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).
Investigation into a knocking noise issue with the Watford Sleeveless Magneto Type EW6, involving component swaps and further testing.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 69 | |
| Date | 2nd November 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. Da.{Bernard Day - Chassis Design} c. E.{Mr Elliott - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} c. Ev.{Ivan Evernden - coachwork} EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL EFC4/T2.11.27. WATFORD SLEEVELESS MAGNETO TYPE EW6. Further to our report EFC3/T10.9.27, to which we attached copy of our letter (EFC1/T10.9.27) to Messrs. North, concerning the recent EW6 sleeveless magnetos Nos.99171 and 99802, we recently received a visit from Mr. North and he brought back with him magneto No.99802 which had been returned on account of the knocking noise reported. This magneto has been put on 9-EX in place of No.99171 which we have now back in our laboratory. We made some observations on the noise of No.99802 and this appears to be quite reasonable, but further observations are being made by the testers and we are expecting a report. Mr. North brought with him a set of differently shaped cams which had been made as a result of our recommendations that the rate of make might be much less than the rate of break. The magneto No.99171 which was removed from the car was reported to have suffered no particular change in noise of contact breaker since reported to you in our EFC3/T10.9.27. The contact breaker of this machine being noisy, it is our intention to carry out the experiment of changing the cams on this machine on the bench. It would appear that the noise defect of these magnetos is not very serious and I think we may consider that we have arrived at the stage when a further six magnetos should be ordered for further trial partly on experimental and partly on test cars, and also with the object of getting through a 10,000 mile test. EFC | ||