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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).
Carburetter design possibilities, including issues with volumetric efficiency and float clearance.

Identifier  WestWitteringFiles\S\2April1928-June1928\  Scan015
Date  12th April 1928 guessed
  
(2)

It seems a little like the weir pipe making an untidy looking job, but I can only see the two possibilities.

Floats.

[Vertical text next to diagram]
Because float wide cyl. must clear jacket. bore

[Text in box on diagram]
Probably can be cut in.

We seem to have got back to your LeC. 2527., but so much of the carburetter uptake is in the cyl. block. Would that not heat the mixture too much and cause loss of volumetric efficiency? I realise it is a good place.

The other difficulty was thought to be the change for a vertical type carburetter which we hope to have ready by when the engine is running.

R.{Sir Henry Royce}
  
  


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