Idea: Real Cold Air Intake
Elder User
Joined: Jul 2005
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From: North Texas
I've seen a couple of reputable dyno tests on new mustang with K&N filter and cold air kits. The gain was about 13hp. I don't remember if that was at the engine or rear wheels. I'm just saying there is no appreciable supercharging effect from my testing. So any power gain must be from colder air and/or less restrictive filters and duct work.
More Turbo
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Elder User
Joined: Jul 2005
Posts: 969
Likes: 1
From: North Texas
Interesting. It's odd that the dyno test progressively improved like that. Makes me wonder if the car was cold. Since you can see a couple horsepower change from run to run, I'd say there's not a huge improvement.
Elder User
Joined: Jul 2005
Posts: 969
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From: North Texas
So, how about taking this post in a slightly different direction? Lets assume that cold air is good, and air pressure differentials are too small to notice.
What designs do you have for a CAI(cold air induction) system on a truck that has none to begin with?
For a 400 engine @ 5500 the CFM is about 520. This means the minimum diameter at any point in the CAI should be 16 square inches.
A single 4.5" tube, two 3.2" tubes, a 4x4 plenum, or a 2x8 hood scoop would supply cold air with no restriction.
All the systems would need a box built around the air cleaner. But do you run a tube to the cowl? A tube to the wheel well? A tube to the grill? Fabricate a shaker hood scoop? Fabricate a shelby/ram air type hood scoop?
What designs do you have for a CAI(cold air induction) system on a truck that has none to begin with?
For a 400 engine @ 5500 the CFM is about 520. This means the minimum diameter at any point in the CAI should be 16 square inches.
A single 4.5" tube, two 3.2" tubes, a 4x4 plenum, or a 2x8 hood scoop would supply cold air with no restriction.
All the systems would need a box built around the air cleaner. But do you run a tube to the cowl? A tube to the wheel well? A tube to the grill? Fabricate a shaker hood scoop? Fabricate a shelby/ram air type hood scoop?
More Turbo
Joined: Nov 2003
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Elder User
Joined: Jul 2005
Posts: 969
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From: North Texas
LOL! I was just looking at their site. There's a carcraft article and a fordmuscle article that say this kind of setup will give you 2 tenths in a 1/4 mile on a high or low 13 second car. So, how do you get the airbox cheaper?
http://www.fordmuscle.com/archives/1...ox/index.shtml
http://www.fordmuscle.com/archives/1...ox/index.shtml
Last edited by derherr65; Nov 27, 2005 at 09:46 AM. Reason: found the link
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Posting Guru
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When I was racing my 34 Coupe, I ran a cold box for the air induction. It was a homemade ice chest that had the intake lines run thru it and we filled it with dry ice. You could count on it for knocking 3/10 seconds off of your run. But, you also had to richen up the carb a little to take full advantage, not something you are going to do with a computerized engine. For todays engines, I haven't seen any reliable science indicate that there are any improvements to be had with a cold air intake. I think the auto makers have stretched as much out of these engines as reliably possible. Most of the claims are from the cold air box manufacturers but surely they wouldn't lie just to make a dollar. 
Junior User
Joined: Nov 2005
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dont mean to butt in ,what if you combined two theories nitrous and cold air? how about istalling a small compressed air or 02 cylinder and plumbing in after the maf b4 the throttle body. this would give you lower temps and higher o2 for increased combustion. ive never tried but always wondered
Posting Guru
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From: Destin/Ft. Walton Beach,
what if you combined two theories nitrous and cold air?
Don't need to. Nitrous is colder then compressed air to begin with, and it also adds oxygen. (N2O is 2 parts nitrogen and 2 parts oxygen.)
<!--StartFragment --> Nitrous oxide has this effect because it has a higher percentage of oxygen content than does the air in the atmosphere. Nitrous has 36% oxygen by weight and the atmosphere has 23%. Additionally, nitrous oxide is 50% more dense than air at the same pressure. Thus, a cubic foot of nitrous oxide contains 2.3 times as much oxygen as a cubic foot of air. Just do a bit of math in your head and you can see if we substitute some nitrous oxide for some of the air going into an engine than add the appropriate amount of additional fuel, the engine is going to put out more power.
Last edited by stevef100s; Nov 27, 2005 at 06:28 PM.
Elder User
Joined: Jul 2005
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From: North Texas
True. But nitrous isn't a daily driver solution. You have to buy all sorts of electronics, solenoids, bottles, lines, etc to really do it right. Then it only makes a couple passes before you need to refill the bottle.
Then there's the bragging rights. "Gee, my all motor truck beat your sports car." is a lot more impressive than "gee, my truck with a 500hp nitrous shot beat your sports car" Most people reply "well duh!" to the latter. But then I prefer sleeper type vehicles with power on tap at all times, so maybe that's just me.
Then there's the bragging rights. "Gee, my all motor truck beat your sports car." is a lot more impressive than "gee, my truck with a 500hp nitrous shot beat your sports car" Most people reply "well duh!" to the latter. But then I prefer sleeper type vehicles with power on tap at all times, so maybe that's just me.
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