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).
Further tests of the 'SS' expanding carburetter on a Phantom engine.
| Identifier | ExFiles\Box 13\3\ 03-page077 | |
| 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 BA. BY.{R.W. Bailey - Chief Engineer} X7080 Hs{Lord Ernest Hives - Chair}/ACL2/LG28.1.29. 'SS{S. Smith}' EXPANDING CARBURETTER. X7080 We have had the opportunity of carrying out some more tests on the expanding SS.{S. Smith} carburetter. We regret the development of this carburetter has been retarded due to the more urgent work on the SS.{S. Smith} engine but have endeavoured to carry out tests with this carb. on a Phantom engine where possible. Our previous tests shewed that the induction pipe depression was much too high - being 5.7" Hg. at 2500 r.p.m. full throttle - which we attributed to the area past the restrictor at full lift being too small. It will be remembered our first tests were to prove the power capacity of the carburetter. Continuing these experiments on a Phantom engine we made a test of the power and depressions with the restrictor held rigidly at various portions of its lift. It was so arranged that the restrictor could be withdrawn to 1.4 from its closed position, or .4 more than its original travel. These results are shewn on appended curves which were conducted at 2500 r.p.m. at full throttle. The curves of depressions are plotted against area past the restrictor, as this is withdrawn from the choke and it will be seen that the depressions progressively fall as the area increases but the fall of depression is at a slower rate as the restrictor approaches the extreme travel. Even when withdrawn to 1.4" or giving an area of 1.710 sq.ins. (the same as past the free choke) the depression in the | ||