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 design, materials, and manufacturing for engine components like cylinder covers and connecting rods.
| Identifier | ExFiles\Box 3\3\ 03-page076 | |
| Date | 1st January 1922 | |
| (2) [Handwritten]: Johnson & Pugh [Handwritten]: mr 9. Throttle lever bracket. Spray chamber on carburetter. - There are of course objections to the use of aluminium on the carburetter. [Handwritten]: mr 10. Cylinder covers. In the case of the last mentioned item an objection might be made on account of the possibility of leakage, but the shape of the part is such, being with-drawable up and down with no cores, that sound castings could most probably be obtained. [Editor's note: The typed word 'not' is struck through and the word 'most' is handwritten above it.] [Handwritten in left margin: 902] The connecting rods could be lightened by running the white metal into the big end of the stamping itself after it has been machined, copper plated, and tinned, thus saving the weight of the bush. This can be made a very satisfactory job. [Handwritten in left margin: 910] Again, the body of the connecting rod could be machined and using a chrome nickel steel forging the necessary strength may be obtained with about 1/16" thickness of metal. This would of course have more important effects than the saving of weight. [Handwritten in left margin: 909] The connecting rod might also be made of stamped duralumin; it would not be advisable however to adopt this metal without exceedingly lengthy tests as no data is to hand as to how far this metal is subject to fatigue and how far its strength is impaired by a rise in temperature. | ||