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).
Issues with spark plug 'oxydisation' and fouling, sending samples for analysis.
| Identifier | Morton\M1.3\ img025 | |
| Date | 25th June 1925 | |
| TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} C to CJ. BJ. " EV.{Ivan Evernden - coachwork} FPG. " RM.{William Robotham - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} " PM. re. SPARKING PLUGS. (under separate cover) We are sending you herewith an old type Bosch sparking plug which we have been using for running the lighting engine here. This is the only kind of plug that will run in this engine without misfiring. We would like you to get the central electrode analysed, to find out what the material is, also the Lodge plug. Probably you will find them both to be of pure nickel. The trouble we still have with plugs is what we have called oxydisation, and which does not seem to be far from the truth. Now most of our trouble seems to be between this, oil insulating the points, and soot spoiling the insulation - i.e. if they do not get hot enough to burn off the oil and soot, it accumulates, but if the plugs get hot enough to burn off the soot, then a layer of oxide (or something) forms, which insulates the points. R.{Sir Henry Royce} [STAMP: RECEIVED 29 JUN 1925 HS{Lord Ernest Hives - Chair}] [Handwritten: 4878] | ||