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 test results for a 6.B.IV Bentley unit with a Deturbulated Cylinder Head.
| Identifier | ExFiles\Box 168a\4\ img049 | |
| Date | 11th November 1937 | |
| To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} To:- O.T. Mr. O.{Mr Oldham} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} O.{Mr Oldham} FD.{Frank Dodd - Bodies} O.{Mr Oldham} Rm{William Robotham - Chief Engineer}/RC.{R. Childs} 6144 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 | 33.9 | 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 | | ||