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 testing of K.L.G. sparking plugs, finding that reducing the plug gap resolves poor running issues.
| Identifier | ExFiles\Box 162\5\ img008 | |
| Date | 21th May 1937 | |
| To Rm.{William Robotham - Chief Engineer} c. to Rm{William Robotham - Chief Engineer}/WSt. c. to Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} 6001b Rm{William Robotham - Chief Engineer}/WB.{Mr Brazier/Mr Bell}3/JH.21.5.37. K.L.G. SPARKING PLUGS. We have tested the sparking plugs which were returned from Sg{Arthur F. Sidgreaves - MD}'s. car as being poor for slow running. They were tried in GAE.20 which had the tappet clearance opened up to .010" in. and .015" ex. to give better slow running conditions. The slow running was good 4.5 M.P.H. steady, and was the same as that obtained by the cars own plugs of the same type. The returned plugs however missed badly on pick up, which was cured when the plug gaps were reduced to .020". These were previously .030". Tried at .025" there were no misfires full load. We would urge the necessity of these plug gaps being kept below .025" with the standard coil in order to avoid trouble. Rm{William Robotham - Chief Engineer}/WB.{Mr Brazier/Mr Bell} | ||