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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).
Notes on carburetter design issues including sandwich casting, aneroid locking, plugs and throttles.

Identifier  ExFiles\Box 31\5\  Scan274
Date  11th December 1934 guessed
  
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which S.U. will arrange, and this will be an advantage in giving a slower lift to the cam itself.

(7) Sandwich Casting.

It is considered impossible to do without the sandwich casting owing to the facilities required for assembling the floatchamber, and also the use of this casting enables the carburetter to be treated as an independent production unit which can be tested for uniformity on the blower. To avoid the complicated coring on this casting however it is proposed to open out the cavities from the top face so that these will be left in the casting itself without independent cores.

(8) Aneroid Locking.

S.U. will dispense with the anchorage on the bottom end of the aneroid spindle, and use two dowel pegs to stop the larger locking nut from turning, in which case this latter piece will become a round disc, and the aneroid will then be adjusted by a second locking nut and a square on the spindle. It is agreed that the type of aneroid spring employed shall not be altered.

(9) Sticking of pressure aneroid.

Owing to the construction of the carburetter the pressure aneroid is at present 1 1/8" lower than it really need be, and this overhang increases the friction on the upper guide due to any eccentricity in manufacture. S.U. will consider using a cylindrically extended lower cover to raise the capsule up close to the guide, and an internal down looking boss to maintain the adjustment within reach.

(10) Plugs.

It is anticipated that the trouble with plug seizing will be eliminated by the use of magnesium for the main castings, in which case Dural plugs can be retained.

(11) Oil through Throttles.

As the temperature difference in the oil as measured
  
  


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