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).
Report comparing a B.W.P. suction device against a conventional system to reduce abrasive material in engine oil.
| Identifier | ExFiles\Box 135\3\ scan0082 | |
| Date | 25th October 1934 guessed | |
| 8. In an effort to further prove beyond a shadow of doubt that the reduction of the abrasive material in circulation in the oil during this initial breaking in period as accomplished by the B.W.P. Device produces a material improvement in the appearance of the bearings, a set up was made of a conventional crank shaft and block assembly. These bearings being fitted to the shaft to a clearance of .0015. They further at the time of assembly being as free as possible from any marks or scratches. Photograph No. 1 incorporated in this report illustrates the condition of the bearings at the time of assembly. These bearings were connected up to the oil pump and sump assembly which had been used on the above tests and operated in conjunction with the oil which had been charged with the sediment as described, both with the B.W.P. suction device and the conventional bell and screen assembly. Photograph No.2. illustrates the condition of the bearings after 1/2 hour of operation with the B.W.P. device installed. Photograph No. 3 illustrates the condition of the bearings when using the conventional suction assembly. It will be noted that the appearance of the bearings in the case of the B.W.P. installation is vastly superior to that obtained when using the conventional suction arrangement. It should be stated here that two sets of bearings were used for those two runs. One being used only in conjunction with the B.W.P. device and the other for the conventional suction system. Since it is obvious now that the B.W.P. suction device produces certain very definite improvements in the bearing conditions during initial breaking in of new engines it should be equally apparent that the continuation in operation of the B.W.P. device will during the course of the engine's operating life produce similar benefits. It is entirely reasonable to assume that since the B.W.P. device allows | ||