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).
Confirming a discussion and outlining proposed modifications for a carburetter and induction pipe.
| Identifier | ExFiles\Box 85\4\ scan0015 | |
| Date | 20th February 1933 | |
| X208 To Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} c. By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Mths.{Reg Matthews} E.2/HP.20.2.33. Carburetter and Induction Pipe. Confirming our discussion of this morning, it is agreed that we do not see any immediate prospect of achieving good distribution and consumption with a depression as low as that reported on the last induction pipe tests, namely, 1-1/4" of mercury, and that we immediately re-test the pipes we are considering to be brought up to the standard of 2" of mercury by artificially depressing the air valve or other suitable means. The carburetter being used on the bed at the moment is one made up of the final throttle uptake shown on LeC.3325 combined with the Air valve chamber LeC.3122 J.3. carburetter having old condensed short choke. The choke should be as shown on the first named drawing LeC.3325 to piece No. E.101027. The change in this choke during the experiments on the J.2. carburetter was reported to make more improvement than anything that was done in modifying the pipes. (1) We are also proposing to try a shuttle shaped baffle in the uptake to throw the wet mixture off the front wall of the pipe. (2) Running with the throttle disc opening the other way round. (3) An alternative form of pipe with the uptake arranged to join on to the manifolds on the inside, more like a weir pipe. We are looking into this at the moment. (4) The improved choke mentioned earlier on in this memo. (5) 1.5 dia. uptake in place of the 1.625" at present on test, the object of this alteration being to bring the induction pipe depression up to the standard required, starting from the chokes, and to improve the balance and distribution of the mixture in the uptake. Further drawings and instructions will be supplied wherever necessary for the above items. E.{Mr Elliott - Chief Engineer} | ||