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).
Crankshaft oiling schemes, comparing issues with Bentley engines to Phantom and Wraith models.
| Identifier | ExFiles\Box 85\5\ scan0074 | |
| Date | 9th October 1934 | |
| To Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} Crankshaft Oiling Schemes. I understand that greater trouble is had with big end bearings on the Bentley on those big ends (Nos. 2 and 5) which have an ungrooved intermediate bearing on either side of them than on those which have either the end or centre grooved main bearings to maintain a more continuous oil feed. I think that at the speeds at which we are now trying to run, and particularly bearing in mind that car oil pressures are rather low compared with the aero pressures, we ought to aim at a more continuous oil supply than one hole in the journal and one in the bush. On the Wraith we propose to use two side grooves as on the Phantom on all bearings, together with three oil holes in the journals. Here the intermediate and centre main bearings each have to feed two crankpins instead of vice-versa as on the Bentley. It would be useful if a Bentley could be built up with this scheme to get some experience of its effect on oil temperatures and consumption and the condition of bearings. E.{Mr Elliott - Chief Engineer} | ||