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).
Results of various tests conducted on magnetos, noting wear and performance issues.
| Identifier | WestWitteringFiles\I\July1922\ Scan124 | |
| Date | 1st July 1922 | |
| Contd. -6- EFC1/T31.7.22. towards the end of the test on 5.5 mm. gaps. There was rather heavy tracking in the distributor, and the contact breaker lever red fibre block had worn about .005". On the ELO.6 there was fairly heavy tracking on the distributor and there had developed a black mark on each segment corresponding to the position of the distributor brush at retard. Particles of carbon dust were noticed in the bottom of the distributor. There was further^a carbon deposit on the earthing brush behind the contact breaker. The brushes appeared to be too soft. There were particles of red fibre rubbing block left on the cams. In all other respects the two magnetos ran very well. (8) & (9). These tests consist in taking the open circuit volt-speed and short circuit ampere-speed curves of the magneto primary, the results of these being exhibited on the accompanying photostat, which results may be compared with similar curves for other Bosch magnetos, issued with our EFC4/T5.2.21. (10) The short circuit test in which the magneto is run at 1500 R.P.M. for half a minute with timing lever central and secondary winding short circuited was O.K. on the two Watford machines. Omitted on Bosch. (11) The open circuit test in which the machine was again run at 1500 R.P.M. for half a minute with the timing lever central, and with the high tension terminal not connected to anything, and so that the secondary discharge takes Contd. | ||