[maherbaz]

I have been thinking a lot lately about fogging my air box. Everyone on here seems to like it a lot. I am no engineer, so the logic seems sound to me:

Find a source of cold air, and force it in. This makes the engine burn more fuel, and thus more power.

But the more I think about it, the less sense it makes...
First, about the "forcing." On Fogg's website, he compares the air flow at several RPM levels. This shows a dramatic increase in air flow even at low RPMs. I can't imagine the car traveling fast enough at this RPM to force much air all the way from the brake line, up the tubing, into the air box, etc. Also, I read in a post on here that some people leave the stock intake in place, and cut another hole in the air box for the hose to the brake duct. Let's assume that at high speeds air is really able to be forced up the hose. If air was being forced up the "fogged" tube and merely "sucked" in through the stock tube, no air should be traveling in through the stock intake. The forced air coming from the "fogged" tube would then procede to follow the path of least resistance. This path wouldn't be up through the air filter, it would be out the stock hose. The only air entering the engine would therefore be the air it sucked up.

Second, about the air being colder. So I started thinking, if the air isn't being forced in, perhaps "fogging" simply allows the engine to suck colder air than the air coming from in front of the grill. Colder air is more dense, so an equal ammount of colder air would be equivelent to much more warm air. Everyone seems to agree that the air down low would be colder than the air at grill level. Why? I drive on roads that are typically black or grey. The pavement gets hot in the sun, and the closer you are to it the hotter the air is. Thus I have no reason to believe the air closer to the pavement would be any cooler.

My final thought was that perhaps just having a second source of air to the airbox would allow the reported increased air flow. I checked out the article in the notebook section about adding a dual air intake. The author did seem to think that this gave him more power because of the added noise, but when he tested it he found out that it didn't change. So that is ruled out.

Has anyone besides the inventor tried measuring the air flow after fogging? Has anyone checked their HP?

Once again, I am no engineer. If my reasoning is faulted in any way, please let me know. This is driving me nuts.