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} | ||