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 setting the magneto timing, detailing adjustments for retard and advance positions.
| Identifier | ExFiles\Box 65\1\ scan0180 | |
| Date | 29th September 1926 | |
| contd :- -5- Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG29.9.26 --------------- Having set the battery ignition, the magneto sleeve should be moved round to the fully retard position, and the magneto timed by means of the serrated coupling in proximity to the rear end of the dynamo. The correct timing for the magneto is 12º B.T.C. with the hand control lever in the fully retard position. One tooth on the serrated coupling alters the timing by 6º on the flywheel. It may therefore be impossible to set the magneto nearer than 15º B.T.C., or 9º B.T.C. In this case the more advanced setting should be chosen, otherwise it will be impossible to obtain the full range of automatic advance. This difficulty is obviated with a taper instead of serrated adjustment. This setting should be carried out with Rod E.72614 still dis- connected. The magneto being set as near 12º B.T.C. as possible with the sleeve up against the retard stop, the hand control should be moved to the top of the quadrant and the lever E.72614 coupled up and adjusted in length until the magneto points just break 20º B.T.C. In the extreme case of the magneto having to be timed 15º in the fully retard position, it may be found that in order to prevent lever E.72578 pivoting about the end of the Rod E.72587 when the flick start is being used, the Rod E.72614 will have to be lengthened slightly, making the final timing of the magneto with the hand control in the fully advanced position 21º or 22º B.T.C. Having this set the ignitions for the contd :- | ||