IMHO, cooler air is denser, thus contains more oxygen by volume. Humidity decreases O2 content by volume. cool air more potential , wet air less. But when you combine the two, cool and damp air it likely is a net increase.
And, it is confusing as cool night air always feels damp to human skin. But, that may not be really true. Think of it this way, there is usually no weather change effecting humidity coincident with sundown. Just feels that way.
water injection works because it is introduced after the air and fuel is mixed. It work in different ways in different engines. It allows more timing advance on supercharged or turbocharged engines. It was used on early jets to lower power turbine temps and increase thrust through the increased mass of exhaust gases. Anybody remember early b47/b52 or even b707s on takeoff and that huge plume of black?
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Today's Featured Article - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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