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).
Page 2 of a test report detailing experiments on engine oil pressure and circulation following imaginary rolls.
| Identifier | ExFiles\Box 179b\3\ img084 | |
| Date | 31th January 1933 | |
| -2- circulation - a Vickers Potts oil cooler being used to control the temperature. An air bleed was inserted in the oil feed pipe line to the engine 5 feet from, and 8" above, the pump inlet, and a control cock was arranged interconnected with the throttle so that air was admitted to the oil feed line when the throttle was closed and shut off when the throttle was open. In order to observe the movements of the oil supply, a length of glass tube was inserted in the supply pipe close to the pump. The above arrangement was found by experiment and gave a total time of approx. 40 secs. to regain oil pressure on opening up after the engine had been shut down to slow running for 10 secs. In order to check the pressure distribution in the gallery pipe, and also to see if any lag in pressure existed throughout the system, double ended banjo connections were fitted to the main bearing cap oil feeds, the second leg of the banjo being connected to an oil pipe which was taken through the crankcase wall and coupled to an oil pressure gauge. Tests Carried Out. Tests were carried out along the following lines :- (a) To observe the distribution of oil pressure throughout the gallery pipe. (i) To observe the effect of oil inlet temperature on the time taken to regain oil pressure. (ii) To observe the effect of the length of time of slow running on the time taken to regain oil pressure. (iii) To attempt to reproduce a failure by a number of imaginary rolls. Conditions of Test. For all load running a stop was arranged on the throttle at a setting which gave 472 BHP. at 2150 R.P.M. whilst the slow running speed was set to 500 R.P.M. When an imaginary roll was made the engine was run for a short time at 2150 R.P.M. with the air bleed cock interconnected with the throttle, which was then closed to slow running thereby opening the cock. After the predetermined period the throttle was again opened to | ||