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).
Performance comparison between a standard carburettor and a diffuser jet carburettor.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan123 | |
| Date | 15th January 1925 guessed | |
| contd :- -5- diffuser high speed jet of the Claudel type. The free throat areas were the same as standard. The appended curves show the relationship between specific consumption and mean effective pressure with varying mixture strengths for each carburetter at 750 r.p.m. Graph Text: Title: COMPARISON OF STD CARB. & DIFFUSER JET CARB. Subtitle: 750 R.P.M. FULL LOAD. Y-Axis Label: Pts/B.H.P./HR. X-Axis Label: B.M.E.P. lbs/sq" Curve Labels: STANDARD, DIFFUSER 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 carburetter were not so good as the standard but as we are only putting for-ward power output results in this report we will give the other results - which form a complete series of experiments - in another report. contd :- | ||