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Old 10-16-2016, 02:14 PM
  #8  
Chris W
 
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"The byproducts in the exhaust of a running alcohol (glow) are water vapor and CO2. The exhaust residue on your glow powered plane is loaded with unburned fuel thus it is clear. The exhaust of gasoline or diesel are unburned Hydrocarbons and carbon and if a 2 cycle, engine oil. That's why the exhaust you see coming out of a glow engine is white clouds just like what you see in the sky (water vapor) whereas the gasoline or diesel is gray smoke. The oily residue in gasoline engines is a function of low oil content in the fuel. The black oily exhaust residue from the diesel is normal and is nothing more than carbon mixed with oil but not cut by unburned kerosene. The lighter the color say brown or golden brown in a very rich diesel thus diluting up the exhaust with unburned fuel."

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