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).
Results of extended comparative tests on 'Fram' and 'General' oil reconditioner filters.
Identifier | ExFiles\Box 136\3\ scan0047 | |
Date | 31th May 1939 | |
1139 To Rm.{William Robotham - Chief Engineer} from HPS{Horace Percy Smith - Experimental Factory Mgr}/Bl. o.{Mr Oldham} to By.{R.W. Bailey - Chief Engineer} o.{Mr Oldham} to Da.{Bernard Day - Chassis Design} o.{Mr Oldham} to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} HPS{Horace Percy Smith - Experimental Factory Mgr}/Bl.1/CB.31.5.39. OIL RECONDITIONER TESTS. "General" & "Fram" Filters. Further to the tests reported on 1.11.38, it was decided to continue testing these two filters under the same conditions, i.e. 30 lb./sq. in. and 70°C, using a fresh supply of 2 gallons of dirty oil every 10 hours. "Fram" Filter. In addition to the 20 hours running reported, the test was continued for another 30 hours. The rate of cleaning slowed up considerably during the last 20 hours, being barely discernible at the end, although it had been very good earlier on. The rate of delivery remained fairly constant during the last 40 hours, the total drop throughout the tests being from 144 to 85 pts./hr. The maximum drop of 35 pts./hr. occurring in the second 10 hrs. as already reported. "General" Filter. This filter was tested in a similar manner to the "Fram", a further 40 hours testing being necessary, as only one supply of dirty oil had been used during the first 20 hours, as previously reported. The behaviour of this filter was very similar to the former, the rate of cleaning being good up to the last 20 hours. Although the cleaning was slow during the last 10 hours, dirt was definitely still being withdrawn from the oil. Delivery remained excellent during the last 40 hours, the total drop being from 102 to 75 pts./hr. It will be realised of course, that many more hours of running will be required under normal operating conditions to reach the point when the filter will have ended its useful life, as an exorbitant quantity of dirt was used during the tests. There is very little to choose between these two filters and all that can be said in conclusion is that both of them are a definite improvement on those previously tested. As before, samples of the oil are being tested on the A.C. oil sediment meter, and spot photographs taken. These results will be reported by Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} HPS{Horace Percy Smith - Experimental Factory Mgr}/Bl./RML. A.{Mr Adams} Bell | ||