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).
Specifications and recommendations for shock damper settings and buffer to axle clearances.
| Identifier | ExFiles\Box 9\5\ 05-page244 | |
| Date | 4th April 1939 | |
| 2. ST/B.2/MG.4.4.39 (cont'd) to communicate with the .062" hole at right angles. The adjusting washers between the valve and the seating have .005" clearance. The best method of increasing the damping is to reduce the amount of leak. The front dampers affect pitching probably more than the rear, but there is a limit to which the front damping can be increased owing to torsional oscillation of the frame being brought up. The effect of this depends on the rigidity of the body and scuttle, and in some cases may not be at all noticeable. It is suggested that a reasonable compromise can be effected in cases of complaint of excessive flexibility or pitching by setting the shock dampers to:- Front Initial load 60 lbs. Leak hole in valves plugged up. if front end shake becomes noticeable, lift valves off seat by .004", using plain valves. Rear Initial load 40 lbs. Leak - one hole .031" dia. The standard buffer to axle clearances under normal load are:- Front. 1.225" (lower buffer) In practice, 7/8" to 1⅛" is permissible. Rear. 3.500". Limits 3¼" to 3¾". Unless the buffer to axle clearances are obviously wrong, no great advantage will be gained by changing springs. BY/JSG .S. The foregoing replies to Sr/VAD/ST.3.3.39 in connection with chassis WRB.69. | ||