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).
Instructions for modifications to a governor tower and rotor assembly for an ignition system.
Identifier | WestWitteringFiles\G\June1921\ Scan3 | |
Date | 1st May 1921 | |
To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -2- E1/G4/5/21 Contd. be instructed in both materials. This drawing slightly modifies the top of the governor tower shewn on previous LeCs. Referring to the rotor, it is intended that the spark shall take place at the front end of the spark surface, and that the safety tail which prevents back-firing shall be in length half the distance between any two ^neighbouring points. The gap between the rotor and the spark points, as on other modern battery ignitions, is invisible, and it is intended to provide an open ring which can be slipped on in place of the moulding, and which has an internal diameter opposite to the rotor equal to the internal diameter of the circle of the spark points. By means of this device the running clearance can be set with feelers. After the spark points have been screwed into the moulding it is intended that they shall be just touched up with a grinding wheel until they conform on their inner sides to a standard diameter. The rubbing piece for the L.T. make and break rocker should be tried in Duck Bakelite with the cotton layers at right angles to the cam surface, and in the plane of rotation of the cam. E.{Mr Elliott - Chief Engineer} | ||