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).
Test results for different ignition contact point configurations, specifically anvil thickness and distributor setup.
| Identifier | ExFiles\Box 35\6\ scan 376 | |
| Date | 12th December 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Ev.{Ivan Evernden - coachwork} Wor.{Arthur Wormald - General Works Manager} X2894 EFC5/T12.12.27. IGNITION CONTACT POINTS. X8692 At the end of our EFC5/T29.11.27 we remarked that we were running the combination of scrubbing action and no distributor. The type of scrubbing action run on this test is the one referred to in EFC1/T24.11.27 as the scrubbing scheme we had arranged previous to the receipt of LeC.2461. It will be remembered that we obtained a result with that scheme (other things being standard) which we could consider equally good with that obtained with LeC.2460. In the sample now sent you the scrubbing scheme has been run without the distributor and it will be noted that this is very good, though I doubt, by comparing this with the previous case, whether we can assign any of the goodness to the fact of having been run without the jump spark distributor. The other sample sent to you is a case of one run to LeC.2460, but with a thicker anvil as desired in your R3/M22.11.27, the anvil being .080" thick. This was one of the two thicknesses called for on LeC.2460. (It will be noted that with this thicker arm the result is not as good.) Subsequently we have asked also in accordance with your R3/M27.11.27 for a thinner anvil than the normal .064" which was used on previous results which have been sent to you to date. We have asked for this in .050" material, but in this case, owing to the thinness of the material for screw thread for the point, we have asked for it to double just where the screw point is to be carried. | ||