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 design options for an EAC.14 engine induction pipe, comparing a high carburetter setup with a lower one.
| Identifier | WestWitteringFiles\R\January1928-March1928\ 21 | |
| Date | 17th January 1928 | |
| Ltr. from E.{Mr Elliott - Chief Engineer} Copy to HS.{Lord Ernest Hives - Chair} EAC.14. INDUCTION PIPE. X7070 X8070 The weir or slot type induction pipe at present being tested on an EAC.14. engine was designed as a test model of what we now know as EAC.10., and hence the carburetter is very high up, as in fig. 1. At the time this was drawn - 29/9/27 - the policy was to build EAC.14. to the specification we are now following for EAC.10. hence the question of designing such a pipe for EAC. 14. as we now know it never arose. FIG I FIG II Starting from first principles we believe a slot type induction pipe for EAC.14. should be made as in fig. 2., and this is what we are drawing at the present moment. A pipe like fig. 2. gave excellent results when slot pipes were first tested. Derby will be able to tell us, as they have made models of both patterns, which is to be preferred. A short vertical length of pipe can be inserted in fig. 1 to bring the carburetter down to the same height as fig. 2. We cannot see that there should be any advantage in the weir as compared with the slot underneath provided always that there is sufficient length of feed pipe between carburetter and manifold; we should rather expect some loss of power with the former. (1) | ||