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).
Instruction memo detailing altered blueprints and replacement parts for the 20/25 HP Chassis valves and fittings, specifically for a Cast Iron Turbulent Head with increased valve lift.
| Identifier | ExFiles\Box 106\5\ scan0052 | |
| Date | 14th July 1931 | |
| For RMC. (crossed out) c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Y5060. BY/CS3/EH.14.7.31. Re 20/25 HP Chassis Valves & Fitts: - Sec:5060. (Cast Iron Turbulent Head with increased Valve Lift). Please receive herewith altered blueprints of the following drawings, detailed in accordance with Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}'s. instructions. E.56907 Pedestal (Front & Rear) replaces E.54966. E.56908 " (Inner Inter:) " E.54967. E.56909 " (Intermediate) " E.54968. E.56910 " (Centre) " E.54969. Will you please instruct up the above as required for experiment, together with the following existing parts. E.56629 Rocker Arm (L.H.) 6 off. replaces E.54946. E.56630 " " (R.H.) 6 " " E.54947. E.56631 Rocker Shaft 2 " " E.54963. E.56821 Valve Stem Packing 12 " " E.50165. E.56823 Push Rod 12 " " E.54935/6/7/8. E.56832 Wedge 12 " " E.50147. E.56833 Top Washer 12 " " E.51088. E.56834 Bottom Washer 12 " " E.50148. E.56851 Valve (Inlet) 6 " " E.54949. E.56852 Valve (Exhaust) 6 " " E.54948. Remainder of parts to complete this instruction are to LOP.E.55049. This instruction is alternative to that issued in our memo: BY/CS6/EH.12.6.31. BY/CS. | ||