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).
Modification to hydraulic shock dampers to eliminate a hydraulic knock.
| Identifier | ExFiles\Box 55\4\ Scan013 | |
| Date | 9th February 1927 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Sft{Mr Swift}/Mr.Brock. X235. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/LG9.2.27. HYDRAULIC SHOCK DAMPERS. ======================== We find that in order to eliminate a hydraulic knock in the shock absorbers, it will be necessary to increase the size of the hole in cap F.74642 to .024" dia. (Morse drill No.73). We recommend that all shock dampers at present made and available should be modified to this dimension. To avoid the time element with this size of hole and enable a static low pressure reading to be taken, it will be necessary to screw the non-return ball valve on to its seat when actually checking the low pressure load. This ball valve should be restored to its standard condition before the damper is fitted to the car. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||