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).
The 4000-mile test of controllable shock dampers for a 22-EX chassis, detailing specifications and issues encountered.
| Identifier | ExFiles\Box 16\5\ Scan133 | |
| Date | 2nd November 1933 | |
| File No 20. 2.11.33. CONTROLLABLE SHOCK DAMPERS - 22-EX CHASSIS. This car has now run 4000 miles with the following specification:- Dampers. Standard dampers to LOP.F.84936/7. No leaks in the pistons. Valves and Valve-chambers to Hs.{Lord Ernest Hives - Chair}1154. Valve spring F.100914 - 273 rating. Bellows control to RR.Sch.284. Minimum ball pin load 20 lbs. Pipe Lines. Copper .250" outside diameter. Luvax olive type joints. Governor Unit to frame pipe to RR.Sch.418. Governor Unit to N.Sch.3640. Main oil release valve to prevent over loading the bellows to Hs.{Lord Ernest Hives - Chair}770, set at 30 lbs/sq.in. Bore of pump .656" diameter. Controls. Governor unit over-riding control connected to the mixture control on the top of the column (temporary scheme by RHC.{R. H. Coverley - Production Engineer}) Carburetter mixture control operated by starter carb. control (temporary scheme by RHC.{R. H. Coverley - Production Engineer}) ---------------- During practically all this mileage, the over-riding control has been in the maximum position. The following troubles have appeared:- (1) After 350 miles the steel insert in the O.S. front damper valve-chamber became loose. The inserts on all the dampers were then brazed into the valve-chambers. No further trouble has developed. On the production scheme the valve seat and the valve chamber are one piece. | ||