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).
Letter from an oil supplier discussing the performance and corrosion risks of Extreme Pressure lubricants.
| Identifier | ExFiles\Box 145\3\ scan0223 | |
| Date | 31th July 1934 | |
| COPY Telephone: Temple Bar 1234 SHELL-MEX BP LTD Telegrams: Shelbeepee, London Telex, SHELL-MEX AND B.P. LTD Distributors for the Shell and Anglo-Persian Oil Groups P.O. BOX NO. 148 . SHELL-MEX HOUSE VICTORIA EMBANKMENT . LONDON . W.C.2 Your Reference.................. Our Department T. & R.{Sir Henry Royce} LGC/LD. Date 31st July 1934. E.{Mr Elliott - Chief Engineer} W. Hives, Esq., Messrs. Rolls-Royce Ltd., DERBY. Dear Mr. Hives, Since our last meeting I have been going into the question you raised in connection with Extreme Pressure Lubricants and find that we have made a certain amount of progress with one which contains one of the sulphur compound dopes, and I think it may be of interest to you to know that we made a practical road test with this for some 5,000 miles with a Packard car, which has a hypoid gearing. To aggrevate corrosion conditions approximately 1% of water was introduced and we found that no corrosion whatever occurred. EXTREME PRESSURE LUBRICANTS. There are, as you no doubt know, two mechanical laboratory equipments for testing E.P. Lubricants, namely, the Gleason and the Timken, and both of these go to show that as the percentage of dope added to the lubricant increases the tendency towards corrosion rises. With our present E.P. Lubricant we have found that with the same proportion of dope as was used in the Packard car a loading equivalent to 33,000 lbs per square inch showed no signs of corrosion. If, however, the loading was increased above this corrosion occurred again. To withstand higher pressures the dope content has to be increased, then, however, the risk of corrosion comes in again. [Logo: NATIONAL SCHEME FOR DISABLED MEN] All offers subject to acceptance by return of post unless otherwise stated | ||