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 Heath Plugs, Limited, defending their spark plug design against claims of sooting and oiling up.
Identifier | ExFiles\Box 33\3\ Scan105 | |
Date | 9th February 1921 | |
COPY OF A LETTER RECEIVED FROM:- HEATH PLUGS, LIMITED, (Works) SANCROFT STREET, PLEASE REPLY TO WORKS. KENNINGTON CROSS, LONDON, S.E.11. February 9th. 1921. Refs. Your (Wd{Mr Wood/Mr Whitehead}2/NJ5221 Ours (AEH/W/3 Messrs. Rolls-Royce Ltd., Nightingale Road, DERBY. ✓1812 For the attention of J.{Mr Johnson W.M.} Whitehead Esq. Dear Sirs, We are in receipt of yours of the 5th.inst. and are pleased to note your further remarks. We beg to thank you for the trouble you have gone to with regard to the information we required. We are absolutely at a loss to understand what has happened when you say our plugs rapidly oiled or sooted up, and after cleaning them they again failed after a very short run. We feel certain the cleaning to which you refer was only a superficial wiping of the outside of the baffle as the plugs showed no signs of having been unscrewed to clean the business end of the porcelain which is so very easily done, as in our plug the insulator, gland nut, and joint washer are removable as one unit. We feel confident that the member of your staff who carried out the tests was not conversant with the internal construction, as on one or two occasions our plugs have been criticised by the appearance of the firing end being like other makes of plugs which it is well known soot or oil up very easily, whereas with our plug, the inside design of which is totally different and we claim it is practically impossible to soot or oil them up, as there is practically no combustion takes place in the inner chamber, which houses the insulator. Numerous of our customers assert it is impossible to oil them up. We very much appreciate your kind offer to test another set of plugs, which we shall be most pleased to forward in due course. The writer would very much like to call on you and give you a practical demonstration of the action of our plug, when w | ||