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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).
Test report analyzing bonnet and radiator movement and noise during road tests under various conditions.

Identifier  ExFiles\Box 11\3\  03-page376
Date  1st July 1931 guessed
  
(2)

of noise came from the radiator hitting the bonnet. The radiator had no rapid periods. The movement was slower but with greater amplitude.

60 MPH. The bonnet movement horizontally was quick but of small amplitude, clearance between dash and bonnet did not decrease more than .040". The radiator movement was slower than at 40 MPH. with no periods.

2nd. Standard rubber connection from cylinder head to radiator removed, also unions, longer flexible rubber connection fitted using clips. Other conditions remain the same.

20-25 MPH. The bonnet movement horizontally was the same as 1st Test. There was more rattle from the bonnet caused by the swivelling action of the radiator hitting the front end of the bonnet. The radiator movement was 10% less than 1st test.

40 MPH. The same conditions of the movement of the bonnet as in 1st Test at 40 MPH.

The radiator movement endways was slower by 10%

60 MPH. The bonnet movement endways was similar to the first test. There was still the vertical movement.

The Radiator movement endways was decreased by 10%

3rd. Radiator fitted up with single stay tube to dash. Long water connection retained. Radiator controlled sideways by rubber blocks in cups and controlled endways by sorbo rubber pad fitted between the rubber blocks in the cups. The nuts just retaining the pads without compression.

20-25 MPH. There was only one sharp period endways of the bonnet. Clearance did not decrease more than .030". The bonnet rattles caused by the vertical movement was decreased by 75% on 1st Test.

The radiator was perfectly steady.

40 MPH. The movement of the bonnet endways considerably reduced. At worst period a clearance of .010" was left. General rattle was decreased.

Radiator movement sideways was very slow with hardly any amplitude, 50% improvement over 1st Test.

60 MPH. The bonnet movement endways was slower and free from periods. Vertical movement was less. The results were 15% better than 1st Test.
  
  


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