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 issues and observations on a carburetter air silencer, fan, ignition, and flywheel/clutch assemblies.
| Identifier | ExFiles\Box 101\2\ scan0045 | |
| Date | 20th July 1936 guessed | |
| ( 5 ) CARBURETTER AIR SILENCER. LOP E.60740 Complete to above LOP EX C.16 unit. The silencer effectively quietens the intake, and there has been no signs of air filter becoming blocked. The flange for the valve rocker box connection came loose on its rivets, & a considerable quantity of oil came out at this point. There were also general oil leaks from the connecting pipe to the rocker box. A grey mixture of oil and aluminium dust came from the point where the inlet pipe leaves the air silencer, and from the rivets of the support brackets. We are continuing our running with the breather pipe to the rocker cover removed, as none of these troubles would be apparent if oil was not drawn into the air silencer. We do not see the reason for fitting the universal joint with the large nut and looking ring on the pipe to the carburetter intake, as this is never loosened off when the pipe is removed. FAN LOP. E.60391. Complete to above LOP Ex. C.16 unit. The outer fan blade rivets have worked loose. This has occurred previously during the running in England. IGNITION. K.L.G. 850 plugs with increased gas volume and set at .035" were fitted at 15,000 miles. These gave good results for 4,500 miles when misfiring occurred. The insulation of the plug leads had collapsed but a blue discharge was also visible down the mica plug insulators. After 6,500 miles, the central electrodes had burnt and the gaps had increased to .040". The advantage of the wide gaps was very slight, & the greater strain put upon the insulation, increases the possibility of breakdown. At high speeds power did not immediately fall off when the ignition was switched off. FLYWHEEL & CLUTCH. LOP G.57097. Complete to above LOP incorporating :- Borg & Beck Clutch 11.A.3. No 26 Ex C.16 unit. Ransome & Marles LJ.25.Z. Bearing Ex. C.16 unit. G.57085 Flywheel. The clutch is free from slip & light in operation. There is no indication of wear having taken place in the linings. The engagement is smooth except for slight transmission rattle starting from rest experienced on one or two occasions. The propellor shaft damper has been in use through-out the French mileage. At the end of the running it was removed and transmission rattle was then very much in evidence on starting from rest. It was then replaced & the take up was again smooth. [Handwritten notes in left margin:] Report from G.W.H. Wym.{G. Harold Whyman - Experimental Manager} Get By.{R.W. Bailey - Chief Engineer} to remove and save cost. Rm.{William Robotham - Chief Engineer} O.R. [Signature] Std. Serious - what about this Rm.{William Robotham - Chief Engineer} | ||