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).
Design alterations for the Wraith III and Bentley 111 connecting rod bush without shims.
Identifier | ExFiles\Box 132\2\ scan0239 | |
Date | 8th February 1938 | |
Handwritten: Swdl{Len H. Swindell} Files Handwritten: Does this mean another 1000 mile test on Cny Handwritten in red: 1119 BY/NS.{Norman Scott} C. Rm.{William Robotham - Chief Engineer} [Struck through] C. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} [Struck through] C. RMC/CAN. DA.{Bernard Day - Chassis Design}17/G.8.2.38. WRAITH 111 and BENTLEY 111. CONNECTING ROD BUSH WITHOUT SHIMS. Please receive herewith E.CD.471 Connecting Rod Bush without shims - Wraith 111 and Bentley 111. This design is intended for use in place of the parts already made to Ex.29397, Ex.29697/8 etc.; the alteration mainly concerns the dowel for big end bush which has been modified from Ex.29397, as follows:- (1). The length of the portion which fits into con. rod is increased from .100 to .250. (2). The diameter of the above portion is increased from .3135 to .377, this enables the use of the .375 diameter countersink for centreing the rod when boring stem. (3). The interference fit of dowel in rod is altered to (.001 to .002) instead of (.000 to .001). (4). The clearance between the back of bush and dowel has been altered from .025" to .010 so that should the dowel move, it will rest against the bush and nut rub on the crankpin. Will you please detail and instruct these alterations experimentally, noting that the rodshould be panel milled as called for on E.CD.78. The decision as to whether the bushes should be flanged or not must await further experiments. In accordance with memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}6/AP.28.1.38. the forgings for the connecting rods and caps may be ordered fro the 100 sets, but not machined until further instructions. If there is any doubt regarding the tightness of the dowel in rod, it would appear worth while to consider freezing the dowel for assembly. DA.{Bernard Day - Chassis Design} | ||