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).
Potential crankcase and sump modifications for the Wraith model.
| Identifier | ExFiles\Box 148\5\ scan0419 | |
| Date | 22th August 1938 | |
| RHC.{R. H. Coverley - Production Engineer} c. Rm.{William Robotham - Chief Engineer} c. BY/Ald.{F. Allwood - Experimental Design} DA.{Bernard Day - Chassis Design}10/G.22.8.38. RE: WRAITH. Referring to RHC{R. H. Coverley - Production Engineer}/G.Mc.4/MJ.20.7.38. which we presume refers to the Wraith crankcases, our reply is as follows :- (1). Angle of Tachometer drive cannot be brought in line with oil connection boss from dynamo drive, as the drive would foul the water connection to cylinder. If the angle of the oil connection boss is made the same as for the tachometer drive boss, it will mean modifying three jigs as follows :- (a). For drilling the inclined boss. (b). For drilling the front crankcase face. (c). For drilling wheelcase joint face. There would also be an increased risk of oil leakage from wheelcase joint. (2). Does this apply to top or bottom half crankcase ? If to top half - the holes referred to are deleted after the 1st. 100 cars, and need not even be drilled on the 1st 100, as they are not used for Wraith lll at all. They were intended for the B.lll brake gear, but this has since been redesigned. There is a similar facing on the sump for the W.lll engine. This change should be referred to the Standards Department, as the tab washers and holes for same are determined by them. DA.{Bernard Day - Chassis Design} | ||