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).
Valve material tests, detailing clearance changes under heat and load conditions.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan026 | |
| Date | 22th April 1926 guessed | |
| contd :- -2- | Material. | Valve. | Increase of clearance at 80°C (water and oil) relative to clce. when eng. cold. | |---|---|---| | Std.steel. | Inlet. Exh. | .006" to .007" | | Corronil (Monel) | Inlet. Exh. | .004" | | Brass. | Inlet. Exh. | -.004" to -.005" | | Drawn Phos. Bronze. | Inlet. Exh. | 0 | | Gunmetal BZ/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} | Inlet. Exh. | 0 to -.002" | | Cast Phos. Bronze. BZ/PC. | Inlet. Exhaust. | 0 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} | ||