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).
Graph and analysis comparing engine fuel consumption under different heating systems.
| Identifier | ExFiles\Box 66\2\ scan0157 | |
| Date | 2nd February 1926 guessed | |
| contd :- -12- [Graph Text] SPEED 1500 R.P.M. AIRTEMP 33-38 °C BAROMETER 751 M.M Y-Axis: PTS/B.H.P./HOUR. X-Axis: B.M.E.P. lbs/D'' Curve Labels: STD EXH HEATED WATER HEATED SUPERHEATED [Main Text] The standard system still possesses the advantage of giving a lower minimum specific consumption but the 'Superheated' curve follows it very closely. Consideration of these tests prove to us that the max. power obtainable at any speed is substantially the same for each system but a lower minimum consumption can be obtained with the standard system than with either of the other two. The grater range of mixture strengths giving steady running of the engine is another indication that the standard is the most efficient of the three in correcting uneven distribution. Referring back to curve No.4. which gives the temp. of the heating mediums of the standard and water hot spots, we can assume from consideration of the last test that the normal heat input to the carburetter is greater than given contd :- | ||