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).
Description of the carburetter control mechanism and the dry multiple plate clutch.
| Identifier | ExFiles\Box 127\1\ scan0035 | |
| Date | 28th March 1917 | |
| Contd. -4- It is fixed high up on an induction pipe which bridges across the space between the two blocks of cylinders. The separate sketch No.3 gives an idea of what the carburetter is like. There is a carburetter control dial on the steering column which is coupled up by a rod to the small cross shaft which carries the cam for adjusting extra air valve spring pressure and which rotates the shaft through about 90°. This little cross shaft is in turn coupled up by a rod and levers which form a toggle action to the spindle of the Butterfly valve which controls the main air supply. If one moves the control dial towards the "more air" position, the little shaft with the cam reduces the air valve in the main air/take. When about 75% of the movement of the dial has been made, the rod and lever which connect the cam shaft and the butterfly valve spindle pass the dead centre and the butterfly valve commences to close again, although the extra air valve spring is still being weakened. The butterfly valve can only close a little way after passing dead centre owing to the movement of the control dial having been all taken up. The carburetter works fairly well, but is far from being ideal. The petrol consumption appears to be heavy but no tests have been made yet to obtain correct figures. Clutch. The clutch is of the dry multiple plate type using asbestos fabric friction faces. It is very nice to use, taking up very sweetly and freeing itself easily when disengaged. We have not dismantled the clutch, but have looked into | ||