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 the influence of mixture strength on Mean Effective Pressure for different engine heating methods.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan254 | |
| Date | 26th June 1926 guessed | |
| contd :- -4- INFLUENCE OF MIXTURE STRENGTH ON M.E.P. Graph Details: Y-Axis: B.M.E.P. lbs/□" Values: 60, 70, 80, 90, 100 X-Axis: CONSUMPTION Pts/HOUR. Values: 20, 25, 30, 35, 40, 45, 50, 52. ack Curves: Dashed Line: STD. HOT SPOT HEATING WITH AVGE AIR TEMP. 32°C. Solid Line: HEAT SUPPLIED BY HOT AIR ONLY TEMP 80°C The extreme points of each curve are approximately the limits of stable running. The superiority of the hot spot system is at once evident from these curves and not only is the power higher but it is better maintained over a wider range of mixture strength. The actual result seems quite reasonable because it can be imagined that with heat supplied through the walls of the induction system - as with our standard hot spot - the fuel clinging to the walls, and it is that which usually causes error in distribution, will obtain the advantage of this heat and also tend to insulate the more effectively sprayed mixture nearer the centre of the pipe which is well able to take up its latent heat from the air. THE EFFECT OF HIGH AIR INTAKE TEMP: ON POWER AND EFFICIENCY. It has been questioned whether the high temperature of the standard hot spot - which is found to be desirable under normal conditions - is good when the air intake contd :- | ||