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).
Information regarding the properties and use of aluminium bronze for inserted valve seats.
| Identifier | WestWitteringFiles\P\July1926-September1926\ Scan124 | |
| Date | 27th September 1926 | |
| FOR R.{Sir Henry Royce} FROM E.{Mr Elliott - Chief Engineer} C. to -- " -- " HS.{Lord Ernest Hives - Chair} " -- ORIGINAL 28 9/26 H E1/M27.9.26. ALUMINIUM BRONZE INSERTED VALVE SEATS. X6060 X3822 X1497 The following information appears in this months' journal of the S.A.E. of America in connection with aluminium bronze:- "This alloy makes a very remarkable valve seat metal as its co-efficient of expansion is about the same as that of aluminium. "The valve/insert, after a few hours of engine running, presents a mottled appearance almost as if the metal were pitting. We find however that this is not the case, and to recut the seats because of this appearance is not wise. "The valves will continue to function for hundreds of hours without trouble with this construction if the proper cooling is provided around the valve insert. The material can be heat treated to give about 200 Brinell hardness for this work. "In alloys with iron and steel, the Brinell hardness can be raised to more than 300 by heat treating." Aluminium bronze is used it is understood by both Curtiss and Wright for valve seats on both water and air-cooled engines. E.{Mr Elliott - Chief Engineer} | ||