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).
Blueprints for a PD.305 Exhaust Valve Spring for the B.60 Large Bore engine.
| Identifier | ExFiles\Box 123\5\ scan0167 | |
| Date | 16th November 1938 | |
| c. Rm.{William Robotham - Chief Engineer} ---------- Files B.60. LARGE BORE. Please receive herewith blueprints of PD.305 Exhaust Valve Spring for the above. This design is necessitated by the limitation on spring diameter imposed by the large bore. The loading is the same as with the present springs, which we know will run up to 4250 R.P.M. The stress and stress range are less than now. The drawing shews the modified exhaust port and guide, previously issued. The valve is similar to the salt cooled valve, but the length of stem and the position of the wedges is different. DA.{Bernard Day - Chassis Design} | ||