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).
Tests to establish standard leakage times for front shock absorbers on various chassis.
| Identifier | ExFiles\Box 68\2\ scan0244 | |
| Date | 6th May 1929 | |
| RHF 5 x8520 May 6th, 1929. TO: Mr. Olley cc - Mr. Burton Mr. Ingham Mr. Bagnall Mr. Humpston Mr. Caswell Mr. Knapton Mr. Cotter Mr. Poole Mr. Ross Mr. Hives (Eng.) FROM: Mr. Fuller FRONT SHOCK ABSORBERS Section 7160 On Saturday, attempt was made to establish standard "leakage times" for front shock absorbers. The damper arms and anchorages were removed from two finished cars at the works, and from three chassis on final test. A special arm having a 9 lb. weight fastened to the ball end was then fitted, and the time taken for the weight to drop from the upper limit of its travel to the level of the bottom of the frame. Results were as follows:- Chassis 102-FR: Left Front: 5-2/5 seconds. Right " : 6-1/5 seconds. Valve A-12294 was fitted to the left front in an effort to bring the time up to that of the right front, but increased the time to 12-1/2 seconds. Another valve A-12293 was then put in, and brought the time to 6-1/5 seconds. Chassis 126-FR: Left Front: 4-2/5 seconds. Right Front: 5-4/5 seconds. At the first attempt at timing the right front, the instrument acted as though it had air in it. Investigation showed it to be nearly empty; 3/4 pint of oil being required to fill it. The filter was checked and found to be tight, so that we are rather at a loss to know how the oil escaped. The time given above was established after re-filling. Valve A-12294 was put in the left side, and brought the time up to 6-4/5 seconds. Chassis 183-FR: Left Front 6-3/5 seconds. Right Front 6-2/5 seconds. Chassis 184-FR: Left Front 6.0 seconds. Right Front 3.0 seconds. -continued- | ||