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 testing and standardization of tungsten ignition contact points.
| Identifier | WestWitteringFiles\Q\2-July1927-September1927\ 98 | |
| Date | 9th September 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. BY.{R.W. Bailey - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} ORIGINAL TUNGSTEN IGNITION CONTACT POINTS. A standardisation sheet for tungsten points is now being circulated for signatures. We have received your telegram asking for further news. No. 27. Scrubbing action for tungsten points to LeC.2422, together with alternative springing but without damper. Points initially reasonably well bedded. The first test without damper has now completed its 10,000 miles run. This was the test concerning which we sent you the telegram at 5000 miles. The final result, though a considerable improvement over standard, is not quite as good as we anticipated from inspection at 5000 miles. There is, however, very little pip formed and there was no misfiring throughout the test. These points are sent for your inspection, labelled 27. They do not quite realise the greyish surface all over, which is characteristic of Delco-Remy running, and which suggests, though it may only be imagination, better performance. Though the lever point has a very good appearance, there is some amount of blued oxidation on the screw point which we would like to get rid of. A second test of the same description, but of a second contact breaker and running under slightly different circumstances has been started, and examination at 1150 miles shows these to be progressing at least equally well and probably better than the previous sample, of which the above is a report. No. 30. Delco-Remy lever and screw on RR. breaker. Points initially reasonably well bedded. Sample labelled 30 is the result of this test. Although not requiring any attention, the result is definitely inferior to No.27 above, and still more so to the result obtained on the Delco-Remy complete contact breaker. Contd. | ||