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).
Performance and detonation tests on a Bentley unit with various ignition settings and fuels.
| Identifier | ExFiles\Box 83\2\ scan0133 | |
| Date | 11th November 1937 | |
| To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} c. Mx.{John H Maddocks - Chief Proving Officer} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. FD.{Frank Dodd - Bodies} c. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}8/MH.{M. Huckerby}11.11.37. 6.B.IV BENTLEY. UNIT.NO.B.24. Fitted with Deturbulated Cylinder Head and increased inlet ports, and Delco distributor. We have carried out the following tests on performance and detonation with various ignition settings and Fuels. (1) Performance figures over measured distances, accelerating from 10 m.p.h. in top gear, full throttle, shown as time in seconds. | Ignition Setting. | Fuel. | Units of distance. 1 unit = 55 yards. (Telegraph poles on Shardlow Straight) | |---|---|---|---|---|---|---| | | | 1. | 3. | 9. | 13. | 17. | | 5° Early. | Ethyl. | 7.1 | 13.6 | 26.1 | 32.8 | 38.9 | | T.D.C. | Ethyl. | 7.2 | 13.7 | 26.2 | 33.0 | 39.2 | | T.D.C. | Dominion. | 6.9 | 13.5 | 26.1 | 32.9 | 38.8 | | Mean of above three results | | 7.05 | 13.6 | 26.1 | 32.9 | 38.97 | | 5° Late. | Dominion. | 7.2 | 14.2 | 26.9 | 33.9 | 39.8 | | Difference between last two. | | 0.15 | 0.6 | 0.8 | 1.0 | 0.83 | | ||