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).
Requesting modifications to a Bentley (High Power) cylinder head pattern to reduce the compression ratio.
| Identifier | ExFiles\Box 86\1\ scan0204 | |
| Date | 16th June 1936 | |
| X219 To RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}30/KW.16.6.36. Bentley (High Power). Will you please have 2 castings taken off the existing pattern Ex.22594 cylinder head. The casting around the exhaust seats to be chilled to raise the Brinell figure with a view to reducing the amount of pocketing. Following the above, the pattern to be altered to Rm.{William Robotham - Chief Engineer}161, which is to reduce the compression ratio to 6.5 : 1 for trial on a standard unit. 2 castings to be taken off the pattern thus altered. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||