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 for pressure control settings corresponding to road speed, governor valve regulation, and shock damper loads.
| Identifier | ExFiles\Box 16\5\ Scan189 | |
| Date | 5th June 1934 | |
| -2- Now the pressure corresponding to road speed can be checked. When the column control is in the minimum position these should be approximately :- _lbs/sq."_ _M.P.H._ 0.5 10 1.0 20 2.5 30 4.5 40 6.5 50 8.5 60 11.5 70 13.5 80 These figures are controlled by the governor valve F.84958. Incorrect governor range pressures are generally caused from friction in the governor mechanism. When the control lever is in the maximum position the pressure at 10 m.p.h. should be 25 lbs/sq.in. This can be regulated by varying the length of the control rods. The highest pressure recorded in the system at max. speeds, when the control is in the maximum position must not exceed 35 lbs/sq.in. This is regulated by the main release valve, F.85530. The causes of incorrect operation of the control system in the Experimental Dept. have been generally due to (1) lack of oil caused by a leak in the system, and (2) dirt under the valves in the unit. Whenever the system is disconnected, as when removing a damper, all the air must be expelled from the system. This is done by running the rear wheels when the control is in the maximum position, then removing the 2-B-A set screws D.70870 on top of the control end of each damper. _SHOCK DAMPERS._ These are set with an initial ball pin load of 30 lbs. both for the front and the rear, but when the control system is operating at maximum pressure, the damper loads are approximately 400 lbs. front and 300 lbs. rear. | ||