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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).
Engine overheating during hill climbs and the proposed solutions of changing gear or fitting a more efficient radiator.

Identifier  ExFiles\Box 24\4\  Scan012
Date  13th May 1914
  
R.R. 255a (150 H) (V.V. 374. 16-4-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0475.

COPY.

To Mr De Salamanca from R.{Sir Henry Royce}
Copy to J.{Mr Johnson W.M.}
Copy to Wor.{Arthur Wormald - General Works Manager}
Copy to E.{Mr Elliott - Chief Engineer}

x706

Very possibly, climbing, this year with the different car and engine, may result in staying on the third speed too long. This would cause boiling, as it is an impossibility to make any radiator which will not boil if you stick on a high gear until the engine and fan speed is slow. Therefore, whenever there is any trouble with boiling, change to a lower gear, when the engine and fan speed will increase, and probably stop the boiling.

We are endeavouring to make an arrangement in time, whereby you will lose steam only, under which conditions the boiling of the water will not be at all serious, as it will take a long time to boil away a gallon of water, i.e. to turn it to steam, because the latent heat carried away in the steam is 1000 units per lb., whereas by losing hot water you are no better off, and I believe that most (90%) of the water at present lost escapes as water, and only perhaps 10% as steam.

The radiator we have sent you is more efficient for its size than the one on the car according to our tests; also the one on the car may have some of the tubes not acting through being blocked up.

We are urging Works for a further supply of radiators for you to test.

R.{Sir Henry Royce}
  
  


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