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).
Valve mechanism noise caused by valve spring vibration.
| Identifier | ExFiles\Box 35\3\ scan 024 | |
| Date | 8th January 1921 | |
| K.R. 225A (100 T) (S. H.{Arthur M. Hanbury - Head Complaints} 705. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 X,2764. ns.{Norman Scott} from EP.{G. Eric Platford - Chief Quality Engineer} c. to BY? c. to Da.{Bernard Day - Chassis Design} EP{G. Eric Platford - Chief Quality Engineer}6/F8.1.21. X.2764 X.3777 Hm.{Capt. W. Hallam - Head Repairs} has brought to our attention certain valve mechanism noises which can be heard distinctly at higher engine speeds, which appear to be due to the vibration of the valve spring. The noise can be damped out by touching the spring while the engine is running. We have not experineced any serious trouble with valve breakages but I feel the above point is one which might receive our attention experimentally, as it would certainly be an advantage to eliminate the noise referred to. I should be pleased to make demonstrations of this noise on engines on test. EP.{G. Eric Platford - Chief Quality Engineer} | ||