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).
Replacement of double valve springs with a single spring on the Phantom III valve gear.
| Identifier | ExFiles\Box 96\2\ scan0172 | |
| Date | 27th November 1936 | |
| Hives To H.{Arthur M. Hanbury - Head Complaints} E/PSN.3/MN.27.11.36. Copy to Rm.{William Robotham - Chief Engineer} Ba. E/JNR.{Charles L. Jenner} 354 FWJL Re Phantom III Valve Gear. With the deletion of the hydraulic tappet mechanism on the Phantom III valve gear, it should be possible to replace the double valve springs with a single spring similar to the Bentley. As it will probably be necessary to have a new and slightly heavier spring for the new shorter duration camshaft on the Bentley, we are designing the short duration Phantom III camshaft for use with the same spring. We feel that it is desirable to be able to use exactly the same valve springs on all our range of engines. E/PSN. | ||