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).
Alterations to the P.2. carburetter to prevent cutting out and advocating for the in-house development of double carburetters.
| Identifier | ExFiles\Box 13\3\ 03-page312 | |
| Date | 4th May 1931 | |
| X7080 Hs.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} EV.{Ivan Evernden - coachwork} } c. Sg.{Arthur F. Sidgreaves - MD} Wcr. E.{Mr Elliott - Chief Engineer} R2/M4.5.31. DOUBLE CARBURETTER P.2. AND J.1. X.7080 X.5080. The alterations to P.2. to prevent the cutting out effect and flooding at the corners has been completed with some simplification. This was surprising because so many carburetters must have this defect. No doubt the trouble was starving on one corner, and flooding on the other. The pump might also have cut out after once acting, but in practice this would not cause any trouble because one does not go on round and round sharp corners. The definite fault has done us good, and will be avoided in future. We want you to try the two hole scheme which we think is better and simpler than the slider when one wishes to completely close the throttle, as in our practice. We are greatly in favour of making our own carburetters because they are so connected with the whole intake system, heating, etc. (If we make any we should make all) Our old carburetter has done good work for R.R. reputation for 25 yrs. and is only now supplanted because we found the possibility of getting better results with double carburetters than with singles. The Exptl. Dept. had always a free hand to try every carburetter they could get hold of. Up to now we have not been able to get good enough metering for passable economy. Especially our big engine would cause complaints unless it could be run under all conditions at weakest maintained, we might soon have a consumption of 50% greater. We hope for a definite advance in power so that we may have 10% higher gear, which would help economy of fuel, and maximum speed (miles per hour), and also better slow running by throttle edge carburation. R.{Sir Henry Royce} | ||