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).
Lightening valve gear to compensate for the extra weight of automatic tappets.
| Identifier | ExFiles\Box 88\4\ scan0078 | |
| Date | 3rd July 1934 | |
| -2- Hs{Lord Ernest Hives - Chair}/Smth.3/KW.3.7.34. It is hence obvious that attempts should be made to lighten the Valve gear so as to compensate as far as possible for the extra weight of the automatic tappets. The valves offer the greatest possibilities in this respect and it is suggested that they should be made hollow and the heads modelled on the Phantom inlet and the Kestrel exhaust valve EX.13145 respectively. The accompanying prints Hs.{Lord Ernest Hives - Chair}1450/1 indicate how this could be done. It is highly improbable that all the weight of the Halford tappets can be taken out of the valves, in which case the valve spring loadings will have to be increased if the present bouncing speed is to be restored. Thus with the suggested valves the maximum loadings will have to be increased to about 120 lbs. We are trying tubular push rods following the SpectreCodename for Phantom III design as one move offering possibilities. Hs{Lord Ernest Hives - Chair}/F.Ll.Smith. | ||