Quote:
Originally Posted by Oleg Maddox
It is depending of gazoline, pressure, RPM, and so many other factors... Even at different altitudes it is different really...
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Actually, Winny is right, it doesn't depend on those factors.
Color is related to the temperature of gases produced during combustion: the hotter, the whiter; the colder, the redder. Blue indicates a very high temperature. Near-perfect combustion of hydrocarbons is always blue.
Yellow indicates an imperfect combustion, i.e. lack of combustive agent (usually air) which causes production of soot, i.e. smoke. However, even a very rich mixture as used on a cold engine would not produce yellow flames, but add a yellowish hue at the end of blue flames.
Red indicates a very bad combustion. A damaged engine burning oil would probably produce reddish flames.
Hope this helps
