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).
Performance of induction and exhaust systems, and proposed detonation tests for Bentley models.
| Identifier | ExFiles\Box 122\4\ scan0217 | |
| Date | 13th January 1939 | |
| 1036 Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} c. Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe} Rm{William Robotham - Chief Engineer}4/R.13.1.39. Your report on camshaft induction systems is very interesting. The performance of the Stromberg Induction System, particularly with a B.V. camshaft, is exceedingly disappointing. We should like to have an explanation as to why we are so much down in power, i.e., is it due to induction pipe depression, or some other reason ? Can we get our power back by using the Duplex Stromberg carburetter ? With regard to exhaust systems, we should like to know how we stand with regard to the latest Wraith exhaust system compared with the one which was fitted on first cars. The detonation tests which are at present being undertaken on the road to find out whether we can really go on 7 : 1 compression ratio on the standard Bentley V and get increased performance for a given degree of detonation should be carried out to a conclusion by trying sodium-cooled valves and improved water circulation. On the Continental Bentley. We might have to try to run on 8 : 1 compression ratio if we get reasonable results. Rm{William Robotham - Chief Engineer}, | ||