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).
Design changes and die-casting methods for cross web pistons for the 20 HP engine.
| Identifier | ExFiles\Box 105\2\ scan0166 | |
| Date | 22th December 1927 | |
| X. 5040 BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} c. to BJ. Hs.{Lord Ernest Hives - Chair} E1/M22.12.27. INDIA PISTON. We send you herewith LeC.2500 shewing the cross web piston for use in connection with the latest 20 HP. developments. Owing to the change in the piston pin we call for a reduction in the length of the little end of the conn. rod so as to leave more bearing surface for the piston pin in the piston. With regard to the locking rings for g holding in the piston pin we fear those shewn with two grooves may not get put in in the position intended, and we have therefore arranged LeC.2500 with one groove only, and a turned in end on the spring ring for extracting purposes. We propose to take this point up with R.{Sir Henry Royce}, and shall be glad if you would return two blue prints of this drawing to us instead of the usual one. Referring to BY4/G15.12.27., in connection with die-casting pistons, the construction we had visualised for the die was that each section of the metal to be withdrawn should be brought independently right outside of the piston, the sections being located and fastened together entirely outside as shewn roughly in the sketch - SEE ORIGINAL FOR SKETCH. If this is done there is some chance of withdrawing the outer sections after the centre one has been removed. We should like to know if this is considered a possible way of treating the die as it appears to be the only way in which we could die-cast these cross web pistons. E.{Mr Elliott - Chief Engineer} | ||