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).
Analysis of engine torque variation and M.E.P. with changing intake air temperature, comparing a system with 'no heat to hot spot' to a standard system.
| Identifier | ExFiles\Box 66\2\ scan0205 | |
| Date | 26th June 1926 guessed | |
| contd :- -3- TORQUE VARIATION WITH INTAKE AIR TEMP. NO HEAT TO 'HOT SPOT'. B.M.E.P. lbs/□" 90 85 80 20 30 40 50 60 70 80 90 100 INTAKE AIR TEMP. °C. NORMAL MINIMUM VALUE THROUGH ERRATIC RUNNING We also see from this curve that the maximum M.E.P. recorded is 90.7 lbs/sq.in; whereas with the standard hot spot and an outside air temperature of 32°C we obtain 95 lbs/sq.in. M.E.P. This in itself is good evidence that the dsitribution is not as good with hot air as with a hot bend. In order to directly compare the efficiency of distribution of the two systems a test was made in which the mixture strength was varied over approximately the total range of stable running and the variation of torque recorded. The air temperature when using the standard hot spot was kept as low as possible - 32°C - and with preheated air was 80°C. The results obtained are shewn in the curve below in which the M.E.P. is plotted against the mixture strength and gives a good indication of the distribution. contd :- | ||