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).
Analysis of power losses in an 8-cylinder engine for the Silver Phantom and considerations for a new Duplex Exhaust System.
| Identifier | ExFiles\Box 109\1\ scan0135 | |
| Date | 13th July 1939 | |
| 666 By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} c. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}9/R.13.7.39. "SILVER PHANTOM". Herewith further analysis on the losses of the 8-cylinder engine. When we build a Bentley fitted with this unit, we shall have to consider a Duplex Exhaust System. Wym.{G. Harold Whyman - Experimental Manager} is arranging to try one out on 11.B.V. in the immediate future. The R.R. 6-cylinder exhaust system fitted to the 8 is very quiet, but it will be seen that at 4,000 R.P.M. it absorbs no less than 45 horse-power. Wym.{G. Harold Whyman - Experimental Manager} is carrying out experiments to see if he can obtain a fair degree of silence while reducing the back pressure. Rm.{William Robotham - Chief Engineer} | ||