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).
Tests conducted to improve Phantom III oil consumption.
| Identifier | ExFiles\Box 144\3\ scan0211 | |
| Date | 11th May 1937 | |
| To Rm.{William Robotham - Chief Engineer} Phantom III oil Consumptions. We have carried out numerous tests to obtain a value for grummets, raised valve gear, and oil drains to the cylinder heads, with the object of improving Phantom III oil consumption. To obtain anything like consistant results we have found it necessary to clean the filters and use clean oil for each test. All our tests were carried out on Mobileil Arctic. The final conclusions arrived at are as follows :- (a) Metal shields are required to hold off the oil which drains from the rocker mechanism on to the valve springs. These shields together with the Valve gear raised .500 are worth from 80 to 85% of a possible 100%, below are the consumption figures in order of merit. (1) Standard without grummets .......... 228 M.P.G. (2) Raised valve gear with out grummets 400 M.P.G. (3) Raised valve gear with shields no grummets 914 M.P.G. (4) Raised Valve gear with shields and grummets. 1066 M.P.G. This is with standard clearance valves. (b) For cars in service where complaints are made shields should be used in conjunction with oil drain pipes, neither are effective when used separately, but used together give very satisfactory results. Mx.{John H Maddocks - Chief Proving Officer} has carried out a number of tests with cars running under these conditions. (c) It will be necessary to have shields of slightly different shape for use with drain pipes, to enable the oil to drain down the head quickly. Mx.{John H Maddocks - Chief Proving Officer} is testing this at the moment. Although at the moment we have no figures for shields with oil drain pipes Mx.{John H Maddocks - Chief Proving Officer} has tested this out with good results and we shall also be able to confirm this later. Rm{William Robotham - Chief Engineer}/F.Dodd. | ||