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).
Comparison of engine torque between Bentley and Wraith models.
| Identifier | ExFiles\Box 151\3\ scan0365 | |
| Date | 4th February 1938 | |
| -9- Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} 1/MU.4.2.38. COMPARISON OF ENGINE TORQUE BENTLEY AND WRAITH. | | BENTLEY | WRAITH. | |---|---|---| | Initial load required to turn engine. | 36 ft.lbs. | 54 ft.lbs. | | Load over compression | 50 " " | 39 " " | | Free Load | 18 " " | 18 " " | Engine Oil - Mobiloil rotic. Temperature 9°F. {Mr Friese} Cold chamber at 8°F. {Mr Friese} The clutch was not in operation as the Wraith unit used had not one fitted. | ||