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).
Modification proposal to introduce a radiused finish to cylinder bores to prevent scotching on working faces.
| Identifier | ExFiles\Box 86\1\ scan0258 | |
| Date | 14th February 1928 | |
| BENTLEY STANDARDIZATION of PARTS MODIFICATION TO CYLINDER BLOCK Description of Parts affected Origin: To prevent scotching on working faces of Piston. Report on Experimental Test. I.O.D. No. Date: 14.2.28 X on S.I. Drawing No. MB.2927 Cylinder bores have smooth finished radius at mouth instead of existing chamfer on drawing F.111. This modification reduces amount of scotching on working side of the bore as the piston changes from one side of the bore to other as bottom dead centre position has been passed. Estimated cost of new tools £5. 0. 0. Could be brought on to production at the 1st. chassis in "M" series (without scrap). It is not considered that Factory Costs will be decreased by the introduction of radiused instead of chamfer finish of cylinder bores and the piston wear will be reduced by this modification. AMC. 21.1.28 INITIAL | DATE | REMARKS S.C. | | H.S. | | Agreed H.S. C | 2.2.28 | Agreed C. F | 2.2.28 | A.G. | 8.2.28 | Agreed A.G. B.Y. | 10.2.28 | Agreed by Y.B. E.B.X. | | R.H.C. | 29.2.28 | Agreed RHC{R. H. Coverley - Production Engineer} (see) X.M. | 2.2.28 | Agreed X.M. M.R. | 8.2.28 | Agreed M.R. (see over). | ||