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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).
Adoption of drilled HP shock absorber valves and the lubrication of Phantom I springs with grooves.

Identifier  ExFiles\Box 67a\2\  scan0244
Date  9th November 1929
  
*8410.
x8410.
x8520.
x8980.

Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Sa.
C. R.{Sir Henry Royce} MOT.
C. Rg.{Mr Rowledge} Ds.
C. Ey. FD.{Frank Dodd - Bodies}
C. C. TC.
C. ILR. C.
--------------------

Ha/Smi/AM.9.11.29.

Adoption of drilled H.P. shock absorber
valves and Lubrication of Phantom I springs with grooves.
----------------------------------------------------------

We have been working in conjunction with the
Repair Dept. on this problem. We find that the lubricated
springs alone are not a complete cure. Unless we fit the
american setting for shock absorbers in conjunction with
these springs, we do not get the best results.

We have tried a great number of loadings and
have come to the conclusion that for the average heavy closed
car driven at slow speeds the best loadings are

Front. Up 120
Down 120 (one .055 hole in each H.P. valve.

Rear. Up 60
Down 120 Two .055 holes in each H.P. valve.

The main leaf and the two longest subsidiary
leaves are drilled and grooved for lubrication as on Phantom II.

The most difficult cars to deal with are light
fabric bodies of maximum capacity. A full petrol tank and
the equivalent weight of a spare wheel at the rear is the
best condition we know of.

Hs{Lord Ernest Hives - Chair}/Sa.
  
  


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