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).
Design improvements and various ideas for carburation.
| Identifier | ExFiles\Box 5\4\ 04-page211 | |
| Date | 1st February 1929 | |
| HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} +45060 RA/M1.2.29. S.S. & G4. RE. CARBURATION. X. 7080 X. 5080 19-XX has made me think that our old RR. carb. is better than I gave it credit for. At sudden full throttle it almost uncomfortably snatches at its load. Mr. Lovesey's ideas however agree with ours. E.{Mr Elliott - Chief Engineer} and I have studied this matter many times, and with the same conclusions, and all the suggestions given in Mr.Lovesey's memo, except the series of the high and low speed thorads. We never thought of this because I have always been keen to add to the air passages through the carb. - i.e. low speed jet, plus high speed, plus extra air, all in parallel i.e. the areas adding together. I fear we should not gain anything by the series arrangement, but we can have a provisional patent for it. The emulsion jets also reduce the possibilities of adding more air, and seem to lose what is gained. In a new carb. we were anxious to avoid the stepping over from low speed jet by keeping the suction constant as in RR/28. which you have to test with the modifications in dimensions, which were evidently wrongly instructed at first. I am anxious to take advantage of : (1) The throttle edge carburation. (2) The very easy step over to the main jet. (3) The submerged restriction expanding with the air.passage (4) so that we can use an emulsion jet. The apparent complication of this will fadeaway if it does the work really better than any other scheme, and avoids double carburetters, which are often troublesome. Most of its complication is for easy cleaning and non-spilling properties. However it should be tested out when time permits, but it is so near testing that it would be foolish to let it rust away. The double butterfly valve scheme we thought nearly as complex without the advantages we were after. R.{Sir Henry Royce} | ||