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).
Flexible engine mounting tests on the 20/25 and Bentley models.
| Identifier | ExFiles\Box 104\1\ scan0224 | |
| Date | 10th October 1934 | |
| X5813 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c to Wde c to By.{R.W. Bailey - Chief Engineer} Flexible Engine Mounting. Hancock's tests in France suggested that we were not making the best of the rubber mounting on the 20/25. We therefore carried out tests to prove the point. The results indicate that the two cars do require different treatment, we cannot have torque reaction dampers on the 20/25 without losing engine smoothness. On the Bentley I am satisfied that with a high compression head we gain more from having torque reaction dampers than on the 20/25 because the engine tends to move about more in the chassis when letting the clutch in. Furthermore we do not lose so much at higher speeds as the Bentley engine is fundamentally rougher. The clutch trouble has resolved itself into the fact that with a link between the cantilever pedal shaft and the engine and the pedal shaft free to follow the link, we are completely free from clutch jagger. Any stays therefore which we may have to fit will only be to keep the engine still when the brakes are being applied. We are making tests to find out just what is required for this particular result. Attached is a summary by Whyman of the various tests he has been carrying out. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||