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).
Updates and design features for the Spectre Self-Adjusting Tappets.
| Identifier | ExFiles\Box 96\2\ scan0005 | |
| Date | 29th June 1934 | |
| [Handwritten top]: Rm{William Robotham - Chief Engineer} x357 SWDC To BY.{R.W. Bailey - Chief Engineer} from E/JNR.{Charles L. Jenner} E/JNR.{Charles L. Jenner}6/HP.29.6.34. c. Hs.{Lord Ernest Hives - Chair} RHC.{R. H. Coverley - Production Engineer} re SpectreCodename for Phantom III Self-Adjusting Tappets. We have been over the above and brought the device right up to date incorporating the following features on LeC.4012, herewith. The oil supply scheme has been made similar to the latest Phantom. The ball valve seatings have been made spherical instead of straight edged, permitting the ball valve movement to be .006 to .009. We have called for the rocker shaft to be made in S/ZN hardened and ground. Springs are used to separate the rockers instead of distance pieces. We want white metal lined eccentrics with .001 diametrical clearance on rocker shaft. In regard to the oil filter, this is being dealt with separately, and we are hoping to embody this in one of the engine arms. A non return valve already exists in the relief valve. Will you please incorporate these features on the second SpectreCodename for Phantom III engine. [Handwritten bottom right]: Do you agree with this? E/JNR.{Charles L. Jenner} P.T.O Rm{William Robotham - Chief Engineer} Drawing to BY.{R.W. Bailey - Chief Engineer} Print to RHC.{R. H. Coverley - Production Engineer} | ||