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).
Use of austenitic steel for Bentley chassis valves and the required tappet clearances.
| Identifier | ExFiles\Box 88\4\ scan0040 | |
| Date | 18th December 1933 | |
| E.{Mr Elliott - Chief Engineer} Dept. c. Hs.{Lord Ernest Hives - Chair} c. E.{Mr Elliott - Chief Engineer} c. Sft.{Mr Swift} c. Mx.{John H Maddocks - Chief Proving Officer} BENTLEY CHASSIS - VALVES. I notice that we are using austenitic steel in the new valve, and owing to the trouble which we had previously in France when we tried to use a similar steel for the exhaust and failure occurred due to insufficient allowance being made for tappet clearances it is most important that with the new material that the clearances worked to in France should be adhered to on production. Mr. Hancock informs me that his clearances were inlet .004 and exhaust .006 - these clearances are with the engine cold. BY.{R.W. Bailey - Chief Engineer} | ||