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Python97
Dodge Dakota
10/10/2001
12:49:34
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 Subject: can air be to cold
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If I make an intake that takes the air from the fornt of the car, can the air be to cold in the winter. Is it better to keep the intake inside the engine compartment??
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Jon
Dodge Dakota
10/10/2001
15:48:00
| RE: can air be to cold
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Im not sure completely but the thoery is the colder air the denser the charge. Maening more air particles in a given area. So I think the best performance would be at sea level on a negative 30 degree day with no humidity. Anythoughts from anyone else. Just curious.
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TigerDak
Dodge Dakota
10/10/2001
15:49:38
| RE: can air be to cold
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I dont believe that air can be "too cold". When the engine gets warmed up, it loves the fresh cold air coming in. You can feel the difference between, say, an 80 degree day and a -10 degree morning!
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Donald
Dodge Dakota
10/10/2001
21:40:42
|  RE: can air be to cold
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scientifically speaking... Cooler air is can't hold as much water vapor or humidity... meaning cooler air is a better choice for combustion.
Jon, I think you are right. The more "air" the more O2 (OXYGEN GAS). For combustion to take place, oxygen has to be present. it is impossible for a fire to burn without Oxygen gas. Which is why water puts out fire... the fire can't get oxygen through the water. Anyway back to my original point.. the more air, the more oxygen, the more combustion. the cooler the air is, the more dense it is, meaning that the more air molecules are present. Cooler air is heavier than hot air of the same volume. That is why cold air falls to the floor, while hot air rises. Hot air is lighter and less dense. Cold air is heavy because there is more air. More air = better burn.
Darn.. themore college a person has, the more stupid they sound.. lol does that even make sense?
:)
Donald
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Jon
Dodge Dakota
10/11/2001
00:06:21
| RE: can air be to cold
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Same theory about flying, planes take off in a shorter distance in the winter. Due to denser air, the wings have more lift, or simply more air to hold on to.
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Dr.Q
Dodge Dakota
10/11/2001
00:51:16
| RE: can air be to cold
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Every plane needs some air to hold on to! Every plane needs some air to hold on to!-Johnathan Livingston Seagull Melloncamp
OK time to sleep,
Q
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Trip
Dodge Dakota
10/11/2001
02:12:52
| RE: can air be to cold
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Just a quick note on this. While I generally agree that the air cannot be too cold, at some point the air would become too cold to allow the motor to work in the optimal range for combustion. By this I mean that the engine temperature would never heat up enough to allow for proper fuel atomization in the combustion chamber. I would guess that it would have to be pretty cold, like say -20 etc. but you might be surprised as to the most efficient outside air temp for the motor, they are, after all, engineered to perform best at "real" temperatures. Also, at some point the black box would not compensate for the air density at very low temperatures and you would hit a "floor" I do believe. Just my 2 cents...
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Dan Gruber
Gen III
10/11/2001
03:53:42
| RE: can air be to cold
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I agree with Trip. But I base that only on the fact that the major car magazines all "correct" their performance data to a specific temp, barometric pressure, and humidity. I can't remember exactly what the figures are, but it is something like 60 degrees farenheit, 29.95 in., and around 50-60% humidity. I know the mags do this to provide comparable numbers between different testing locations, but there's got to be a reason that they all correct their numbers to the same standards, and that might just be the optimum conditions for HP. Then again, I could be on crack.
Dan
2000 CC SLT 4.7 4X4 Auto 3.55 LSD
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4X4Tony
Dodge Dakota
10/11/2001
09:08:18
| RE: can air be to cold
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In the dark days before Fuel Injection, you did have to be careful of the temp of the incoming air. Gasoline will freeze if it gets cold enough. In sub freezing weather, after it sat in that air chilled float bowl and then got sucked into that sub artic blast in the venturi, it would either ice up the carb – and block it shut, stalling the engine – or would turn into little ice crystals that didn’t “explode” in the cylinder, but would do a slow burn – reducing power, fouling plugs, dumping lots of raw gas into the exhaust (and cat, which would then get way too hot) and generally making a mess. With SFI, the fuel enters the mix right before the intake ports, so it’s entering the air stream at “room temperature”, and the air has run through the intake manifold and been warmed a bit by the coolant, so it is very, very unlikely that the gas would ever freeze. Have you ever seen the articles in Popular Mechanics where they take some poor truck and go running around northern Alaska or Antarctica (or something like that)? They can’t shut it off ‘cause the oil and coolant would turn into glaciers, but the engine runs fine. Bottom line - the incoming air cannot be too cold.
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Bluethunder
Dodge Dakota
10/11/2001
09:09:25
| RE: can air be to cold
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Well, I dont think youll win any cosmetic points, but it looks like it will serve the purpose
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Bluethunder
Dodge Dakota
10/11/2001
09:13:59
| RE: can air be to cold
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Disregard that last reply..It was meant for another post...sorry
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