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 wear of K.L.G. Corundite, Bosch, and Lodge sparking plugs after road testing.
| Identifier | ExFiles\Box 142\3\ scan0108 | |
| Date | 22th January 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/W.Brazier. 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.TI. 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. W. Brazier | ||