Comparative tests on the Wraith 28.G.VI using a standard Wraith induction system versus a Bentley III induction system.
| Identifier | ExFiles\Box 122\4\ scan0202 | |
| Date | 31th October 1938 | |
| To By. {R.W. Bailey - Chief Engineer} from Rm {William Robotham - Chief Engineer} /GR. {George Ratcliffe} c. to Hs. {Lord Ernest Hives - Chair} c. to Da. {Bernard Day - Chassis Design} c. to Mx. {John H Maddocks - Chief Proving Officer} c. to RM {William Robotham - Chief Engineer} /CTS. {C. Trot Salt - Carburation} Rm {William Robotham - Chief Engineer} /GR. {George Ratcliffe} 3/JH.31.10.38. Comparative tests on the Wraith 28.G.VI using (a) A standard Wraith induction system with single downdraught Stromberg carburetter. (b) The Bentley III induction system with two 1 1/2" horizontal S.U. carburetters and an automatic starter carburetter. Both sets of figures were obtained with the following ignition features - standard Wraith coil. R.R. distributor. Lodge Sytox 640 Plugs set at .030 gap. Immediately before running the tests the engine was decarbonised, valve seats recut and valves ground in. The usual acceleration figures of 10 to 30,40,50,60 M.P.H. were obtained, and from them an acceleration curve proper was deduced. Time and maximum speed up Ticknall Hill were recorded, a maximum speed test was run, and comparative petrol consumption figures were obtained at constant speeds with the Zenith. mile-age tester. Cont'd. {John DeLooze - Company Secretary} | ||
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).