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).
From Mr. Royce discussing the oil relief system for the 'Vulture' engine, focusing on oil pressure and relief pipe sizing.
| Identifier | ExFiles\Box 74\4\ scan0055 | |
| Date | 1st November 1920 | |
| To Hs.{Lord Ernest Hives - Chair} from E' c. to CJ. c. to Da.{Bernard Day - Chassis Design} c. to EFC. *4103 X3548 47 E3/G3.11.20. X.4103. RE OIL RELIEF SYSTEM FOR "VULTURE" ENGINE. In connection with the question of the excessive pressure in the oil system generated by the pump when starting up a cold engine, Mr. Royce points out that some limit of this pressure is wlays provided by the resistance of the oil suction pipe to the pump, that is to say, if the oil is so thick due to the low temperature that it will not escaoe easily through the engine, then it will have similar difficulty in getting into the pump at all through the suction side of the system. If this is so, then it is not necessary to have a relief valve and passage of very large area for when the engine is cold, and it remains to be seen what is the smallest size that can be used when the engine is at normal temperature. Mr. Royce would like you to find out what size of pipe connected to the main oil delivery will relieve the oil pressure when the engine is running fast. E.{Mr Elliott - Chief Engineer} | ||