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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 unit design improvements, including carburetter accessibility, valve springs, and a new carburetter system.

Identifier  ExFiles\Box 4\1\  01-page279
Date  11th March 1938
  
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HS{Lord Ernest Hives - Chair}/RAG/1/W.11.3.38.

(R) ENGINE UNIT.

The [strikethrough] points where design can help us here are in improving the accessibility of the carburetters and the float chamber mechanism, because we have had repeated trouble with flooding, in the design of a valve spring which will give the required load for a reasonable stress, and by increasing the inertia of the crankshaft damper to that of the Phantom. We have a double valve spring which has been designed and looks promising, but we think we should also have a design for a single spring in case the double spring proves noisy as has so often been the case in the past.

Our development problems are to try and get a two-carburetter system which will work sufficiently well for a design to be proceeded with, to investigate why the pistons on 'B' block knock whilst those on 'A' block are silent, to cure the high speed overoiling on 'A' block, and to get a damper that will deal with crankshaft periods. With regard to carburation, one set up which we think might be worth design consideration is a double choke downdraught carburetter on the lines of that fitted to the Buick, disposed in the centre of the block, one choke feeding each bank of 6 cylinders. We are making a mock up of this.
  
  


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