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).
Various alloys for casting engine parts, their properties, and pricing.
| Identifier | ExFiles\Box 142\4\ scan0036 | |
| Date | 20th November 1936 | |
| -3- 20.11.36. L.5. Virgin. £89 per ton. This is the standard crankcase alloy for both sand and die castings, and is the alloy in which we are proposing to try all our parts which are at present made in RR.50., which are not subjected to contact with water. No.6. £74 per ton. This is the best alloy not produced from virgin metal which can be recommended with confidence for un-stressed parts such as:- rocker covers, and timing covers. It will also die cast. Z.3. You did not give us a price for this material. We should like to know what this is ? We understand that it might be preferred to L.5 for die casting. One other point was raised, and that was the supply of a F.III crankcase for test in some less costly alloy. We believe the material recommended was either Alpax, or Birmasil special. We shall be glad to know which material you do recommend, and what percentage reduction in price per casting you would expect to be able to effect in production quantities. Yours faithfully, For ROLLS-ROYCE LTD. | ||