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).
Engine performance concerning oil pressure, slow running, water temperature, and timing gears.
| Identifier | ExFiles\Box 6\6\ 06-page231 | |
| Date | 2nd June 1937 | |
| - 5 - Rm{William Robotham - Chief Engineer}/Swd.1.1/VS.{J. Vickers}R2.6.37. Oil Pressure (Continued). starting cold. (1) The pressures were set as follows :- At 4000 R.P.M. with an oil inlet temperature of 100°C. Main Bearing 38 lbs/sq.in. Rocker Feed 5 lbs/sq.in. but at 250 R.P.M. idling with the temperature dropped to 65°C. the main pressure had dropped to 3 lbs/sq.in. (2) Removal of the restriction suction washer in the pump did not raise the hot idling figure. Starting cold with the washer removed did not produce a pressure in excess of 40 lbs/sq.in., even when opened up to 3000 R.P.M. (3) If we can run without the restriction washer there is less likelihood of pump noise when starting cold. Slow Running. (1) The idling with .006 tappet clearance is good and even at 250 R.P.M. no improvement affected by further increasing this clearance, thus reducing the overlap of the inlet opening and exhaust closing. (2) This shaft in effect is similar to that in wraith II No. 2. unit, which is to Ex.24263. Water Temperature. With the water pump now feeding into the rear end of the cylinder block, the water temperature is 6° lower at the rear than at the front. This will be further investigated. Timing Gears. Ra/FJH.{Fred J. Hardy - Chief Dev. Engineer} has issued a report on the gears, which were very noisy (whine). There was some error in the machining of the helix angle. continued. | ||