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 urgent pattern alterations to a Bentley high power engine head to address overheating and pre-ignition issues.
| Identifier | ExFiles\Box 86\1\ scan0197 | |
| Date | 20th April 1936 | |
| To RHC.{R. H. Coverley - Production Engineer} X219 Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}16/KW.20.4.36. Bentley (High Power). We have had considerable trouble with overheating and pre-ignition on the original high power head Ex.20943. (1) Will you please take a further casting off the above pattern for sawing up to inspect the waterways. (2) Following this, the pattern to be altered to Ex.22419 which reduces the combustion chamber section to .250" and deletes stud boss webs for improved circulation. Two castings to be taken off the pattern thus altered. (3) Following (2), further pattern alteration to Rm.{William Robotham - Chief Engineer}112 which is more experimental, having a lowered spark plug position, improved sweep in the exhaust ports and the section around the spark plugs cut down. Two castings to be taken off this pattern. These are very urgent as the overheating trouble is our biggest problem. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||