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).
Carburettor development, comparing single versus double carburettors, and suggesting tests for improved low speed torque.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan117 | |
| Date | 7th February 1929 guessed | |
| contd :- -5- working at a low induction depression and so obtaining such a marked gain in low speed torque. We certainly do not care for double carburetters from the point of view of extra complication and synchronisation but think there are definite advantages to be gained with regard to improved low speed torque and improved distribution. Any improvement in the latter naturally helps us to remove the complication of extra heating. Because these tests point out the advantage of low induction pipe depression we are particularly anxious to push along with the SS.{S. Smith} expanding carburetter but our immediate efforts we think must be directed to making the present standard system the best we can for production so, that we may have time to fully develop the SS.{S. Smith} expanding model. We feel sure the SS.{S. Smith} will permit us to obtain the low depression combined with reliable low speed pick up - which we are not sure of with static carburetters. The SS.{S. Smith}, by virtue of its vertical arrangement and semi diffuser type jet, should result in good distribution but we should very much like to try two carbs. of this type with each choke feeding three cyls. Such a test would indicate the effect on distrib-ution and if by this arrangement it became less dependent on heat. We also suggest as an experiment trying the Solex carb. on the SS.{S. Smith} engine and making a road test comparison in the same way as we have done on the Phantom, between this and our standard carburetter system. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey. | ||