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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 cooling, bonnet ventilation and carburetion for the Spectre model.

Identifier  ExFiles\Box 173\1\  img030
Date  5th January 1934 guessed
  
reasonably warm. Could we see.
(a). If a warm intake air will improve matters
(b). How many loures have to be blanked off to raise bonnet temp appreciably
I am sure with the large Marston matrix that we are at present using we have a margin of cooling at top speed even without bonnet ventilation, but we may require the latter for idling.

With regard to SpectreCodename for Phantom III carburetion; if the Induction port centres are as on the Bentley I can see little chance of ever using a single carb without a long up take or down take and a very hot spot.
I'm sure it will be worth our while to reproduce exactly (by tilting the engine if necessary) the induction system that E has drawn for the SpectreCodename for Phantom III to make sure there is no snag.
I had anticipated carbs on one bank between 2+3 & 4+5 and on the other bank between 1+2 and 5+6. but E
  
  


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