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 - Restoring a John Deere 2010 Diesel Tractor - by Jim Nielsen. Following seven years working in California's Silicon Valley, my wife, baby son and I moved back to Australia to retire. We bought a small 'farm' of about 50 acres near Bendigo, in the state of Victoria. I soon found that it would be very useful to have a tractor around the place for things such as grading our long drive and brush-hogging the fields. I was also embarking on planting 1000 eucalyptus trees, and hence I would need a ripper, small disk plow, sprayer etc. to get these things accompli
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