Originally posted by gmeast
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Byproducts of combustion are: unburned hydrocarbons, mostly water and small amounts of carbon monoxide/dioxide and nitrous oxide. Mainly Nitrogen and steam are pushing the piston. For every 14.7 lbs of Air and 1lb of gasoline car exhaust has about 11lbs of Nitrogen (.78x14.7) and about 1lb of water.
What is the relative humidity in the car’s exhaust?
“The humidity in the air plays a much bigger role than combustion by-products.” Humidity dilutes Air/Fuel ratio and decreases horsepower, lowers combustion temp by this reduces NOx formation and acts as cheep octane booster on engines with compression ratio around 10 (only at part throttle).
Al
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