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).
Increasing gap size of K.L.G. I7I sparking plugs in a Phantom III engine after mileage.
| Identifier | ExFiles\Box 142\3\ scan0149 | |
| Date | 3rd March 1937 | |
| WST 443. 12.04 HOTEL DE FRANCE. CHATEAUROUX. Indre. France. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW{Ivan M. Waller - Head of Chateauroux}/4/JAB. 3rd March 1937. To. Rm.{William Robotham - Chief Engineer} C. Ray GWH.{George W. Hancock - Head Chateauroux} 35-EX. PHANTOM III. K.L.G. I7I Sparking Plugs. These plugs were supplied and fitted at Derby and are of the new type with "corundite" (?) insulators. They have covered 9.000 miles since fitting and the gaps were found to be from .035" to .040" with one at .048". The gaps at 3.200 miles were :- .025" - .030". The points do not appear sufficiently burnt to account for so large an increase in the gap, in fact they are in good condition. It is almost certainly due to the bent wire straightening out under the alternate effect of heating and cooling. They have been reset at .020" - .025" for further running in the engine. ----------- R.S. Please note & return Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW.{Ivan M. Waller - Head of Chateauroux} Ian A.{Mr Adams} Walker. OST They do not state whether any misfiring occurred with the large gaps. W.A.H. | ||