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).
Test bed report on the efficiency of an A.C. oil filter when used on a 4 1/4 Litre Bentley engine.
| Identifier | ExFiles\Box 135\3\ scan0142 | |
| Date | 20th April 1937 | |
| 1139 Files A.C. OIL FILTER - TEST BED REPORT. Part under test. A.C.Oil Filter. Purpose of Test. To determine the efficiency of this filter when used on a 4 1/4 Litre Bentley engine. Condition of Test. A tapping was taken from the main pressure supply, through the A.C. filter back into the rocker feed supply. Method of Test. The filter was fitted to B.17 unit in the above manner. This engine had A.C.6. mains. 3.AC.65 and 3.AC.55 big ends. High speed endurance was carried out as follows:- 30 mins at 4000 R.P.M. } 25 " " 4250 " } In everyhour. 5 " " 4500 " } After running 10 hours full throttle as above, a sample of oil was analysed (Motorine C.) A test was then run on B.18 unit, in the same way in every respect, but no A.C. filter was fitted. This engine had Vandervell bearings on a narrow pin crank. After running 10 hours full throttle a sample of oil was analysed (Motorine C.) Result We give below copy of Lab. report. ---------------- Laboratory Report No.L.4263. Re. Two samples of used oil (1) circulated with A.C. filter. (2) Without A.C.Filter. The above samples have been examined for impurities with the following results:- With A.C.Filter Without A.C.Filter Ash on Ignition (Chiefly 0.034% 0.098% Iron) Carbon (Approx.) .05% .05% Moisture. .3% .3% The material used as a filtering medium in the above filter is mainly slag wool. Hl. | ||