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).
Cylinder bore distortion, its effect on oil consumption, and proposed grinding methods to rectify it.
| Identifier | ExFiles\Box 86\1\ scan0228 | |
| Date | 4th January 1936 | |
| 8219 RHC.{R. H. Coverley - Production Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to HPS.{Horace Percy Smith - Experimental Factory Mgr} Rm{William Robotham - Chief Engineer}/Swd115/R.4.1.36. CYLINDER BORES. GWH.{George W. Hancock - Head Chateauroux} recently obtained some very good oil consumption results on a cylinder block which had been re-ground at Kingsbury. The measurements show that the bores in this block, as taken in any position, are true to within .0005. When bolted down on to the crankcase with the cylinder head in position, distortions take place up to .002" variation. This may be due either to the crank-case, the cylinder block or the cylinder head, or a com-bination effect. It is intended to try and separate out the effect of each, but this will take some time, and as the ultimate result will be effected, if any, on the oil consump-tion, we wonder if you can short circuit this result in the following way. Cylinder block ground in position on the crankcase, and bolted down by the cylinder head. It will no doubt be necessary to either machine out a scrap head, or insert a packing between the cylinder block and the head in order that the grinding can be carried throughout the bore. Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} has all the distortion figures which have been taken on the block submitted by GWH.{George W. Hancock - Head Chateauroux} The above grinding if possible to be carried out on a production Bentley cylinder block and unit with instructions for an oil consumption to be carried out in the Test Dept. It may be of some importance to see that the order in which the cylinder headnuts are tightened down be similarly carried out when setting up for grinding, and in assembly of the engine for test. L.H. Swindall. | ||