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).
Technical bulletin on the application of colloidal graphite for improved lubrication in internal combustion engines.
| Identifier | ExFiles\Box 145\3\ scan0012 | |
| Date | 1st January 1932 | |
| Left Page: TECHNICAL BULLETINS A few of the many uses for Colloidal Graphite in industry are described in a series of Technical Bulletins, published by E.{Mr Elliott - Chief Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Acheson, Limited. The titles are listed below. No. Subject. 11.4 The Use of Colloidal Graphite in the Manufacture of Electrical Resistances. 31.3 Colloidal Graphite as a Retardant of Secondary Emission in Radio Valves. 92.5 Colloidal-Graphited Oils. 102.5 The Lubrication of small Mechanical Devices. 112.5 The importance of Colloidal Graphite Lubricants in 'Running-in' Operations. 130.4 Colloidal Graphite as a High Temperature Lubricant. 171.4 A Method of Making Electrical Contact with Ebonite and soft Rubber for Insulation Tests. 200.4 The Mechanics of Lubrication with Colloidal Graphite. Copies of the above may be obtained on request to E.{Mr Elliott - Chief Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Acheson Ltd., (Original Address: 40, Wood Street, London, S.W.1) (Stamped Address: THAMES HOUSE, MILLBANK, LONDON, S.W. 1.) BALDING & MANSELL, 6 SNOW HILL, E.C.1 PRINTED IN ENGLAND Right Page: TECHNICAL BULLETIN Pertaining to the Application of Colloidal Graphite to Industry Issued by E.{Mr Elliott - Chief Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} ACHESON, LTD. Copyright 1932 By E.{Mr Elliott - Chief Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Acheson, Ltd. LONDON FILE INDEX "Oildag" Lubrication Assembly "Running-In" Upper-Cyl. Gears Number 42.2 IMPROVED LUBRICATION OF INTERNAL COMBUSTION ENGINES. (Automobile) The initial lubrication of Internal Combustion Engines, in order to reduce wear to a minimum, leaves room for improvement. Such improvement can be brought about by the use of Colloidal Acheson-Graphite during Assembly and 'Running-in' processes. The improvement in lubrication is due mainly to the formation of 'Graphoid Surfaces'* the value of which is clearly outlined in Technical Bulletin No. 112, whilst an account of how they are formed is the subject of Technical Bulletin No. 200. The reduction of cylinder wear receives special attention by the manufacturers and users of Automobile and similar engines because the total friction between pistons and cylinders is usually considerably greater than that between the other bearing surfaces in an engine. Apart from the oil supplied from the crankcase, additional lubricant introduced with the petrol or other fuel tends to improve lubrication of the upper portion of the cylinders. Here again, Colloidal Acheson-Graphite is found to be beneficial because the Graphoid Surfaces which it forms are unaffected by the temperature of combustion and the washing action of the petrol or fuel. ASSEMBLY. When a new engine or machine is assembled it is customary to smear the working surfaces with a lubricant so that when it is started up an initial supply of lubricant is present on the bearing surfaces to prevent damage before the oil supply is circulated. It will be readily understood that much harm may be done if the initial lubricant supply is inadequate to withstand the load. As a result of the treatment of bearing surfaces with Colloidal Graphite two purposes are served, Firstly, the adsorption of the Colloidal Graphite to the bearing metal enables lubricating oil to spread more uniformly and rapidly; Secondly, the 'Graphoid Surface' being partially self lubricating the possibility of damage occurring before the full oil supply reaches the bearings is considerably minimised. A compound comprising Colloidal Acheson-Graphite in a suitable neutral mineral oil makes an effective lubricant. Such a compound smeared on to the various carefully cleaned working surfaces, after machining or whilst the engine or machine is being assembled allows adsorption of the Colloidal Graphite to the metal to take place during the interval which elapses before the engine or machine is ready for test. "RUNNING-IN." During the 'running-in' of a new engine on the test-bed the lubricant is called upon to work | ||