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).
Extract from a report on the failure of an aluminium-treated exhaust manifold on car 14-G-4, which has cracked and the aluminium melted away.
| Identifier | ExFiles\Box 5a\2\ 02-page031 | |
| Date | 10th January 1929 | |
| To E.{Mr Elliott - Chief Engineer} } FROM HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} To DA.{Bernard Day - Chassis Design} } X5820C Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG10.1.29 X5230 We give below an extract from a personal report received from Hancock in connection with the exhaust manifold on 14-G-4 car :- "The exhaust manifold of 14-G4, has cracked round the top flange on the first manifold pipe. The schoop method of aluminium treatment is not satisfactory, the alum. has now been melted away. At the end of each run there has been small balls of aluminium formed on the pipe. This could be brushed off easily until finally the whole of the aluminium has disappeared. We now have the plain steel pipe left. It would appear that the heat of the exhaust manifold must be of a higher temperature than the melting point of aluminium". Hs{Lord Ernest Hives - Chair}/Rs.{Sir Henry Royce's Secretary} | ||