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).
Procedures and timings for engine oil flow tests on different engine types.
| Identifier | ExFiles\Box 114\3\ scan0053 | |
| Date | 21th November 1938 | |
| Sr/VA. c. Hd.{Mr Hayward/Mr Huddy} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}18/C.21.11.38. RE: OIL FLOW TESTS. With reference to your memo Sr/VA.7/ETI.17.11.38. we have not at the present any flow figures to give you for an engine that has had a modification C.,for the simple reason that we have not had an engine in with a recurrent thump after a modification C. This feature we are on the look out for test figures, and we will let you have them in due course. There is another aspect which has to be borne in mind when testing the oil flow of Mod. B, and that is whether the connecting rods have the holes blocked up or not. If there is a very slight thump in the engine and the oil flow test shows to be on the minimum side, the question of the lubricating hole in the rod must be considered. Please note the following are the times established for the oil flow test up to date :- Old type 3 1/2 litre with white metal bearings. Doubtful condition 10 to 12 minutes. Bearings needing attention. 7 to 8 minutes. 4 1/4 Litre engine Halls metal. Doubtful condition - 4 minutes. Under 4 minutes, bearings need attention. (This is not with complete lubricating holes in crankshaft). Arctic Oil, must be used for oil flow tests, and crankcase must be 40°C at start of test. The bulb of the thermometer is placed in the crankcase filler. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||