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).
Test report comparing the performance of two different K.L.G. spark plugs.
| Identifier | ExFiles\Box 142\3\ scan0156 | |
| Date | 5th March 1937 guessed | |
| -2- K.L.G. 850 Present standard plug mica insulation. Plug gap .020" Slow running 7 to 8 M.P.H. Idling 350 -400 R.P.M. 450 R.P.M. fully advanced. Braked down to 7 M.P.H. full throttle no misfires. Top speed 90 M.P.H. 15 mins. idling no oil on plugs but running rather cool. K.L.G. FLB.50.X. Corundite insulation internal earth. Plug gap .020 Slow running 7 to 8 M.P.H. Idling 350 -400 R.P.M. 450 R.P.M. fully advanced. Braked down to 7 M.P.H. full throttle no misfires on pick up, plug gap opened out to .030. Still no misfires. Top Speed 90 M.P.H. 15 mins idling no oil but running rather cool. The objection to this type of plug is the internal earth which is easy to set when new but becomes increasingly difficult as the electrode wears. RM{William Robotham - Chief Engineer} / W.Brazier. W. Brazier | ||