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).
New standard cylinder heads and valves for the No.12 and B-9 units, including part numbers and material availability.
| Identifier | ExFiles\Box 96\2\ scan0114 | |
| Date | 5th June 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}4/JH. 5.6.36. New standard cylinder heads and valves required for No.12 unit, existing heads are obsolete. 25/30 units. Standard cylinder head originally off B-9 unit to be brought up to standard, that is E.60892 inlet valves. E.61073 exhaust valves KE.965. EB.175 valve springs. Cylinder head on which we are carrying out valve temperatures on B-9 has longer valve guides on exhaust. Following this increased dia. valves are to be tried E.60813. All cylinder heads dealt with to have indentification plate fitted. Some time ago exhaust valves in Silichrome X were ordered but these were only available in America. L. Buckler dealt with the job, as yet we have not had any for trial. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||