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Old 07-24-2011, 10:28 AM   #1
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Built me a Cold Air Intake! What do ya think?

Built this a day or two ago out of 3 inch PVC piping. It definitely did help my power a bit. What do ya think?




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Old 07-24-2011, 10:34 AM   #2
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nice job

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Old 07-24-2011, 11:16 AM   #3
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Looks nice, even professional -- not a kludge in the least! Any chance you could list parts and procedures? I'd love to pull a job like that on mine. Hell, I might actually just go out and take a look at the possibility now...
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Old 07-24-2011, 11:29 AM   #4
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X2 on the parts list.....especially the adapter from Carb to PVC......
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Old 07-24-2011, 12:10 PM   #5
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Like it alot part list would be sweet. Id like to build this for my YJ
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Old 07-24-2011, 12:27 PM   #6
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It looks good but what is it suppose to actually do ?
And why did you make it so long and go over the engine instead of just running a short pipe to where the old air box was ?
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Old 07-24-2011, 02:22 PM   #7
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My thoughts also stimpy, your still using hot air from under the hood, at least the original air box did draw air from in front of the radiator. That air would be cooler then air under the hood, but each to their own looks good anyway I won't take that away from you.
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Old 07-24-2011, 02:31 PM   #8
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Funny. Way back when I had my Yj I
Did the same. Seem to help a little after my converter went and I had a better flowing one installed
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Old 07-24-2011, 11:08 PM   #9
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The reason I moved it to the other side is because the exhaust manifold is on the side that the air box was on and the manifold created a lot of heat. The fan still blows air on it where it sits.

What I bought from home depot:
3 inch PVC piping (id say 3-4 feet to be safe)
90 degree elbow of 3 inch PVC piping
Three 45 degree elbows (one that has 2 female ends. the other ones have one female end and one male end)
3 inch to 2 inch rubber cuppling (to attach the pipe to the throttle body)
One pipe clamp (bolted it to the top of the alternator. Need to buy another clamp so buy 2!)
3 barbed hose fittings (one is 3/8" and barbed on both ends. this will be used to extend the line on the right in the picture. Another is 3/8" on one end and the other end is threaded. The last one is half inch on one end and threaded on the other)

From Autozone:
High flow air filter (don't buy too long of a filter)
3/8" gas line (to extend the hose on the right)
High temp Rustoleum black paint (spray can)
Hose clamps


There's no walk through really. Just put the cuppling on the throttle body with some grease, then tighten down the hose clamp that's on there. I have to cut about a half inch off the bottom of the cuppling so the PVC wouldnt hit the hood. Then install the 90 degree elbow (i also took a little off the bottom of the elbow). Then hold up your straight piece of PVC to see where you need to cut it. Make your cut and put it on the 90 degree. Attach the 45 degree elbows and adjust them so they end up going towards where the filter will be. Cut another piece of straight pipe to extend off the 45 degree elbows so the filter is a bit past the alternator. Once you are pleased with its fit, mark how each pipe should go by drawing a line across each seam where the pieces of piping come together. Take the intake off as a whole and take one part off at a time. Use PVC primer/cement to glue the pieces together. This cement sets up quick so make sure you get those lines lined up as youre pushing the pieces together! Once it's together, drill the holes where the barbed fittings will go. Copy mine, it seemed to work out well. Thread the holes with a tap and install the barbs. Tape up the barbs, plug up the ends of the intake with rags, and spray paint the tube. Let the paint heal and installed the intake. Lengthen the hose (on the right) using the 3/8" double sided barbed fitting and the gas line. Attach the hoses to the fittings on the intake. (You see the rubber fittings that attached the hoses to your stock air box? Use those to connect the hoses to the intake and lengthen them. You can use hose clamps if you need to.) Install the pipe clamp where I have it and bolt it to the alternator. Put on the filter and you're ready to go. It took me one day to get the supplies, and one day to finish the project.

And yes RedRider you're probably correct. The stock intake box probably did pull in cooler air. When you pull out that stub that pulls the air in, you'll see how little air it pulls in. We're increasing that small diameter to a much larger 3 inch diameter which allows much more air and oxygen in to the engine to help it run more efficiently.

It's like sucking a milkshake and water through a straw. It can be pretty hard to suck a milkshake through a straw correct? Thats the stock intake. It's much easier to suck in water through a straw, and thats why we increase the pipe diameter, so the engine can breathe better.

