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).
Comparative analysis of expanding and static type car carburettors to improve performance.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan073 | |
| Date | 28th January 1929 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. SG.{Arthur F. Sidgreaves - MD} c. to Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}/ACL1/LG28.1.29. X8080 X3603 CAR CARBURETTERS. At one time and another we have tested out various carburettors on our cars with the object of finding out the possibility of improving the performance of our own carburetter. Broadly speaking the comparison has been between two types of carburetter - expanding carburettors of which we take the RR. as the outstanding example and static carburettors represented by Solex, Stromberg and Zenith. We have always favoured the expanding type and the RR. carburetter has stood the test of time and for all its limitations we have been unable, up to the present, to substitute a static carburetter which would give such a good aggregate performance as the 40/50 RR. Certainly our recent tests have shewn that the Solex carburetter approaches the RR. carburetter in performance nearest of all the static carburettors we have tried. (see separate appended report for Solex tests). While engaged on these comparison and the development of our own carburettors, it is interesting to consider the suitability and limitations of each type for the particular duty they have to fulfil on our cars. In making this general analysis we are able to see the possibility of what we think an original form of expanding carburetter which really amounts to a development of our Phantom carb. with applications from our aero carbs. Dealing firstly with the advantages possessed by the static carburetter we may say :- contd :- | ||