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).
Carburettor experiments, comparing a diffuser and a light aluminium air valve against standard components.
| Identifier | ExFiles\Box 5\4\ 04-page155 | |
| Date | 17th February 1926 guessed | |
| contd :- -5- show the relationship between specific consumption and mean effective pressure with varying mixture strengths for each carb. at 750 r.p.m. It will be seen that there is a very slight gain in power by the diffuser relative to the standard, but this amounts to less than 1 lb.sq.in., maximum power is obtained at about the same consumption but with the diffuser it is possible to get slightly better efficiency with weak mixtures. However, the gain in either case is very small. The metering characteristics of the diffuser carb. were not so good as the standard but as we are only putting forward power output results in this report we will give the other results - which form a complete series of experiments - in another report. 20 HP. CARBURETTER WITH LIGHT AIR VALVE. The carburetter fitted with the aluminium air valve gave no appreciable difference in power to the standard brass valve - as we should expect when considering the results of the other experiments. We are still engaged in working on this instrument with regard to the metering and its characteristics will be supplied in another report. SUMMARY. The experimental results give us the following information :- THROTTLE & INDUCTION PASSAGE. Increasing the size of these to 1.500" dia. does not result in an xxx increase of power relative to standard. contd:- | ||