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).
Why Delco hydraulic shock dampers operate without a filter.
| Identifier | ExFiles\Box 179\2\ img062 | |
| Date | 4th December 1931 | |
| To Da.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 3/AD4.12.31. X235 HYDRAULIC SHOCK DAMPERS. With reference to Da{Bernard Day - Chassis Design}2/Mll.12.31. we consider that the reason why Delcos could do without a filter was because they had no small air vent hole to be blocked up, the clearance round the piston presumably providing for this, also that the seats of the valves were vertical so that foreign matter could fall off. Furthermore, the body being of cast iron, there was less likelihood of foreign matter being hammered into the seats as at present should it by any chance get under the valve heads because the seats are knife edged. We see no reason why if we can be like Delcos in these particulars, we cannot do without a filter, and we are sure that if they are still making dampers without a filter they cannot have found this necessary. However, I shall be able to bring the latest information back from the States when I go over there in the New Year. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||