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).
Engine oil consumption at various speeds and proposed tests with an increased capacity oil pump to improve bore wear.
| Identifier | ExFiles\Box 132\4\ scan0110 | |
| Date | 19th October 1937 | |
| -18- RM{William Robotham - Chief Engineer}/Fths.S/IP.19.10.37. quantity of oil to lubricate the top ring as in the other case with the pressure kept constant at 25/lbs/sq.in. It will also be noticed that at low speeds the oil consumption is over 2000 miles/gall. although the engine was poor for consumption at high speeds, it can be imagined what the consumption at low speeds would be like if the engine gave a consumption of over 1000 miles/gall. at high speeds, hence the need for a greater supply of oil at low speeds with a consequent improvement in bore wear. In this direction we intend to carry out tests with an increased capacity oil pump having a large relief passage in order that pressure can be kept more constant over the whole speed range. We do not require more oil at high speeds as shown by the results of bore wear on 15,000 miles tests on which, wear is always exceptionally low. RM{William Robotham - Chief Engineer}/Fths. | ||