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).
Magneto endurance tests, comparing contact point materials and discussing solutions for carbon dust accumulation.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan211 | |
| Date | 16th December 1929 | |
| EPCL/A16.12.29 contd. -4- points indicated negligible wear. This result is certainly remarkable and considerably better than those normally obtained with the standard iridio platinum points”. In addition to the above we have also obtained spare contact breakers for these machines, fitted with tungsten points. The results of tests of these on magnetos on chassis test will be closely watched. A similar endurance test on the other machine with larger platinum points is at present in progress. A point we have noticed in the course of these endurance tests is that it has been necessary, to avoid misfiring, to clean out the distributor after a few thousand miles on account of accumulation of carbon dust. Most manufacturers of chassis magnetos for instance, Bosch, Lucas, M.L. Scintilla and B.T.H. now fit jump spark distributors to avoid this cleaning process, and it is our intention to approach Messrs. North to ask them to submit an experimental magneto fitted with a jump spark distributor. At the same time we are taking up with them the point referred to in report WD.{Mr Wood/Mr Whitehead}99. of the ventilation of the space in which the safety gap operates. Speaking generally, we are satisfied with the progress we are making in conjunction with Messrs. North | ||