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).
Programme of test bed work for the Wraith III No. 2 unit, detailing tests to address oil leaks and evaluate induction and exhaust systems.
| Identifier | ExFiles\Box 155\2\ scan0148 | |
| Date | 15th September 1937 | |
| 1315 To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. Rm{William Robotham - Chief Engineer}/OTS. c. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} Programme of Test Bed Work Further to our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/MH.{M. Huckerby}).9.37. No.30. Test Bed Wraith III. No.2. Unit. (1) Test out the new improved quality felts with increased width of face to see if oil leak into the clutch pit is cured. (2) If leak still persists try with retainer web cut away and we might try oil release holes back into the crankcase. (3) Working in with tests to overcome oil leak into the clutch pit, distribution tests to be carried out as follows:- (a) Can anything be done with existing induction system to prevent bias in distribution due to the air intake and bend.? An extension piece protruding into the hot box might be tried which should reduce any bias effect. (b) Trial of the extra and opposite choke support arm in the carburetter body. (c) Trial of reduced 1.400 bore induction system. The above tests to be carried out with standard exhaust silencer. C.17. Until the bed is altered for Wraith the following tests to be carried out with view to seeing what effect exhaust valve timing and duration has on final power. (1) Power curves open exhaust and with standard silencer to find the effect of the exhaust valve timing and duration on the ultimate power. (a) With existing std. camshaft, at normal timing, 1 tooth early and 1 tooth late. | ||