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).
Potential issues with aluminium coating on exhaust manifolds and proposing experimental tests.
Identifier | ExFiles\Box 66\2\ scan0316 | |
Date | 4th May 1928 | |
H1. Hs.{Lord Ernest Hives - Chair} Rg.{Mr Rowledge} X8230 BY3/G.4.5.28. PRODUCTION OF EXHAUST MANIFOLDS. -------------------------------- With reference to an attempt we have been making to protect our chassis exhaust manifolds by the use of a coating of aluminium added by the Schoop pistol process, a point arises in this connection which I think demands careful consideration experimentally viz. it appears to me that the aluminium may gradually penetrate into the material of the pipe, in any case it will alloy with the skin, and the continued heat effect may result in the pipes becoming embrittled in view of the aluminium penetrating. Possibly you may have some information on the subject already, if not I think we certainly ought to have some sample pieces of steel treated by the Schoop process and then maintained at a temperature of 600° to 700°C for some long period, after which they could be tested either by an Upton Lewis or for ordinary brittleness by testing with a hammer. Obviously a large number of pieces of steel should be produced, say 10 or a dozen which need only be in short lengths, the majority of these would be treated, but at least three samples would be left untreated for comparative test results. I am leaving it to you to decide the thickness of the piece, which should not exceed .250, and the other dimensions which you think would be desirable. Possibly it would also be worth while testing some thinner samples, so as to correspond more definitely with the steel likely to be used in the exhaust manifold itself. BY.{R.W. Bailey - Chief Engineer} | ||