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).
The investigation into stretching and collapsed exhaust valves on the Phantom model.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan176 | |
| Date | 10th May 1928 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} PHANTOM. EXHAUST VALVES STRETCHING. Hs{Lord Ernest Hives - Chair}3/LG10.5.28. 18230 17230 We have examined valves out of the engines which had this trouble in France. Measurements shew that it is the head of the valve which has collapsed. From the appearance of them one would not say that they had been seriously over-heating. We have not been able to reproduce this fault at the Works. We have carried out tests on the bench running the engine at all speeds under full load conditions - we have also tried to reproduce it on the road, on 12-EX car which actually gave trouble in France. The Works are already instructed as regards producing the new valve and this will be used on all cars as soon as available. Tests with other valve steels are in hand. Hs.{Lord Ernest Hives - Chair} | ||