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).
Clutch case and crankcase pressure tests for a 3.S.I. Spectre model regarding an over-oiling issue.
| Identifier | ExFiles\Box 91\4\ scan0056 | |
| Date | 1st July 1935 | |
| X300 a HOTEL DE FRANCE. CHATEAUROUX. Indre. France. GWH{George W. Hancock - Head Chateauroux}/JAB. Ist July 1935. ARM. To. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From. G.W.H. 3.S.I. SPECTRECodename for Phantom III. We have received your memo. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} IO/KW of 29/6/35. We note your remarks re over-oiling. We have not as yet tackled the job. We have been carrying out tests to-day, to determine our Clutch case pressure and Crankcase pressure. We are at a loss to know, how the 6" water pressure was obtained. The position the pressure is taken, makes a lot of difference. We have taken our pressures behind the Flywheel as near to the bearing as it was possible to get. The following are the pressures obtained. ( Average of three tests) Speed. Clutch cover on Cover off. 1/2 of a M.P.H. with large slot. cover fitted to left side 20 0.2 0.1 " water 0.2 0.1 " 0.2 0.1 " 30 0.50 0.25 " 0.4 0.2 " 0.50 0.25 " 40 0.90 0.45 " 0.6 0.3 " 0.90 0.45 " 50 1.50 0.75 " 1.10 0.55 " 1.40 0.70 " 60 2.20 1.10 " 1.90 0.85 " 1.90 0.95 " 70 2.90 1.45 " 2.30 1.15 " 2.50 1.25 " 80 3.50 1.75 " 2.90 1.45 " 3.12 1.6 " The Crankcase pressure is as follows. | ||