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).
Comparison table of valve clearance increases for various materials at 80°C.
| Identifier | ExFiles\Box 66a\2\ scan0028 | |
| Date | 23th April 1926 guessed | |
| contd :- -2- Material. | Valve. | Increase of clce. at 80°C (water & oil) relative to clce. when engine cold. ----------------------|---------------|---------------------------------------------------------------------------- Standard steel. | Inlet. | .006" to .007" | Exhaust. | Corronil(Monel) | Inlet. | .004" | Exhaust. | Brass. | Inlet. | - .004" to - .005" | Exhaust. | Drawn phos. brz. | Inlet. | O | Exhaust. | O Gunmetal (BZ/G). | Inlet. | O to - .002" | Exhaust. | Cast Phos. Brz. | Inlet. | O to - .002" | Exhaust. | 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} | ||