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).
Change of steel for exhaust valves and the resulting scrap costs.
| Identifier | ExFiles\Box 52\2\ Scan219 | |
| Date | 8th April 1930 | |
| BY - from SFT. {Mr Swift} c. Hoz. c. Hs. {Lord Ernest Hives - Chair} c. ROY. {Sir Henry Royce} X4429 SFT. {Mr Swift} 4/B.8.4.30. X4429 x7230 x5230. Exhaust Valves. ------------- With reference to memo BY16/N.7.4.30. instructing us that we should revert to S.L.V. steel in place of H.R.Crown steel for exhaust valves on both types of cars, please note we can introduce the exhaust valves of S.L.V. in three weeks time on the Phantom II, and in four weeks time on the 20/25.HP. I must point out however, that this will involve scrap as follows:- E.79737. Phantom II Valves in H.R. crown steel and fully machined and part machined......£135. E.55559. 20/25.HP. Valves in H.R. crown steel fully machined and part machined......£201. Total of ..................£336. In addition to which I understand there are in stock some lengths of 1" and 1-3/8" bar, representing steel of approximate value of £550. In the meantime we have immediately stopped work on the H.R. crown and are pushing on as quickly as possible the production of valves from S.L.V. steel in accordance with the instructions contained in your memo. SFT. {Mr Swift} | ||