List of design instructions and modifications for various engine components.
| Identifier | ExFiles\Box 30\1\ Scan179 | |
| Date | 31th May 1935 | |
| (2) E {Mr Elliott - Chief Engineer} /Lid. {A. J. Lidsey} 1/HP.31.5.35. Spring Drive. To suit new slipper flywheel. Design instructions will be issued immediately - modification larger diameter. Connecting Rods. Strapped type connecting rods to be instructed subject to examination of the set which has been running on experimental engine which will shortly be stripped. Piston. This section to be held up pending further information from the Experimental Department. Cylinders. Cylinder liners to be as at present instructed, i.e. .275" longer cylinder liner in centrifuged cast iron, heat-treated Cylinder heads as at present instructed, but order 8 sets only. Valves and Fittings. To be suitable for double valve springs and 8 to 1 rocker ratio. Design instructions for this are completed, and issued. Inlet Pipes. These are to be to the latest design to suit the reversed throttle type of carburetter. Carburetter. Latest type with reversed throttle. Design instructions are complete. Carburetter Air Silencer. To be similar to what is being fitted to Spectre(Codename for Phantom III) 3 for 10,000 mile test. Design instructions will be issued within one week for felt linings. Camshaft and Bearings. To be as at present instructed experimentally, but 8 sets only of camshafts to be ordered and in Ubas steel. Dynamo and Drive. To suit the 1 1/2 times engine speed dynamo. Designs will be completed for these in one week. The dynamo itself will be the same machine as the Bentley ventilated dynamo. | ||
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).