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).
Specification list for various engine components and configurations.
| Identifier | ExFiles\Box 155\2\ scan0258 | |
| Date | 11th November 1938 | |
| -3- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}9/JH.11.11.38. Original large valve cylinder head, which with .030 Klinger head joint gives 6.1 : 1 comp. ratio. No. 7 - 12 push rods in .4 carbon steel. EB.3466 camshaft. Delco distributor and spring drive. Unhardened crank and dynamo pinions. A.C. type oil filter. Original Attwaters samwheel. B.III No.5 Unit 15,000 miles unit. returned out of 8.B.V. for inspection Crankcase to suit Vandervell W/M strip main bearings (Arrg. L.1076). Cast steel bearing caps to suit. .4 Carbon steel crankshaft (Bentley balance wts) Forged to size con. rods with yet ho'es. Thick section non standard big end brgs. A.C.9. Raised crown Aerolite pistons (Rm.{William Robotham - Chief Engineer}522) with .030 gasket (Klingerit) gives 6.6 : 1 ratio. EW.1854 unstrengthened cylinder head. Correct size valves i.e. 1.5 inlet and 1.3 exhaust. Neoprene rubbers in place of springs under rocker nuts. Gaskoid rocker cover joint. No.4, 5 and 6 cylinder inlet valves supplied by Les.{Ivan A. Leslie} from Motor Components S/SLV. Vandervell W/M rocker bushes. ECD.846 seal top valve spring washers. Ex.31550 camshaft. | ||