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).
Carburetion tests comparing .055' and .052' jets to address a flat spot issue on light throttle.
| Identifier | ExFiles\Box 109\4\ scan0184 | |
| Date | 5th August 1939 | |
| 666a. To. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} c. Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe} c. Rm{William Robotham - Chief Engineer}/GTS. CHATEAUROUX. 5/5.8.39. 30.G.VII. CARBURATION. We have found that to completely overcome the flat spot on light throttle at 28 m.p.h. it is necessary to fit .055" jets. These are however far too rich in all other respects and give worse timed acceleration figures than the .052" jets on which we are running. M.P.H. .055" Jets .052" Jets. 10 - 30 7.9 secs 7.4 secs. 10 - 40 11.8 " 11.0 " 10 - 50 15.8 " 14.8 " It would appear that the trouble is more fundamental and possibly due to the incorrect placing or size of the air bleed holes in the emulsion tubes. ------------ Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} | ||