Rolls-Royce Archives
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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).
Report page detailing tests on plunger position and a sketch of an air silencer and de-tuning chamber.

Identifier  ExFiles\Box 13\4\  04-page065
Date  14th October 1932 guessed
  
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We then carried out a series of tests on the road and found that the best position of plunger 'C' in chamber 'B' was 3.5" to 4" from No.3 aperture in A.{Mr Adams} This position was then confirmed by running 20-EX on the dynamometer.

Our next job was to apply this principle and same capacity of tuning chamber to our semi expanding carb. in a more practical and productive manner, and an air silencer similar to the sketch below was made.

[Sketch annotations]
8"
1 1/8"
RING OF SMITHS AIR CLEANER WIRE.
42 AIR SLOTS.
3"
10"
5"
12 HOLES .5"
De-Tuning CHAMBER.
TO CARB
  
  


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