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).
Ignition distributor failures on the Phantom III chassis and proposing modifications to the distributor head moulding.
| Identifier | ExFiles\Box 168\3\ img061 | |
| Date | 21th January 1939 | |
| c. Rm.{William Robotham - Chief Engineer} 61.4. DA.{Bernard Day - Chassis Design}5/G.21.1.39. PHANTOM 111 - IGNITION DISTRIBUTOR. Some ignition distributor failures which have been reported recently on the Phantom lll chassis, have been traced as being caused by spark tracking between adjacent plug lead terminals, on the inner surface of the distributor head. Herewith a scheme D.CD.1152 showing some alternative modifications to the distributor head moulding and terminals, any of which would be expected to obviate this type of failure. We think that the modifications shown in Section D1 - D1 represent the best solution to the problem since a maximum increase of 94% in the surface distance between adjacent terminals is obtained over the existing moulding D.74805, together with a fairly simple moulding form and terminal. We appreciate, however, that some difficulty might be experienced in moulding the head if the terminal shanks were to be kept free of moulding material, but if this is so, see no reason why the die should not be made to allow the terminals to be completely encased in a thin layer of moulding material. This would give the incidental advantage of a further increase in the surface distance between adjacent terminals. We suggest that as the modifications shown in D1-D1 can be applied to the existing moulds, we might experimentally make a sample head. DA.{Bernard Day - Chassis Design} | ||