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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).
Persistent water boiling issues in the 20/25 and 25-EX car models.

Identifier  ExFiles\Box 131\1\  scan0020
Date  1st September 1931
  
Sg{Arthur F. Sidgreaves - MD}17/El.9.31 contd.

-2-

Nevertheless there is something about water boiling on a car to which the ordinary motorist objects very strongly and certainly does not expect on a car such as the RR.

From what I understand the 20/25 is even worse than the 40/50.

You will understand that, whilst using my car over there, I had the bonnet ventilators fully opened.

I was hoping that the radiator with the new type tubes would have increased the margin to within a satisfactory dimension but, after seeing the reports of 25-EX, it appears evident that such is not the case and I should be glad to know what is going to be done to get this point right.

Sg.{Arthur F. Sidgreaves - MD}
  
  


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