.3 (2) Hand pump Bijur. -- 14.3 14.6 14.0 13.6 (3) RR.Bijur (Fig.1. N.Sch.2736) 10.85 9.9 9.5 10.5 9.0 (4) Latest foot pump Bijur. 23.2 22.0 21.5 22.0 21.5 (5) Spring controlled valve. RR.Bijur(experimental.) 10.85 9.9 10.0 9.8 9.75 We have not yet obtained an efficiency of 50% connected up with our own pump, but a comparison with the large capacity Bijur is not quite fair, as the loss of 1 cc. on our own pump means 10% per stroke, and three strokes are necessary to to make reasonable calculations. The loss of 1 cc. on the Bijur is something under .5%. Owing to the high pressure in the pump and the slow nature of the return of the plunger, it is unreasonable to expect oil not to be forced back past the leather washers. Provided the capacity allows for this there should be no trouble from this source under actual working conditions. BORE AND STROKE. The bore/stroke ratio on the Bijur is 1.5"/.8" = 1.875 Our present " " " is 1.25"/.7" = 1.788 contd ; | ||