Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Modifications and tests performed on the car's suspension damping system.

Identifier  ExFiles\Box 18\3\  Scan186
Date  11th November 1930 guessed
  
-2-

The car was improved very considerably by these
modifications; but it was immediately noticed that the
rear springing was too effectively damped (no Hartford
friction damping was applied). The rear dampers were
then modified by drilling .032" dia. holes in the H.P.
valves. Very little difference was appreciated, and
further damping on the rear (applied on the Hartfords)
made the rear definitely harder. Pitching was only
slight, and was definitely improved by applying 15 lbs.
friction damping to the front of the car. With this
combination of front springing and damping the results
were encouragingly good; the front riding was very soft
(drilled valves) at low speeds and there was sufficient
damping to eliminate rear seat pitching.

The next test carried out was with no damping
at all on the rear, the front being unaltered. The
rear seat riding was very good except for very slow
bouncing of large amplitude at speeds over 35 m.p.h.
Damping was then applied to the rear (by Hartford) until
these movements were damped out, 50 lbs load was required
to do this without appreciably making the low speed
riding harsher.

The rear hydraulic dampers were then set at
60/60 lbs and connected up, the Hartfords were slacked
off altogether. This combination gave very good riding
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