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).
Specification sheet for different types of cylinder materials and their chemical compositions.
| Identifier | ExFiles\Box 132\5\ scan0103 | |
| Date | 1st July 1939 | |
| 1123. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}5/MH.{M. Huckerby}1.7.39. CYLINDER MATERIALS. SERIES A.{Mr Adams} (Sand Cast). A.100 2½% Nickel. Similar to A.101 (our standard cylinder iron) except for the nickel content which is raised to 2.5% and Silicon reduced slightly to maintain a balance of the elements. A.101 Standard material. TC. Si. Mn. S. P. Ni. 3.1-3.3% 1.8-2.0% .8-1.0% .10 (max) .25 .8-1.0% A.102 Nickel Chrome Alloy. This material is identical with "Chromidium" as produced by Midland Motor Cylinder Co. but with the addition of 1.0% Nickel and slightly less Silicon content, in order to maintain a hardness within the specified range of the standard material (202-241 Br.{T. E. Bellringer - Repair Manager}) A.103 Nickel Chrome Molybdenum Alloy. TC. Si. Mn. S. P. Ni. Cr.{Mr Cra???ster / Mr Chichester} Mo. 3.1-3.3% 1.8-2.0% .8-1.0% .10(max) .25 .8-1.0% .35 .35 This is recommended by RHC{R. H. Coverley - Production Engineer}/Vs.{J. Vickers} to replace existing cylinder block material, consistent with his trip to Germany etc. | ||