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).
The performance and durability testing of Lucas magnetos, comparing tungsten and platinum contact points.
| Identifier | ExFiles\Box 40\2\ Scan244 | |
| Date | 24th January 1928 | |
| -6- Contd. of the remainder which were tested, showed a considerably less good retard low speed performance. We do not see good reason for easing our production test specification, as we find that the Lucas machines will pass this without particular difficulty, at the same time as being quieter, and being, so far as our own 10,000 mile tests go, and also according to Messrs. Lucas themselves, of good durability. In addition to the 10,000 mile test of the Lucas magneto (on your chassis 7-EX reported under cover of EFC2/T24.1.28, we have another machine which has done 8,000 miles satisfactorily on 10-EX, and this is still quiet after this mileage, and there is no complaint of it on any score. This was the machine, the running of which was shown to Mr. North. It will be remembered that the latest Lucas machine which we have had, including the one fitted to 10-EX, are fitted with tungsten contact points, whereas the contact points of all the EW6 magnetos so far are platinum. There is some little doubt as to whether the platinum contact points on the EW6 magneto will be durable, and we are putting in hand an endurance test of one of these machines run at 1450 r.p.m. E.F.C. EFC. | ||