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).
Outlining proposed tests on a Bentley lorry and other vehicles, focusing on bore wear, carburettors, and ignition.
| Identifier | ExFiles\Box 132\5\ scan0162 | |
| Date | 8th July 1941 | |
| To Hm{Capt. W. Hallam - Head Repairs}/Hvm. From Rm.{William Robotham - Chief Engineer} 1123 Rm.{William Robotham - Chief Engineer}9/ET.8.7.41. Confirming our conversation, we should like to measure the bore wear on the Bentley lorry as soon as opportunity occurs, and allow it to continue running with three oil holes in the connecting rods open, and three closed. We should also like the weight of the spare wheel cover for B.V. We should also like a pressure gauge on the car with the Buick steam valve. I also think that the most useful test on the large carburettors is to transfer them complete to 9.B., and see if 1 - The consumption is any better than the same car fitted with B.II carburettors. 2 - The flat spot in evidence at 30 M.P.H. has disappeared. If the carburation is good and the consumption satisfactory, they could be left on the car, to get an average figure for my normal driving. When the car has covered 1500 miles or so, a vacuum ignition advance could be fitted, to see if this makes any appreciable improvement. In the meantime, on a B.II, we could carry on with the small pipes and the B.II carburettors, to see if these pipes enable us to weaken off the mixture to a greater extent than normal pipes. When the big size pipe is fitted to 9.B., deterioration or otherwise in the idling should be carefully noted. Rm.{William Robotham - Chief Engineer} | ||