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).
Broken piston caused by the failure of an exhaust valve.
| Identifier | ExFiles\Box 83\1\ scan0468 | |
| Date | 22th April 1937 | |
| 2009 Sg.{Arthur F. Sidgreaves - MD} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c. to Hs.{Lord Ernest Hives - Chair} Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls}8/R.22.4.37. 6.B.IV. The reason for the broken piston on this car was the failure of the exhaust valve in No. 4 cylinder. When this car first went to France, the exhaust valves in cylinders 1, 2 and 3 were to a strength- ened design in KE.965 material. Those in cylinders 4, 5 and 6 were to this same strengthened design, but of S/SLV. One of these latter valves broke sometime ago, and we sent out as replacements standard KE. valves, one of these has now broken, and is the first occasion on which we have had a failure on the road. The strengthened variety of KE valve which are still running in cylinders 1, 2 and 3 have been stand- ardised, and are being introduced on the next Series of the cars. Our original reason for standardising them was because we had experienced occasional failures on the Test Bed. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||