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).
Replacing K.L.G. 850 spark plugs with Lodge X.434/2 plugs, which caused audible detonation.
| Identifier | ExFiles\Box 162\4\ img098 | |
| Date | 2nd July 1935 | |
| S/W. To Hs{Lord Ernest Hives - Chair}/Wst. from Lp.{Mr Lappin} Copy to Wpr. V60010 Lp.{Mr Lappin}10/LAM.2.7.35. 4.B.IV. We have removed the K.L.G. 850 plugs from 4.B.IV. These have done 1,000 miles and the engine has never been free from misfiring since they were fitted. The Lodge X.434/2 plugs have now been fitted and detonation is now audible for the first time. We are sending the plugs for your examination. Lp.{Mr Lappin} Encl. Plugs. | ||