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 Ethyl Export Corporation discussing the technical aspects and problems of sparking plugs.
| Identifier | ExFiles\Box 162\4\ img159 | |
| Date | 29th July 1936 | |
| Cablegrams: ETHYLPORT, LONDON. COPY. 46001de Telegrams: ETHYLPORT, SOWEST. ETHYL EXPORT CORPORATION, THAMES HOUSE, MILLBANK, LONDON, S.W.1. Telephone: Victoria 1441. Head Office: 135 East 42nd Street New York, U.S.A. H.E.West, Esq., Experimental Department, Messrs.Rolls-Royce, Ltd., Nightingale Road, DERBY. 29th July, 1936. 81282 Dear West, Very many thanks for your letter of the 28th July, I hope you had a good holiday despite the weather. As a matter of fact I have only just returned from the States and havebeen rather busy clearing up and writing my American report. With regard to this vexed question of sparking plugs, I will endeavour to answer your questionnaire as well as I can. (a) It is rather difficult to give a direct answer here because there are two problems involved. If you use a short blunt nosed insulator it will virtually be a cool running plug, and when idling may allow a certain type of deposit to pile up rather quickly. Immediately upon subjecting the engine to more load this deposit will probably become an electrical conductor as it heats up, whereas it is a fairly good insulator when cool. I would say, however, that the short nosed insulator and the cool running plug generally would be more satisfactory than the K.L.G.850 type, that is to say if it does not suffer from over oiling. Also, I would suggest sparking points of heavy construction and similar to the four point B.G. aviation plug. | ||