kobi2002

iTrader: (1)

I can't answer if it cools or not but if the oxygen content is less with humid air, how would it benefit when you have less oxygen?? I live in Ft lauderdale and my car sucks when it is humid. I just don't understand that logic

BOOSTEZ

iTrader: (1)

This is incorrect. Air with a lot of water vapor (humidity) is less dense than air with little water vapor. This is because water is lighter than nitrogen and oxygen. The denser the charge, the more power. Look it up in wikipedia.

This is correct!

STi2EvoX

It depends on the level of humidity and the ambient temperature. For example it is scientifically proven that 100% humid air contains about 3-4% less oxygen than dry air at 100 degrees Fahrenheit, but only about 0.4% less at 32 degrees Fahrenheit. However, humid air cools the incoming air charge a lot like water injection does, offsetting the fact that humid air may have slightly less oxygen content. Since colder air has more oxygen content than hot air, the humidity cooling the air charge can bring back some oxygen density back into the air. The benefits of humid air are much more prevelant on a turbo charged car, as compression of air produces heat as a byproduct. Either way, it's still far better horsepower making air than dry air at 5000 ft above sea level. BTW, the reason that when it's humid your car feels like it makes less power is probably more to do with the fact that frequently when it's humid in florida, it's also hot. The ambient temperature probably has more to do with your power loss than the humidity.

kobi2002

iTrader: (1)

Not always, but what ever I guess

STi2EvoX

I added info to my earlier post to better prove my point.

BOOSTEZ

iTrader: (1)

And that is almost always the case which is the reason why it's a moot point.

PDXEvo

iTrader: (4)

Only on the internet could we spend almost a full page of posts, that are supposed to be dedicated to drag racing, to humidity and O2 content. You guys are funny.

STi2EvoX

lol, that's true. let's get back on topic.

bchappy

basically I feel an 8 and 10 are really going to run identical #'s stock
they are both trapping around 98 here stock.

Robevo RS

iTrader: (16)

"The benefits of humid air are much more prevelant on a turbo charged car, as compression of air produces heat as a byproduct. Either way, it's still far better horsepower making air than dry air at 5000 ft above sea level."
first part, it is a same for less dense air too... so that is why i brough it up the 3000 asl wich is not too drastic for the turbo charged cars, for the same reason . The fact is the less dense air has better compression then humid since the water molecules are bigger then oxigen. so the dry air is easyer to compress.
dont change the subject we talk about 3000 asl not 5000.
well ...
"Since colder air has more oxygen content than hot air, the humidity cooling the air charge can bring back some oxygen density back into the air. The benefits of humid air are much more prevelant on a turbo charged car, as compression of air produces heat as a byproduct. "

i dont know how you get to this point... if you have X amount of air with the % of oxigen thats not will change the air oxigen % when you suck it thru the turbo... so the x amount of air hold x% oxigen ang going thru the turbo will compressed . But the more dense air will compressed too so the air quality difference will remain a same.

the fact is :
humid air hold less oxigen period.
Hot air hold less oxigen period.
The mix hold much less oxigen period. extra negative effect for the humid air is a carburator icing wich is we dont care since we are injected./ just an extra info for fun or for education/ So the mixture of both can produce very poor air quality. Some times very close as 3000 asl. Not 5000 that is too much difference from the begin with.

So what i said before; the 3000 above sea level elevation have effect on performance, if you got the SAME condition in sea level. Matter a fact every 1000 feet will measurable change, IF we always got the same tempeture and humidity. Then you can blame the leaner air. But this is not always true. i dont wanna go too deep into this ,i always hated weather./ like inverted airtempeture etc./

the fact is around 3000 asl you can have very close conditions like at sea level in bad weather . Like in vegas at night probably if you run 29.92 inhg and around 70-72 farenheit. is much better air quality then Florida 100% humidity and 90 and above air tempeture.
if anybody want to go deeper then you can go any aviation school to learn it and they will explaint for you.
Or you can get some real basic info from the net but no really explanation.
http://en.wikipedia.org/wiki/Atmospheric_pressure
http://avc.comm.nsdlib.org/cgi-bin/w...e_And_Humidity

Over 5000 asl is no chance to get the same close call then 3000 asl. Over 4000- 5000 asl is defenietly your car is suffering from oxigen.
But at sea level can simular condition occur, like around 3000 asl . And that is my point here.

Mmelmann

iTrader: (1)

I have to calculate the power that my engines will be able to produce and figure out how much power is required for my helicopter in specific regimes each day based off of the temp, dew point, density altitude, and pressure altitude. I run two turbine engines in my helicopter. If there is more humidity in the air... we will have less power available along with other things being less efficient. Humidity is bad... and oxygen is spelled with a y by the way.

Here are some definitions and equations for all my friends.http://en.wikipedia.org/wiki/Density_altitude

Robevo RS

iTrader: (16)

it is related to the a/f ratio ... and that is a major thing for racing don't you agree?

Robevo RS

iTrader: (16)

hey i have a gyroplane! The RAF 2000. But i had 80 hours in R22 and R44 Raven ,Schweitzer 300 / combined/

Rootus

Because one unknown guy with an unknown amount of skill driving an unknown Evo X got a time at the dragstrip that we don't even know the full details of. There's not a lot to talk about .

Mmelmann

iTrader: (1)

I just looked at the RAF 2000... looks pretty damn cool. That little sucker looks fun. I wish we could autorotate like that thing can. Keep the rotor side up. (You're a crazy man)