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).
The development and testing of an expanding carburetter on a Standard Phantom I engine.
| Identifier | ExFiles\Box 13\3\ 03-page112 | |
| Date | 21th October 1929 | |
| X.7080. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Ey. Hs{Lord Ernest Hives - Chair}/ACL1/AD21.10.29. R.R. EXPANDING CARBURETTER. Further work has been carried out on the R.R. expanding carburetter, and together with the later information we briefly relate the previous development. All the tests have been carried out on a Standard Phantom I engine using an overhead weir type induction pipe. The carburetter in its original form resulted in high induction pipe depressions at high speeds, but at low speeds - below 1500 R.P.M. - the depressions were lower, and power consequently higher, than with the Standard Phantom carburetter. A single reading taken with the restrictor withdrawn .4" more from the choke than its normal maximum amount, increased the power at 2500 R.P.M. by 16.4 B.H.P. Completely removing the restrictor gave only an additional .7 B.H.P. The next step was to make the choke larger and employ another restrictor which resulted in giving a free area of 1.95 sq. in. when the restrictor was withdrawn to its max. distance of 1.100". The choke area with the restrictor at full travel was now 14% greater than during the previous experiment. The induction pipe depression was now actually higher than previously with a corresponding reduction of pow | ||