I can try my best to clarify some parts if anyone's confused. Just let me know!
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Old 07-24-2011, 11:13 PM   #10
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But thanks for the compliments everyone!
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Old 07-25-2011, 10:35 AM   #11
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Total Pricetag?
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Old 07-25-2011, 10:46 AM   #12
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Don't get that filter wet!!
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Old 07-25-2011, 11:43 AM   #13
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I like it looks good nice job
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Old 07-25-2011, 11:55 AM   #14
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Are you a Plumber? Nice fitting!
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Old 07-25-2011, 12:00 PM   #15
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i like the look, but y not build a snorkle?
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Old 07-25-2011, 04:12 PM   #16
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It all came out to about 60-70 bucks. I dont have the exact price. And nope, not a plumber, just a junior (or up coming senior) in high school. And I don't plan on getting the filter wet haha. I'm taking a break from wheeling. I'm just trying to keep it clean as I can for a bit. I didn't snorkel it because I didn't want to cut a hole in the body and I don't go in any deep water to where I'd need a snorkel.

I am planning on making a shield to go around it some how, or just under it to protect it from splashes.
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Old 07-25-2011, 04:25 PM   #17
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Quote:
Originally Posted by bc3_Jeep View Post
.....especially the adapter from Carb to PVC......
Carb?

I did something similar on a 99 s-10 4.3 once, but it wont pass in an emissions state, be ready top swap in the stock air cleaner for any emissions treating in your area.

It does look good, i would add a piece of sheet metal, bent to block under-hood air so the colder air is pulled form the headlight area.
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Old 07-25-2011, 04:29 PM   #18
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Its EFI, no carb.

I am going to bend up some sheet metal to help protect it a bit from splash and to block the heat a bit
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Old 07-25-2011, 05:04 PM   #19
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Quote:
Originally Posted by YJman
It all came out to about 60-70 bucks. I dont have the exact price. And nope, not a plumber, just a junior (or up coming senior) in high school. And I don't plan on getting the filter wet haha. I'm taking a break from wheeling. I'm just trying to keep it clean as I can for a bit. I didn't snorkel it because I didn't want to cut a hole in the body and I don't go in any deep water to where I'd need a snorkel.

I am planning on making a shield to go around it some how, or just under it to protect it from splashes.
Ah ok, well that's a good reason to not do snorkel
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Old 07-29-2011, 11:38 PM   #20
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Building it tomorrow.

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Old 01-27-2014, 03:53 PM   #21
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just bought my pvc pipe from the hardware store and hopefully going to be installing this intake very soon...nice write up man and thank you for the idea and look
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Old 01-27-2014, 05:09 PM   #22
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just one question...how did you get the hoses into the pvc pipe and then keep them from letting air out?
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Old 01-28-2014, 02:41 AM   #23
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Great looking cold air intake!
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Old 06-30-2014, 07:14 AM   #24
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I'm planning to build a snorkel for my '93. I was going through some old threads for tips and saw a post about not passing emissions tests. I live in PA so we have those emission tests here. What does the snorkel do that'll cause my jeep to fail the test? My plan was to replace the stock air filter box with the snorkel and just add any sensors or hoses to the PVC pipe.
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Old 06-30-2014, 07:56 AM   #25
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What do you think the air temperature difference is where he located it verse the stock going down the road with all the air passing from the front of the vehicle to the rear, I'm sure at idle or low speeds the transfer of air is less but would it really matter that much? Especially since he has a mechanical fan pushing air? How much HP do you think he lost by building the intake that is much less restrictive than the stock one? Also now he has more surface area for air compared to the minimum size of the original intake box with the small snorkle. Without a Dyno I really couldn't pass judgement on his application.

I bet someone would have something negative to say about my arb snorkle, with a ceramic coated TJ intake on my yj, ceramic coated header and the 5 hood vents I installed too, maybe mine doesn't get enough heat ha ha

I think he did a great job an I applaud his efforts and from all the articles I have read a intake such as his have been proven to increase horsepower...
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Old 06-30-2014, 09:44 AM   #26
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Looks good, but may I suggest anyone going with this type of filter also use a pre-filter. K&N type filters are notorious for letting in lots of dust and sand along with lots of air. The pre-filter by K&N fixes this weakness and adds some splash protection since the screen is so tight it's somewhat water resistant.

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