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).
Comparison of wear on Spectre and Phantom tappets, referencing their different lubrication methods.
| Identifier | ExFiles\Box 96\2\ scan0019 | |
| Date | 18th January 1935 | |
| SECRET. X384 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from E/JNR.{Charles L. Jenner} E/JNR.{Charles L. Jenner}3/HP.18.1.35. SpectreCodename for Phantom III Tappets. If we compare the SpectreCodename for Phantom III tappets with the Phantom the wear on the contact faces can only be explained by the increase in rubbing speed, but on the other hand the SpectreCodename for Phantom III tappets run in an oil bath and the Phantom rely on splash from the connecting rods and crankshaft. For your information we have prepared the comparisons. ATT: E/JNR.{Charles L. Jenner} | ||