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).
Describing a valve lift indicator for testing Bentley and Phantom III engines.
| Identifier | ExFiles\Box 158\4\ scan0147 | |
| Date | 5th June 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} Copy to Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/Edwards. 1360 E/PSN/CDC.1/M.5.6.37. VALVE LIFT INDICATOR. We send you herewith LeC.5480 showing an indicator which is to be used for valve lift tests on the Bentley and Phantom III. The indicator has a reed mounted on the valve top washer and moving with it. This reed has a .005 slot in it, and corresponding slots in the sleeve controlled by the micrometer screw are adjusted until all three are in line, when the Neon tube lights up. The Neon tube circuit is connected to a S.C. contact breaker mounted on the engine and controlling another indicator on the camshaft recording camshaft angles. Schemes showing the latter arrangement have already been issued. From the figures of valve lift and camshaft angle obtained, the actual valve lift curve of the engine may be plotted. Scrap rocker covers should be used as they will have to be drilled to take the reeds. The base-plate for the Phantom III. scheme may be bolted down by the existing cap nuts, but the Bentley base-plate will have to extend over the whole rocker cover, and the top of the cover planed off to provide a base for the steel plate. It may be necessary to provide an oil seal of the type shown to prevent oil from obscuring the slot in the reed. An adjustable clamp has been provided so that the micrometer may be set to the nearest whole scale division before commencing each test, thus facilitating the taking of readings. (Cont'd) | ||