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).
Typed memo discussing the rate of cylinder bore wear and test plans for 3' bore engines.
| Identifier | ExFiles\Box 132\5\ scan0167 | |
| Date | 8th February 1944 | |
| To: FJH{Fred J. Hardy - Chief Dev. Engineer}/CTS{C. Trot Salt - Carburation} from Rm.{William Robotham - Chief Engineer} c. to Wym.{G. Harold Whyman - Experimental Manager} c. to Jnr.{Charles L. Jenner} 1123 Rm.{William Robotham - Chief Engineer} 6/h.{Arthur M. Hanbury - Head Complaints} 8.2.44. RATE OF CYLINDER BORE WEAR. Referring to your FJH{Fred J. Hardy - Chief Dev. Engineer}/CTS.{C. Trot Salt - Carburation} 1/HM.{Capt. W. Hallam - Head Repairs} 3.2.44. I agree that 3¼" bore engines are really not too bad for bore wear. I think it more than probable that close bearing clearances have some effect on the result obtained on the 3" bore engines. I believe that mains can affect the amount of oil on the bore as well as big ends. Unless I am mistaken, 30 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} VII. had a phenomenal oil consumption when the Vandervell bearings were first fitted to the main bearings. I think our object should be to run the 3" bore 4-cylinder on the test-bed at 3000 revs. and adjust bearing clearances, oil pressure or what-have-you until its oil consumption at this stage is two-thirds that of B.60. We can then run it on the road and if the bore wear becomes normal, we can chromium plate, knowing that we are not likely to suffer from piston seizure or scuffing due to dry bores. Rm.{William Robotham - Chief Engineer} | ||