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).
Report page discussing compression ratios, piston rings, and experiments to mitigate torque reaction and vibration.
| Identifier | ExFiles\Box 125\2\ scan0013 | |
| Date | 17th October 1928 guessed | |
| contd :- -2- not too well with the Claudel. The compression ratio could probably be further increased without torque reaction troubles because the 116° camshaft drops the MEP. slightly at the lower speeds. We are experimenting on gas flow through valves. We have not had the overhead slot on this engine yet. (c) PISTON RINGS. We note your remark about these. Four pinned rings above the skirt, the bottom to be perfect circle. (d) TORQUE REACTION. Y500S / XLL012 Since semi elliptic cars seem better than std. for torque reaction, and the Chrysler fit a spring drive in their driven clutch plate, we have been trying to carry out some experiments to prove that if we cushion the torque we reduce the periodic vibration that only occurs at full throttle low speeds. We have not got very far yet because spring drives are not easy to rig up experimentally. We were trying to adapt one of the early type damped pendulum levers to the transmission but if we do we cannot get the movement we think we want. We have been trying softer couplings, the present standard Hardy which was evolved mainly on destructive tests is frightfully hard. Our results on the softer coupling are not very conclusive so far, we find the engine alignment makes an appreciable difference and are eliminating this factor and repeating the tests. With the rubber engine mounting we want some device which will give latitude for alignment. contd :- | ||