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).
Piston pin materials and oil flow, and an investigation into a burst cast iron flywheel on chassis 2100E.
| Identifier | ExFiles\Box 10\1\ 01-page53 | |
| Date | 12th August 1913 | |
| COPY. X685 August 12th. 1913. R5/P12813. E.{Mr Elliott - Chief Engineer} J.{Mr Johnson W.M.} Na.{Mr Nadin} Wor.{Arthur Wormald - General Works Manager} Re Piston Pins. I think it was found that the piston pins are made from cold rolled or cold drawn steel. This ought not to be used. Use hot worked metal and arrange for cut to be taken as suggested or allow enough for two grindings, one rough quick cut, removing metal quickly, to be taken before case hardening. Either way will please me. Also quite a long time ago I tried to arrange parallel oil flow along the pin instead of around the pin. Will you find out why this was abandoned?. Re burst flywheel on Chassis 2100E. Since we are now using so much higher engine speeds, it is a good thing we are fitting wrot. flywheels instead of cast. With reference, however, to the particular one broken on 2100E, I think this could not have been pure speed and weakness of the cast iron, but some other reason, which we ought to find out. For instance, it is stated that the clutch ring was of steel. Might it be possible that this clutch ring had been tightly fitted into the flywheel and caused an initial strain in the cast iron, or might it have been due to the fact that [Handwritten note in left margin, next to a circled 'Wor{Arthur Wormald - General Works Manager}'] This is, I think a most urgent experiment. Let me know what you propose to do. FHR 14/8/13 | ||