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).
Failures of split pins in the Eagle 8 valve gear and testing alternative solutions.
| Identifier | ExFiles\Box 36\1\ scan 135 | |
| Date | 18th September 1917 | |
| To R.{Sir Henry Royce} from EH. c. to BJ. c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} X.2925E/D EH2/LG18.9.17. X.3062 - EAGLE 8 VALVE GEAR X.3027 We notice on the valve test rig that the ends of the split pins tend to break off by their own inertia. The split pins as a rule have long ends and these can be seen jumping up and down when the camshaft is running. We consider that now the engine speeds have gone up, it would be better if we could avoid using split pins in the valves. We realize that the split pins on the old type valves are just as likely to break from inertia, but with the higher speed and quicker acceleration, the latest gear shows up to be worse. Shall we make a set with the Peugeot type of lock? We have a drawing of this. Valve Spring Washers X.2925E/D.{John DeLooze - Company Secretary} We have run a set of the latest type for 25 hours we have had no trouble with them. During the test, we have had to replace 3 split pins and one valve spring which was broken. EH. | ||