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).
Weight of the Bentley 50 Cylinder & Crankcase in comparison to Chevrolet and Oldsmobile components.
| Identifier | ExFiles\Box 142\4\ scan0108 | |
| Date | 31th May 1938 | |
| 1202 RHC{R. H. Coverley - Production Engineer}/Vs.{J. Vickers} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}5/R.31.5.38. re: Bentley 50 Cylinder & Crankcase. Thank you for your note. We should have thought your figure was on the low side since the weight of the Chevrolet block and crankcase, which has no valves in it, and is a smaller engine, is 142 lbs, and the weight of the Oldsmobile, which has a side valve block of the same type, is 193 lbs. Both these engines are 4-bearing. We do not know, of course, to what section they manage to work. We are writing a special note to Walker asking him to keep the average section set to .175, and are looking to him to see that the patterns are kept down to this. Rm.{William Robotham - Chief Engineer} | ||