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 to supply blueprints for a 'Bump Crown' piston to increase the compression ratio for a B.60 Chassis.
| Identifier | ExFiles\Box 123\5\ scan0062 | |
| Date | 23th August 1938 | |
| HPS{Horace Percy Smith - Experimental Factory Mgr} c. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 1044 BY/Ald.{F. Allwood - Experimental Design}8/G.23.8.38. B.60. CHASSIS. PISTON - SECTION 5040. [Initialled] Please receive herewith three blueprints of the following :- Ex.S.928 Piston - Bump Crown. 6 off. The following part is not required :- EB.3916 Piston 6 off. The above is as verbally requested by Rm.{William Robotham - Chief Engineer}, to provide a piston with a bump crown, which will increase the compression ratio from 6.4 to 7.4 - 1. Kindly instruct 1 set. aed BY/Ald.{F. Allwood - Experimental Design} | ||