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Old 11-13-2009, 11:34 AM   #1
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Homemade Cold Air Intake

I'm going to do this, one way or another. I know it's been done before, and looking at the AEM ones, and other such mainstream brands, the technology really isn't all that advanced. My current idea is to take the measurements, go out to home depot, and get some PVC pipe to manufacture the tube from, Get a high-flow cone filter from an auto store, and fabricate the warm air shields that allow it to be a Cold air intake from some basic sheet metal, also from home depot. 94, 2.5L, 5 speed. I'm sure my idea can be revised and perfected though, so I came here, to the most knowledgeable, and crafty, people I know. Anyone got any ideas on how to make it better? I do intend for it to look fairly good, and I have taken into account the hoses that go into the stock air system. Probably just going to drill holes in the PVC at an elbow and attach them with something or another.

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Old 11-13-2009, 11:50 AM   #2
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Also, I just thought of something. The intake pipe will be subjected to a temperature increase before the throttle body that could mean the air raises in temperature. Should I go about insulating it in any way, such as reflective tape, or a foil material, or anything like that? I would rather not, because that would defeat it looking nice, but if the gain would be significant (I doubt it) it's an idea to think about.

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Old 11-13-2009, 11:36 PM   #3
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Keep us posted on your mod. I'd love to see some pictures.
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Old 11-14-2009, 12:13 AM   #4
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for the price of all that shit from home depot you could buy a cheap CAI off of ebay or autozone
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Old 11-14-2009, 08:39 AM   #5
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And it would do about as much good.

Build a snorkel.
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Old 11-14-2009, 09:31 AM   #6
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I had a store bought CAI on my 89 2.5. It did give a little increase but nothing that was worth all the cost and trouble.
Instead of having the inlet to the air intake under the hood, move the intake to the high pressure zones of the jeep. Like just above the windshield or right above the front of the hood. The one in front of hood is not a good choice for obvious reasons. But the one above the windshield is, ARB builds their snorkel kit to have the intake right there.

If you take my advice, look up the arb snorkel and copy the part that is on the outside of the jeep. The intake manifold to the air cleaner can be a straight piece of PVC. Then make a BIG hole in the intake box and attach the snorkel from outside.
This would give you fresh cold air and a slightly pressurized rate.
This is a perfect copy of the system. Its was home built using exhaust pipe.




reference credit.
Homemade Jeep Snorkel w/pics
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Old 11-14-2009, 11:06 AM   #7
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While I do like the idea of more power than that, I only need a little..I'm not looking for alot. Also, write ups I've seen put a homemade CAI at around $36, plus a hole in your fender. I'm not doing that, I'm just doing the sheetmetal box. Also, I don't like the idea of putting a hole in my jeep-even for a snorkel. Especially since I have no use whatsoever for a snorkel. I do a little bit of offroading, but for the most part, it's just on road. The main reason for this is just to have a project. If it doesn't work, well, so what, it was worth the experience.

Also, chances are I have nearly everything I need already anyway. My father works for Wagner Corp., and has alot of spare everything from that, and there is a large supply of odds and ends in the barn at my mothers old farm...180 years of odds and ends.
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Old 11-14-2009, 11:47 AM   #8
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wonder what your Dad would say about the benefits of a CAI ?
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Old 11-14-2009, 11:52 AM   #9
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Quote:
Originally Posted by jvc View Post
wonder what your Dad would say about the benefits of a CAI ?
Good one.

Sounds like a 16 year old kid, "Im gonna do it anyway". But what do I know, I had it and told ya it was a waste of time, BUT you might change all that.




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Old 11-14-2009, 12:12 PM   #10
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well.... it is from real experience

I do agree that colder air is therefore denser and may improve engine efficiency depending on the conditions and other variables present.

My son drives a 1999 TJ SE 2.5L and the "old man" drives a 1999 TJ Sahara 4.0L.

