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 details for road springs, aluminium pistons, and valves.
| Identifier | Morton\M22\ img030 | |
| Date | 26th November 1918 | |
| To BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} -5- R4/G261118 Contd. wheel carefully formed, and polished with fine emery cloth. (8) ROAD SPRINGS. X.2628. X 1295 X Regarding the road springs, I have written about these recently. I understand the rear ones will be over the axle, the longest leaf will be split in its rear end, and fitted on a roller having a collar. (9) PISTONS. X.2748 X.3400 It is assumed that we are testing aluminium pistons made in Mr. Hall's alloy, of the special design lately sent from here, which had the lower of the upper rings made into the scraper ring, so as to leave a full surface of the aluminium well lubricated. This piston demanded a shorter connecting rod, which we think will be found advantageous, owing to the fact that the thrust of the piston is brought to a diameter which should not change its dimensions nearly so much as in the case of the old piston. This lower part of the piston being extra well oiled, is expected to be free from wear. It will be as well to keep the connecting rods back until this piston has been tested, and for wear it can run a long duration test, half the engine being fitted with the next best piston, or one, the wearing qualities of which are known. (10) VALVES AND VALVE SPRINGS. X.2764. The valves are to be of the light type, and the valve springs giving ample pressure to permit the engine running up to at least 2500 before leaving the cams, as we have found that many (Contd.) | ||