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).
Table comparing valve clearance changes for various materials at 80°C, with associated test notes.
| Identifier | ExFiles\Box 142\4\ scan0130 | |
| Date | 7th July 1926 guessed | |
| contd :- -2- | Material. | Valve. | Increase of clce. at 80°C (water & oil) relative to clce. when engine cold. | |---|---|---| | Standard steel. | Inlet. Exhaust. | .006" to .007" | | Corronil(Monel) | Inlet. Exhaust. | .004 | | Brass. | Inlet. Exhaust. | - .004" to - .005" | | Drawn phos. brz. | Inlet. Exhaust. | O O | | Gunmetal (BZ/G). | Inlet. Exhaust. | O to - .002" | | Cast Phos.Brz. | Inlet. Exhaust. | O to - .002" | The - ve. sign represents a decrease of the initial clearance. It is seen that the BZ/PD. behaves very satisfactorily under light load conditions. We are continuing the tests to find out how the clearance of the drawn phosphor bronze rods is influenced by full load. A set is also being tested on a car. Hs.{Lord Ernest Hives - Chair} | ||