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).
Copy of a letter from Chrysler Corporation to Wellworthy Piston Rings Ltd. requesting information on AC.9 bearing metal.
| Identifier | ExFiles\Box 115\5\ scan0264 | |
| Date | 6th April 1939 | |
| COPY! From the Chrysler Corporation, Detroit, Michigan, U.S.A. Wellworthy Piston Rings Ltd., Lymington, Hants, England. April 6, 1939. Gentlemen: Having noted a recent publication concerning your Rolls-Royce AC.9 bearing metal, we should like to have further details concerning it insofar as you are able to release them. Aspects of this metal which would interest us are, heat conductivity, yield point - compressive and tensile, ultimate strength - compressive and tensile, hardness and corrosion resistance. We should also be interested in knowing whether or not this metal can be satisfactorily finished by broaching, and whether or not it has been successfully combined with any other metal, such as a steel back, to form a two-layer bearing. Also with or without a back, what is the thinnest bearing you are prepared to recommend for connecting rod service ? What clearances are essential for a 2" journal running at 300°F and 4,000 R.P.M. ? What cold clearance will this involve ? Your friction loss curves speak for themselves. What experience have you had in regard to scoring ? In short, we are interested in having any information you can give us that bears directly or indirectly on the applicability of this metal to use for connecting rod and main bearings in automobile engines. We should also be interested in having a specimen bearing if you care to send one. Hoping to hear from you at an early date, I am Very truly yours, CHRYSLER CORPORATION ENGINEERING DIVISION, Edward T. Johnson, | ||