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).
The performance and condition of K.L.G., Bosch, and Lodge sparking plugs after road testing.
| Identifier | ExFiles\Box 142\3\ scan0107 | |
| Date | 22th January 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/W.Brazier. c. c. to Rm{William Robotham - Chief Engineer}/Wst. 1204 22.1.37. K.L.G. CORUNDITE SPARKING PLUGS. We have fitted K.L.G. Corundite sparking plugs to the following cars - 35-EX. K.L.G.171 all cylinders, inlet and exhaust. 36-EX. K.L.G.172 " " " " " 37-EX. K.L.G.172 All cylinders, inlet. K.L.G.173 " " exhaust. ---------------- K.L.G.932 taken from 37-EX. These plugs have completed 7034 miles without complaint. The central electrodes have worn with a consequent increase in the spark gaps .005" to .008", but appear to be running at the right temperature. ---------------- Bosch W.145.T1. Taken from 36-EX. Lodge RL.14. The Bosch plugs have run 1344 miles and the Lodge 1522 miles without complaint. A fair amount of carbon on both types gives the impression they are running too cool, but the mileage has not been sufficient to prove their worth. ---------------- All the plugs have been returned to Rm{William Robotham - Chief Engineer}/Wst. for his report and examination. Rm{William Robotham - Chief Engineer}/W.Brazier. | ||