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).
15,000-mile test run comparing a lower Brinell hardness cylinder block from Midland Cylinder Co. against a standard block.
| Identifier | ExFiles\Box 132\4\ scan0067 | |
| Date | 26th May 1937 | |
| Hs.{Lord Ernest Hives - Chair} from Rm.{William Robotham - Chief Engineer} c. E.{Mr Elliott - Chief Engineer} c. By.{R.W. Bailey - Chief Engineer} c. RHC.{R. H. Coverley - Production Engineer} c. EHS. c. HI. 1124 Rm{William Robotham - Chief Engineer}1/R.26.5.37. We have now completed a 15,000 mile run on one of the cylinder blocks manufactured by the Midland Cylinder Co., and having a Brinell from 205 to 214, as opposed to our standard practice of 244 to 271. The test on this block was run largely in parallel with one on 6.B.IV, having one of our standard blocks on it. We attach two blueprints which show the respective wear on these two cylinders. The results show that the lower Brinell block has worn better than the higher Brinell block. This confirms Buick practice and expressions of opinion which we heard during our recent visit to the United States. We do not consider that the results of the run in France, under high speed conditions, are conclusive but we do think that the figures obtained are sufficiently satisfactory to justify putting a number of cylinder blocks through on production. Rm.{William Robotham - Chief Engineer} | ||