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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).
Petrol flow issues with an SS Carburetter float chamber and the satisfactory test of a new needle.

Identifier  ExFiles\Box 13\3\  03-page105
Date  30th August 1929
  
x7080.

from Mx.{John H Maddocks - Chief Proving Officer}

Mx{John H Maddocks - Chief Proving Officer}9/T30.8.29

SS{S. Smith} CARBURETTER

As I have already reported to you verbally we have trouble on the dynamometer at maximum revs. in obtaining sufficient petrol flow passed the float chamber needle seating. We only just get sufficient flow if all the mechanism in the float chamber is correct, without taking advantage of the small limits.

I should like to make it quite clear to Hs.{Lord Ernest Hives - Chair} that this fault is entirely a float chamber trouble, and has nothing to do with the autovac supply.

We have tried out at your suggestion the two needles which you instructed with different seating angles, and the one with an included angle of 90° is quite satisfactory.

Mx{John H Maddocks - Chief Proving Officer}
  
  


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