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 wear characteristics of different ignition contact point samples.
| Identifier | ExFiles\Box 35\6\ scan 224 | |
| Date | 31th December 1926 | |
| To OY. from EFC. c. to R.{Sir Henry Royce} c. to Ry. X2894 EFC5/T31.12.26. IGNITION CONTACT POINTS. X4275 x4682 Further to our report EFC2/T24.12.26 and with particular and further reference to Mr. Olley's note OY2/K-61126, our observations on the sample points sent by OY. are as follows :- Sample in Envelope I. These were platinum, run 600 miles presumably with MR. standard ignition. The characteristic effect of these points is that of the presence of a small amount of oil vapour. The characteristic effect when no oil vapour is present is that of the production of an elevation on the lever point with the corresponding depression on the screw point, but this does not occur so very badly as to necessitate attention to the points until after about 5,000 miles. It will be remembered that in our report EFC2/T24.12.26 all the samples described (with slight exceptions) have run 10,000 miles on the bench. Sample contained in Envelope II. The effect on these points is very similar to effects which we have had running tungsten points on our own ignition on the bench. Therefore it is, as we should have expected, under conditions as described by OY. Though not stated, we presume this was run on our own contact breaker, because we get decidedly better results than this Contd. | ||