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).
Testing a 20 HP pump to eliminate chattering by modifying the low-pressure oil connection to mimic the Phantom pump's design.
| Identifier | ExFiles\Box 66a\4\ scan0026 | |
| Date | 1st January 1927 guessed | |
| contd :- -2- In the next test the low pressure union on the 20 HP. pump was blanked up completely and the intake union of the Phantom relief valve unit connected up to a point on the pump delivery pipe about 4" from the pump. The object of this was to approach more nearly the conditions existing in the Phantom pump. In the Phantom pump the delivery pipe is 'tapped' for low pressure oil some distance from the pump, whereas the 20 HP. low pressure oil is taken through a hole in the pump casing on the delivery side of the gears. The test was successful, no vibrations or chatter- ing were obtained indicating that the chattering was due to the pump pulsations. These must be very small and numerous and become evened out some distance from the pump to give a steady oil stream. The deductions are, that to be successful on the 20 HP. chassis, the relief valve should be fitted away from the pump, and the delivery pipe from the pump should be 'tapped' for low pressure oil (i.e. connection to relief valve) as far from the pump as is conveniently possible. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||