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).
Oil pump tests for Bentley, detailing performance with different gears and casings.
| Identifier | ExFiles\Box 149\2\ scan0141 | |
| Date | 12th February 1937 | |
| E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe} c. to Mx.{John H Maddocks - Chief Proving Officer} 12/v/s Rml/R.12.2.37. REPORT ON OIL PUMP TESTS (BENTLEY) Tests carried out on B.23.AE & 5.B.IV. B.23.AE crankcase sump had a baffle fitted over the front end of the centre section. This was tested on the road, and compared with 5.B.IV. as standard, without the Baffle, as a further check. The results showed no difference to the priming of the pumps. The baffle was then left intact in the sump throughout the whole series of tests. All pumps were of large capacity, and adjusted for the same pressures, at an average road temperature with Mobiloil "Arctic". Pressure @ 2,000 R.P.M. - 25 lbs square inch. " @ 3,000 " - 31 " " " " @ 4,000 " - 38 " " " All pumps had a BZ/C metal floor. Aluminium casings had the ball release valve. Brass casings had the fluted poppet type of release valve. (1) 22° Helical gears in Aluminium casing. Test A.{Mr Adams} Braking hard stop from 70 M.P.H., 30 secs.@ 1000 R.P.M. Pressure O.K. on a 3 1/2 in 1 gradient; up and down; stop & start. Gears very quiet. Test B. Oil drained and replaced; pressure registered from start after 25 secs. (2) 10° Helical gears in Aluminium casing. Test A.{Mr Adams} 70 M.P.H. 17 secs. @ 1000 R.P.M. Gears quiet, faint rattle @ 1000/1500 R.P.M. | ||