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).
Experiment for a Phantom III camshaft with a reduced base circle to lower rubbing velocity.
| Identifier | ExFiles\Box 93\5\ scan0034 | |
| Date | 14th October 1936 | |
| 304 To EY. (struck through) Peiles Copy to EHC. (struck through) Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} E/PSN.1/MN.14.10.36. ----------------- SWDL{Len H. Swindell} Camshaft with Reduced Base Circle Diameter S Phantom III. We send you herewith LeC.5320 of a valve lift curve with the positive accelerations reduced to maintain a substantially flat sided flanked cam with the base circle reduced to .950" and the follower radius to 1.375". A preliminary layout of the cam indicates that the flank will be very slightly convex so that there will be no difficulty in grinding it on the Churchill machine. Details of the modifications necessary to the TAPPET mechanism will follow. The object of this experiment is to reduce the rubbing velocity between cam and tappet to the same as that on the Bentley and 25/30. E/PSN. Att: LeC.5320. E61099 Bullingdon spg | ||