both are stock air intakes with good air filters.
took some convincing but the 'Dad' was right,,,the home made snorkel looks great and well thought out, very promising and very inexpensive. Thanks for the info !
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Old 11-14-2009, 12:41 PM   #11
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I like that one I posted also. Most snorkels you have to cut the fender. this one it is just a little section of the hood. Now I got to find someone that can mandrel bend me some 3" tube.
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Old 11-14-2009, 09:19 PM   #12
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can u post a pic of what the inside on the engine bay looks like with the homemade snokel?
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Old 11-14-2009, 11:09 PM   #13
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The reference credit is in the pic post. Just have to follow the link
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Old 11-14-2009, 11:18 PM   #14
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I'm beginning to understand what Navychief was talking about the other day. I'm not interested in being berated by any of you. The fact is, I don't give a damn about whether or not it really helps all that much. It's for the fun of it. I've stated many times in the past that I'm a seventeen year old. However, I'm also more than fairly intelligent, capable, and have a decent amount of trial and error experience as far as this jeep goes. Considering I've replaced the radiator, exhaust, cut the body to install new fender flares, did a LOT of body work, and several other modifications all on my lonesome..I don't think your input really matters. If you want to berate someone, do it elsewhere. The point of this forum is to be helpful and considerate, not to be arrogant. People who do so aren't worth their weight in sh*t, so please, if you don't have anything encouraging or helpful to say, leave off. I've no interest in the much greater benefits of a snorkel. That's pointless to me. I'm not cutting holes in my jeep, or doing something to it that I think looks stupid. Call me superficial, I don't really care. I wouldn't consider the minor benefits of a CAI to be of any use whatsoever, if I were buying it. The experience and project aspect of it are worth it. Find another teenager, preferably one who actually DOESN'T know what they are doing, to discourage. I'm not expecting massive benefits. I just want to see what it does. That is all. To those of you who helped, I extend my greatest appreciation. To the rest... I was looking for the help of those who are clever, not those who read what I say and take me to be ignorant. Atleast I've got the balls to be do things independantly, unlike most other teens.

As for the pictures of this project, I will try my best. No guarantees, I'll have to borrow a friends camera to do so. Don't really own many superfluous things like that myself.
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Old 11-14-2009, 11:27 PM   #15
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Old 11-14-2009, 11:30 PM   #16
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Fair enough. I must admit I spoke while abit hot headed, but the advice is duly noted, and appreciated.
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Old 11-15-2009, 08:55 AM   #17
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I spent 6 years on Pirate. That little tirade was nothing more than a kiss on the cheek.
Quote:
Anyone got any ideas on how to make it better?
But I did answer your question. You just too stubborn to listen.
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Old 11-15-2009, 12:17 PM   #18
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You did, and I appreciate it. However, I also accepted the advice, and then explained why I wasn't willing to follow the advice, however good the advice may have been.
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Old 11-15-2009, 12:43 PM   #19
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Good man then. Do take pics and show us your work.....
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Old 11-15-2009, 02:17 PM   #20
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check this out.
Comparison of 10 CAI
gives PROS and CONS of them

http://www.jpmagazine.com/techarticl...out/index.html


Cold air can be achieved by using heat shield barriers, ram air, turbochargers or snorkels.

(subtract) turbo --- since that is not in question and higher budget range.

(subtract) ram air effect--- especially since snorkel also does not exhibit that benefit
unless you are considering redirecting air flow ???

snorkel exhibits a measurable temperature difference when compared to stock intake or approximately 12 degree Fahrenheit cooler. Quantifiable and can be confirmed.

primary benefit of snorkel is for water (hydro-lock) prevention.
but I am not thinking about being a U-boat commander in the TJ ...LOL

There might be some benefit with a 'under the JEEP hood CAI' although not sure what "home made" materials or Dad's garage leftovers one would use.

I would be very curious to know of your plans....please...
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Old 11-15-2009, 03:18 PM   #21
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I will try my best to take pictures; there's two of us doing it, actually. The other has a 95 XJ 4.0L, so we will take and post pictures of both I suppose. We will probably use some of the ideas from here Homemade Horsepower by: Fredrick M. trippler Jr., since it seemed to do that guy some good. I'll post about any new developments past what I've already described when the time comes.
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Old 11-24-2009, 04:19 PM   #22
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thought of making my own also, read all posts, i give you credit for trying
this, besides its something to do, let us know how it turns out!!!!
heck, GRUMMAN AIRCRAFT started in a backyard garage!!!!!!!!!!!
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Old 11-25-2009, 11:35 AM   #23
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Haha, indeed. There's an old abandoned Grumman factory right over the hill from me, actually. But they made the trucks, not planes. And then a fiberoptics company bought it...and went out of business. Anyway...I'll post pictures of both mine and the 95 XJ, when we get around to it. I also need to clean out my valve cover, and replace the gasket while I'm at it.
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Old 01-17-2010, 08:45 PM   #24
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Cool, I finally found this .been reading a while now .Ill take a trip to summit this weekend.
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Old 01-17-2010, 10:39 PM   #25
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Indeed. I need to get around to this little project soon, actually >_o. But there's also a 72 Suburban in better shape than my jeep with a 400 in it that I'm starting to repair this spring... So who knows when I'll get around to this. Preferably sooner rather than later.
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Old 03-11-2010, 10:18 AM   #26
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Talking "Homemade Horsepower" 2004 article

Hi Everyone, just wanted to drop a note to say I'm quite pleased that people are still kicking around my ideas. If you have any questions, I'd be glad to answer. The original article I wrote is here.

Homemade Horsepower by: Fredrick M. trippler Jr.
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Old 03-11-2010, 09:22 PM   #27
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Haha no problem, and welcome. It was a very helpful article, though I've yet to get around to this project

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