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).
Failure of Champion LB.9 spark plugs after 719 miles and reverting to K.L.G. plugs.
| Identifier | ExFiles\Box 162\3\ img067 | |
| Date | 1st March 1937 | |
| 6000 Lillie Hall to W. Rm{William Robotham - Chief Engineer}/Wst. RC{R. Childs}1/L/1.3.37. Champion Plugs - LB.9. - - - - - - - - - - - I am returning herewith the 6 Champion LB.9 plugs which you sent us. The above plugs were fitted to B 2 GA and they have covered 719 miles. There was a bad miss and we found that the plug in No 6 cylinder was dead. We are now back on K.L.G. plugs. Straight petrol has been used during this mileage. RC.{R. Childs}✓ | ||