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).
Guide on adjusting shock absorber loads for low rating springs by modifying the H.F. valve.
| Identifier | ExFiles\Box 106\1\ scan0332 | |
| Date | 12th November 1931 | |
| C O P Y. To Hd.{Mr Hayward/Mr Huddy} for Depot Sheet. Ha/Ra.2/WJ.12.11.31. 25 H2. LOW RATING SPRING SHOCK ABSORBER LOADS. The shock damper for use in conjunction with low rating springs are all set to the same poundage front and rear, which is H.F. 115. L.F. 90. The effectiveness of the damper for various types of customer can be regulated by drilling holes in the H.F. valve. This should only be carried out at a Depot where a recognised shock absorber expert is available. Generally speaking, two standards of loading are employed - | Holes in H.F. Valve. | |---|---|---| | | Front. | Rear. | | Average | One .044 hole | Two .055 holes. | | Max. Softness. | Two .055 holes. One .052 hole. | Two .055 holes. One .052 hole. | If a customer considers the average loading allows too much spring movement it is permissible to reduce the size of the holes in the valve or even eliminate them altogether, but if this latter step is taken it will largely cancel the advantage of low rating springs. Ha/sn.{Mr Sanderson} | ||