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 De Havilland to Mr. Robotham discussing increased engine oil consumption following decarbonisation.
| Identifier | ExFiles\Box 148\3\ scan0145 | |
| Date | 31th July 1936 | |
| X1256 ALL LETTERS SHOULD BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS. THE DE HAVILLAND AIRCRAFT CO. LTD. DIRECTORS: A.S.BUTLER CHAIRMAN G.DE HAVILLAND C.C.WALKER F.T.HEARLE F.P.MILLS W.E.NIXON F.E.N.St.BARBE A.E.HAGG STAG LANE EDGWARE MIDDLESEX ENGLAND TELEPHONE: EDGWARE 0171 (8 LINES) TELEGRAMS: HAVILLAND PHONE, EDGWARE CABLES: BENTLEY CODE. ASSOCIATED COMPANIES IN AUSTRALIA, CANADA, INDIA AND SOUTH AFRICA LHP/EDG. 31st. July, 1936. W.A.Robotham, Esq., Rolls-Royce Ltd., DERBY Dear Mr.Robotham, I am very interested in the last sentence of the last paragraph of your letter, namely, that when the engine has been decarbonised the oil consumption goes up. We were constantly up against this at Daimlers even though the Pistons had not been touched except in-so-far as the carbon had been removed from the Piston heads. I found, however, that invariably the inlet valves had been very carefully cleaned so that the film of carbon was removed which inhibited the oil going down the inlet valve stem. By leaving the inlet valve alone we found that the oil consumption before and after decarbonising, was generally the same. Yours sincerely, [Signature] CONTRACTORS TO THE AIR MINISTRY, DOMINION, COLONIAL AND FOREIGN GOVERNMENTS THROUGHOUT THE WORLD PROPRIETORS OF THE DE HAVILLAND SCHOOL OF FLYING . HATFIELD . HERTS ALL SALES ARE MADE SUBJECT ONLY TO THE COMPANY'S SPECIAL WARRANTY. | ||