Parts required for fitting to a Wraith III chassis, including a specific camshaft, pistons, and new cylinder block.
| Identifier | ExFiles\Box 109\5\ scan0116 | |
| Date | 23th February 1939 | |
| 664 To HPS. {Horace Percy Smith - Experimental Factory Mgr} Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 1/JH.23.2.39. Sg {Arthur F. Sidgreaves - MD} 's. car (Wraith III). In accordance with the memo. Rm. {William Robotham - Chief Engineer} 1/R.20.2.39. will you please prepare the following for fitting to the above chassis. (1) EB.3466 camshaft. (2) No.1, 3 and 5 pistons EB.4587 which Rm {William Robotham - Chief Engineer} /CTs. {C. Trot Salt - Carburation} will supply. No.2, 4 and 6 pistons EW.2121 (R.R. split skirt) The above are raised crown pistons which give a compression ratio of 6.5 : 1. (3) Klingerit cylinder head gasket which Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} will supply. (4) New cylinder block to be fitted with short inserts as follows. No.1 and 2 standard bores (no inserts Nos. 3 & 4 (Mark A.101 alloy) std. material in short liner form. No. 5 & 6 (Mark A.105 alloy) Ditto material with covered chills. The above alloy references are in accordance with the memo. RHC {R. H. Coverley - Production Engineer} /Vs. {J. Vickers} It is necessary to standard bore dimensions as there are no raised crown pistons available for oversize cylinder bores. As stated in the memo. Rm {William Robotham - Chief Engineer} /CTs. {C. Trot Salt - Carburation} 3/R.21.2.39. a number of cars are to be prepared with special in erts fitted in the blocks and various types of pistons as allocated for this car. Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} | ||
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).