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).
Product information sheet for KLG sparking plugs for motor cars, motor cycles, and marine engines.
| Identifier | ExFiles\Box 58\3\ Scan090 | |
| Date | 30th June 1925 guessed | |
| "KLG" SPARKING PLUGS FOR MOTOR CAR, MOTOR CYCLE & MARINE ENGINES. [Product Grid] TYPE G.1. G1. For average engines taking a 1/2-in. metric thread. 6/- TYPE G.2. G2. For average engines taking a longer thread, i.e., 18 m/m.{Mr Moon / Mr Moore} 6/- TYPE J.1. J1. For engines taking a metric thread 1/2-in., but where there is not room for protruding points. 6/- "G" plug in 3 sections. The insulated centre is sold as a separate unit. 3/- TYPE K.1. K1. Normal metric thread, but with triple points. 6/- TYPE G.3. G3. For American engines taking normal reach and 1/2-in. A.L.A.M. thread. 6/- TYPE G.4. G4. For American engines taking 1/2-in. A.L.A.M. thread and long reach. 6/- TYPE H.S.1. Type H.S.1. Two-stroke Plug. 6/- Spare H.S.1. insulated centres. 3/- TYPE H.S.3 PRICE 7/6 EACH TYPE J.L.B. Type J.L.B., metric reach 5/8-in, barrel 1-in. 7/6 Type E.L.T., threaded 1 1/4-in. 7/6 [Main Text] THE range of models illustrated on this page has now been proved by over five years’ experience to meet the requirements of all engines in general use. With the exception of the Ford Model all incorporate the original and well-known characteristics of “K.L.G.” design being of three-part construction—detachable—rust-proof—and provided with standardised renewable centres. This range consists of five main types, designated by the letters “G,” “J,” “K,” “L,” and “H.S.,” and these types are further classified by numbers denoting the length and form of thread. Broadly speaking, the “G” types are suitable for the majority of side-valve car engines and the earlier motor cycles. The “J” type for o.h.v. car engines of modern design, and modern touring motor cycles. The “L” type is similar to the “J,” but is to be preferred when trouble from oil or carbon is anticipated. The “H.S.1.” type is particularly designed for modern motor cycles and small sporting cars. The “H.S.3.” is a further development of the “H.S.1.” designed to meet more extreme conditions. The “K.{Mr Kilner}” series is similar to the “G.{Mr Griffiths - Chief Accountant / Mr Gnapp}” for purposes where three points are preferred to a single point. The "H.S.4." is similar to the "H.S.1." except that it is provided with a longer barrel to suit certain engines. The “J.L.B.,” “J.L.T.,” and “E.L.B.” are merely variations of the standard design to meet peculiar engine requirements in length of barrel and thread. The “G.{Mr Griffiths - Chief Accountant / Mr Gnapp}” type being the most suitable design for American engines is provided with standard American thread in types “G.3.,” “G.4.” and “G.12.” It must be realised that the choice of the correct design for each engine is a matter of first importance in order to obtain the best results, and this brief indication should be checked whenever possible by our list of recommendations on the back hereof. [Ford Model Section] THE NEW "KLG" FORD MODEL The Spark where the Spark should be WE WOULD NOT HAVE COURTED PREJUDICE IN ADOPTING THIS NOVEL DESIGN UNLESS WE WERE SATISFIED THAT THE RESULTS ARE REALLY REVOLUTIONARY K.L.G. Plug. “FORD” 4/- THIS is an entirely new “K.{Mr Kilner} L. G.{Mr Griffiths - Chief Accountant / Mr Gnapp}” model, designed solely for use in the “Ford” engine. As is generally recognised, this engine differs in its requirements from the normal engine, and presents peculiar difficulties in the matter of sparking plugs. In this design, the actual sparking-points have been carried right into the combustion chamber, thus ensuring exceptionally easy starting and slow running. The insulating surface which is exposed inside the combustion chamber is in the form of an annular ring, similar to that commonly used in porcelain plugs, but formed in mica sheet, and therefore the common risk of cracking is eliminated, and the plug is rendered exceptionally free from sooting or oiling up. The projecting mica insulation is further perfectly accessible for cleaning without the necessity of dismantling the plug, while its position in the combustion chamber exposes it to the maximum of heat. [Diagram annotations] - Surface of mica entirely exposed and therefore readily cleanable - Small mica skirt from which deposit burns off. - Sparking points projecting well into combustion chamber. PRICE 4/- THE ROBINHOOD ENGINEERING WORKS LTD. PUTNEY VALE, LONDON. S.W.15. Sole Export Agents: S. SMITH & SONS (M.A.) LTD. CRICKLEWOOD WORKS, CRICKLEWOOD, N.W.2. [Footer] REFER TO CHART OF RECOMMENDATIONS PRINTED OVERLEAF. | ||