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 to K.L.G. Sparking Plugs Ltd. regarding issues with lead deposit on the 850 type plug and suggestions for redesign.
| Identifier | ExFiles\Box 162\4\ img156 | |
| Date | 27th July 1936 | |
| 86001b. Hs{Lord Ernest Hives - Chair}/Wst.7/JH. 27th July, 1936. Major Carington, Messrs. K.L.G. Sparking Plugs Ltd., Putney Vale, London, S.W.15. Dear Major Carington, I have been thinking quite a lot about the effect of lead deposit on car sparking plugs, causing mis-firing after running under town conditions, and I think the long insulator nose used on the 850 type of sparking plugs is definitely a disadvantage in this respect. I think it is quite possible that the 850 plug redesigned with a fairly short blunt nose insulator and with the heat factor equivalently reduced by say, either deleting the copper sleeve round the central electrode or by using a material having less heat conductivity than copper, would be a better proposition. I should like your remarks on this matter as we are viewing the troubles we have experienced rather seriously. Yours sincerely, | ||