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).
Endurance test detailing oil system modifications and an ignition system replacement.
| Identifier | ExFiles\Box 85\5\ scan0072 | |
| Date | 29th August 1934 guessed | |
| -2- The bearings were not damaged by the failure of the oil supply so that by replacing the Gallery Pipe the test was continued. The new gallery pipe was fitted having silver soldered joints instead of the usual soft solder. At the same time that the gallery pipe was fitted a larger oil pump was fitted in order to increase the total flow of oil. With the standard pump and narrow width Big End Bearings in Lead Bronze which had increased clearance from the standard for white metal there was naturally not the same restriction to the oil flow and in consequence the main oil pressure was lower than normal, being only 27lbs/sq.in. and the engine gears and valve mechanism had much less oil than usual. After fitting the larger pump the main pressure increased to 40 lbs/sq.in. The unit completed the 10 hours Endurance without any further trouble. The total oil consumed on the Endurance run was 28 pints giving an oil consumption rate of 2.8 pts/hour. After the Endurance run the engine gears had improved considerably, there being only a slight "whine" and no rattles whatever. The half torsional period was found to be at 2660 r.p.m. giving a top Torsional Period of 5320 r.p.m. The unit was originally fitted with Delco-Remy Ignition System, but owing to a very bad oil leak from the base of the distributor this was removed after the first hour of the endurance test and standard distributor fitted. Hs{Lord Ernest Hives - Chair}/R.Matthews. | ||