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).
Research on alloy cast iron cylinder bore wear, comparing sand and centrifugally cast materials.
| Identifier | ExFiles\Box 132\4\ scan0156 | |
| Date | 9th August 1938 | |
| 1124 Rm.{William Robotham - Chief Engineer} c to By.{R.W. Bailey - Chief Engineer} c to Hs.{Lord Ernest Hives - Chair} c to RHC.{R. H. Coverley - Production Engineer} c to HPS.{Horace Percy Smith - Experimental Factory Mgr} c to Rm{William Robotham - Chief Engineer}/Swl. c to Rm{William Robotham - Chief Engineer}/OTS. RHC{R. H. Coverley - Production Engineer}/Vs.{J. Vickers}1/JT.9.8.38. Research on Alloy Cast Iron Cylinder Bore Wear. Following upon the instructions contained in your memo Rm.{William Robotham - Chief Engineer}7/R.9.5.38 to enable the Experimental Dept. to obtain accurate relative bore wear figures, we are producing the following cylinder block materials in loose liner form. It should be understood that the tests are intended to cover both sand cast and centrifugally cast materials, since these are two distinct propositions from the foundry point of view, i.e. those materials recommended for sand castings are not suitable for centrifugal casting and vice-versa. Thus whilst we are confident that by far the better materials from a bore wear point of view come under the Centrifugal section, these could only be adopted with a linered engine, and could not be used to replace our existing material for sand cast blocks. The approximate relative cost of each material is given. Series "A". Sand Cast. 1. Standard Material & Method (Mark A101) These liners are being produced in the standard material, and by the standard sand cast method, and will give datum figures on which to base the relative value of the remainder of the materials and methods. TC Si. Mn. S. P. Ni. 3.1 - 3.3% 1.8 - 2.0% .8 - 1.0% .10 max. .25 .8 - 1.0% Brinell 201-229 2. Nickel Chrome Alloy (Mark A102) This material is identical with "Chromidium" as produced by the Midland Motor Cylinder Co. but with the addition of 1.0% Nickel and a slightly less Silicon content, in order to obtain a hardness within the specified range 202 - 241. | ||