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).
Increase in oil pressure for B.60 & B.80 models by modifying the main oil pressure spring.
| Identifier | ExFiles\Box 124\1\ scan0142 | |
| Date | 7th June 1939 | |
| 10HH To By/CS. from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/MH.{M. Huckerby}7.6.39. B.60 & B.80 OIL PRESSURE. The existing main oil pressure spring gives an oil pressure of 30 lbs/sq.in. and to be on the safe side require this pressure to be 35 lbs/sq.in. We should therefore like you to draw out a stronger spring for the job and include this on the LOP. For your information, the requisite pressure can be obtained by stretching the existing spring E.88790 to 1.850" free length, which gives a loading of 4.5 lbs. at 1.000". Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||