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).
Comparative analysis of different shock absorbers, focusing on performance, oil leaks, and overheating issues.
| Identifier | ExFiles\Box 44\5\ Scan117 | |
| Date | 25th September 1925 guessed | |
| contd :- -2- DERIHON. (1) Cooling water on n/s absorber 15 mins. run. Did not lose efficiency and oil leaks almost negligible. )2) No cooling. 15 mins. run - n/s absorber. Efficiency lost but not as much as on longer run. Probably due to the absorbers not being up to par to begin with. General notes. The Berkshires are better than the other makes for valve adjustment - the D.N's being worst in this respect. The Houdailles are less leaky and return to normal better than the others when cooling down. We think that on the road over-heating would not be as bad as on the bump nor oil leaks so serious. It is probable that oil leaks are partly caused by the expansion of the oil due to over-heating. Slight oil leaks should be of little consequence in service providing there is an ample supply of oil - the reserve chamber. It is open to doubt however whether, when the absorber is in action, if the reserve oil can pass the ball valve in opposition to the oil pressure in the working chamber especially if over-heating has taken place. This is rather borne out by the fact that refilling the reserve chamber and then working the arm does not improve the efficiency of the absorber although leakage has taken place. It would appear necessary to refil by means of a grease gun. Hs{Lord Ernest Hives - Chair}/RB.{R. Bowen} | ||