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).
Report of inspection and test of electrical units taken from vehicle 79-AO after a 10,000 mile test.
| Identifier | WestWitteringFiles\K\November1923\ Scan19 | |
| Date | 7th November 1923 | |
| EFC4/T7.11.23. REPORT OF INSPECTION AND TEST OF ELECTRICAL UNITS TAKEN FROM 79-AO AFTER 10,000 MILE TEST. All the parts of the electrical system have been examined, and where necessary tested, with the following results :- IGNITION SYSTEM. Ballast Resistance. With the exception of a slight corrosion of the spring washers on the terminals, the condition of this is O.K. Ignition Coil. The condition of the coil both on inspection and test is quite satisfactory. Some fraying has occurred on the rubber washer on the H.T. terminal. Condenser. The condition of the condenser on test is also quite satisfactory, though the capacity at 19°C was found to be at the lower limit. Contact Breaker Mechanism. This was found to be generally in order. The rubbing block was found to be slightly lubricated. The wear of the rubbing block, reckoned as the difference between its present dimension and the average of four new blocks, was found to be .005" only. There was no suggestion of rust on the cam. Contact Points. The condition is good, though they were found to be rather dirty, which dirt however was easily removed on being cleaned with petrol. The surfaces of contact are flat and meet together flatly. It is satisfactory to note that the pip on the one point and corresponding hollow on the other, which we have sometimes experienced, is entirely absent in this instance. H.T. Rotor Blade. This is sufficiently burnt away to form a flat on the periphery at the point where the spark takes place, and appears rather dirty. The question of the purity of the material of this rotor blade is at present being improved. Distributor Head & Sparking Points. There seems to have been some amount of oil vapour present in the distributor head which has been deposited on the central carbon brush. The sparking points are slightly pitted, but there are no signs of corrosion. Contd. | ||