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 page detailing performance and testing of engine components like the carburetter, oil pump, and various filters.
| Identifier | ExFiles\Box 83\1\ scan0245 | |
| Date | 10th October 1936 guessed | |
| ( 6 ) The average petrol consumption since taking over from E was 13.3 m.p.g. and was in keeping with the driving conditions. CARBURETTER AIR SILENCER. LOP EB.2788. Existing, complete to above LOP - Standard Production. Effective in contributing to the high degree of general silence. OIL PUMP. LOP EB.2216 Arrgt. Ex.11955 Increased Capacity. Existing, complete to above LOP & Arrgt.incorporating;- Ex.11936 Casing. Ex.11937/8 Gears. LeC.4412 Relief Valve. EB.2393 Pump Cover. The pump was audible on occasions when first starting up, and examination showed that the pump gears had marked barrels on the suction side of the case. The thrust towards the suction side, due to the difference of the pressure on the two sides of the gears had taken up all the clearances allowed. This is a usual trouble. Oil pressure has remained good throughout the mileage in spite of the slack in the main bearings. The pressure during the final runs was 30 lbs/sq." at 70 MPH. The increased capacity of the pump is desirable and merited. OIL FILTER. LOP E.60112. Existing, complete to above LOP - Standard Production. This is the suction filter in the sump. Considerable quantities of metal passed straight through it into the oil pump when N° 6 big end failed. GAUZE PRESSURE FILTER. LOP E.87984 LeC.4692. Complete to above LOP - as standard production on Phantom III. This filter has been fitted experimentally with a view to standardising on the Bentley. No metal was found to have passed the pressure filter which contained a considerable quantity after the big end bearing failure. It saved the other bearings and in view of the comparative uselessness of the suction filter, it would seem to be an essential fitting. The filter had been examined at 5540 miles and found to be uniformly covered by a thick coating of black sludge. It was cleaned and the engine sump was drained and a fresh supply of Castrol "XL" added. During the rest of the running, no appreciable sludge collected on the filter. The filter should be always cleaned after the first 5000 miles, but afterwards it should not require any attention for intervals of 10.000 miles. | ||