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).
Test procedures and specifications for a damper and governor control unit, including a pressure to road speed table.
| Identifier | ExFiles\Box 16\5\ Scan167 | |
| Date | 29th November 1933 | |
| -2- Hs{Lord Ernest Hives - Chair}/Les.l/KT.29.11.33. more float for the control spring F.85377. This is done by fitting a thicker alum. washer G.77634 in the control unit F.84996. The complete control unit is easily removed from the governor unit. TEST 4. With the control in the minimum position the following pressure corresponding to road speeds should be approximately obtained :- MPH. 10 20 30 40 50 60 70 80 Pressure .5 1 2.5 4.5 6.5 8.5 11.5 13.5 lbs/sq.in TEST 5. Control in the maximum position. Above 40 m.p.h. the governor does nothing. This is because a spring load ball release valve F.85473/4 comes into operation at 30 lbs/sq.in. pressure. Therefore at no time should there be more than 30 lbs/sq.in. in the system. This is necessary in order to prevent impossible damper loads, and straining the bellows in the dampers. TEST 6. Test for non-return valves in governor unit. Stop the rear wheels having run in the maximum damping position. A pressure of 25 lbs.sq.in. should be maintained. If this falls quickly, and there is no external loss of oil from the system, it is due to one of the valves leaking in the governor unit. A good set of valves will hold 20 lbs/sq.in. pressure after standing over night. Immediately the control is moved to the minimum position the pressure is lost. ------------ As the dampers with this system have a maximum ball pin load of, front 400 lbs. and rear 300 lbs. which is 4 times the load taken by the same damper without the control, special care is necessary to ensure that the dampers are dead tight on to the frame. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||