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).
Page from a report detailing comparative tests on ignition components like coils, condensers, and contact points.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 70 | |
| Date | 24th December 1926 guessed | |
| -4- Contd. Nos.7 and 8 were run with the finer primary coil, double ballast resistance and standard RR. condenser. No.14 was run with a previous standard coil, standard ballast resistance with condenser of double capacity (two in parallel). In regard to the details of the separate tests, the actual contact breaker levers and screws, duly labelled with their coloured Nos. are being sent to R.{Sir Henry Royce}, arranged on a string in the order to which they are referred, for his comparative inspection. In the tests there is no question of any effect due to oil vapour, such as we have sometimes obtained on the car and which causes really rapid deterioration of platinum points. It will be appreciated that each of the above samples has run for the equivalent of 10,000 miles so it is not a question of rapid deterioration of points. From the results, it is really difficult to draw any very definite conclusions, but it certainly does appear that the contact points of either platinum or tungsten run distinctly better on the Delco-Remy contact breaker than on our own. It was thought that this might have been due to the actual location of the contact points in relation to the cam and rubbing block, and that was the reason for having tried the other position of the contact points obtained by utilising rubbing blocks of the form contained on samples 1OP and 1OT. Contd. | ||