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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).
Technical note on testing different choke and venturi combinations.

Identifier  ExFiles\Box 179b\2\  img214
Date  24th December 1932
  
-2-
He/SWdL.{Len H. Swindell}6/24.12.12.32.

When using the original choke (Z.100660) which has a taper of 3°-40', there is a slight loading up.
We have tried a Venturi 'b' (V.1456) which has taper sides of 3°-40' and in conjunction with a 1.625 diam. parallel sided throttle body there is no trace of loading up, this combination having a free area between the throttle body and the Venturi of 1.49 sq. in.

We still have tests to carry out to determine the most suitable size of venturi.

He/SWdL.{Len H. Swindell}
  
  


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