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).
Description of a test simulating engine break-in to evaluate the effect of foreign particles and a specific B.W.P. suction device.
| Identifier | ExFiles\Box 135\3\ scan0078 | |
| Date | 25th October 1934 guessed | |
| 4. DESCRIPTION OF TEST No. 2. Equipment Same as in test No. 1. As stated above this test was outlined to simulate the operation of a new engine coming off the assembly line into the manufacturer's engine test department. The disagreeable fact that cast iron particles, core sand, babbit and various other foreign elements are dislodged by the washing action of hot oil from the major component parts of a new engine during the process of breaking in is generally known to automotive engineers. This in spite of the fact that every possible effort on the part of the manufacturing divisions have been carried out to rid the various parts of the engine of dirt and foreign elements during the process of assembly. It is not uncommon to find a disconcerting collection of the above undesirable elements in the sump after the engine has been broken in. It was our belief that the suction level from which the B.W.P. device draws its oil would result in a much cleaner lubricant being forced through the bearings. Our test was carried out in an effort to prove or refute this contention. The following sediments were prepared, thoroughly mixed and sifted onto the sub-trays of the sump over a period of 1/2 hour during which time the pump was delivering oil in the conventional manner, using the B.W.P. suction device. 36.9 C. C. cast iron hack saw particles, 11 C. C. of fine file babbit particles, 11 C.C. of fine brass particles, 14 C. C. core sand Making a total of 72.9 C.C. of sediment and a percentage of .965%. | ||