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).
List of specifications for various engine components including the crankshaft, connecting rods, and pistons.
| Identifier | ExFiles\Box 97\1\ scan0058 | |
| Date | 12th August 1937 | |
| -2- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}3/AP.12.8.37 (4) Crankshaft As Wraith III. in 'Hykro' with modified oil holes in accordance with our memo to the D.O. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/JH. 30.6.37. (5) Connecting Rods. As Wraith III. with mods to suit single hole feed in bearing bush in accordance with our memo to the D.O. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}7/AP.3.7.37. This includes the die cast A.C.6. big end bearing. (6) Pistons. Aerolite pistons, up-to-date Bentley Production. (7) Cylinder Block. Integral barrel block in accordance with LeC.5778. (8) Cylinder Head. Design of head not yet issued which includes alteration to comp. ratio and length of valves. (9) Valves and Fittings. (a) Bottom tappets in I/C. with chilled face Ex.28101. (b) Push rods to Ex.28100. Other parts of valve gear dependent upon the new cylinder head. (10) Inlet Pipes. Design of pipes to suit 2 S.U.carbs. still pending. (11) Camshaft and bearings. Bearings etc. as Wraith III. No decision at present regarding the camshaft. (12) Water Pump As Wraith III. including mod. to suit rubber joint LeC.5779. continued | ||