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).
Part number changes for an increased valve lift on a 20/25 HP chassis cylinder head.
| Identifier | ExFiles\Box 103\4\ scan0077 | |
| Date | 14th May 1931 | |
| TO T.D.C. c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Y 5050 BY/CS6/EH.14.5.31. Re 20/25 HP Chassis - Cylinder - Sec: 5050. Valves & Fittings - Sec: 5060. Increased Valve lift. (Alum. Turbulent Head). Please receive herewith marked up blueprints of the following:- Section 5050. E.56638 Pedestal Studs replaces E.54972 E.56639 " " " E.54973 Section 5060. E.56629 Rocker Arm (L.H.) replaces E.54946 E.56630 " " (R.H.) " E.54947 E.56631 Rocker Shaft " E.54963 E.56632 Pedestal(Front & Rear) " E.54966 E.56633 " (Inner Inter:) " E.54967 E.56634 " (Intermediate) " E.54968 E.56635 " (Centre) " E.54969 E.56636 Valve (Inlet) " E.54949 E.56637 " (Exhaust) " E.54948 E.56640 Push Rod " E.54938 The above are as requested by Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} in memo: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}10/KT.6.5.31. This completes the instruction for this experiment. RECEIVED 1931 MAY 14 BY/CS. | ||