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).
Outlining the procedure and objectives for oil tests on experimental cars.
| Identifier | ExFiles\Box 136\3\ scan0098 | |
| Date | 29th October 1940 | |
| Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} from Rm.{William Robotham - Chief Engineer} oil filters 1139 Rm.{William Robotham - Chief Engineer}13/ML.29.10.40. OIL TESTS - EXPERIMENTAL CARS. I have been looking at the results of the tests we have been carrying out on our cars; so far they have been rather haphazard because we have had no definite objective. We should like to proceed on the following lines from now onwards :- 12.B.V. It is now 15,00 miles since the filter element was changed and it has now run to a stabilised condition of cleanliness. The samples should be taken in a large test tube and the filter element changed at a speedometer reading of 30,200 miles. Samples should subsequently be taken in small test tubes every thousand miles and also blotting paper specimens. This is a test to see how a by-pass filter cleans up oil that is not very dirty, and how long it will take to do it. This part of the test has now been completed and we now want to see if the filter will keep the oil in it's present condition indefinitely if the element is changed every 5,000 miles. 9.B.V. We will make this car into a test to see how clean the oil keeps if the filter is changed every 4,000 miles. Take a large test tube sample and also blotting paper specimens, at 4,000 miles, change the filter element and take small test tube and blotting paper specimens every subsequent thousand miles, until the 4,000 miles have been completed, when the filter element should again be changed. 10.B.V. Make this a filter change every 5,000 miles and treat samples as 9.B.V. 2.B.50. Make this a filter change every 7,000 miles and treat samples as 9.B.V. - Continued - | ||