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Unread 07-25-2012, 11:41 AM   #1
nick126
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2001 XJ Cherokee 
 
Join Date: Jul 2012
Location: lancaster, new york
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cheap air box mod ?

i am looking in to a intake for my 01 jeep cherokee sport but i dont wont to fork out 250 bucks for one and i plan on doing some muding with it. is there any thing i can do?

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Unread 07-25-2012, 01:26 PM   #2
MeanGreenBean
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I went and cut the front part of the intake (part that sticks into core support) off, plilugged the hole using great stuff and two portions of the cut off piece. Then i went and got a box elbow from true value cut a square in the back and put it back there with some silicone sealent around the edges. Ended up not aucking in water when i dipped into a water hole over my hood and that came up to my cherokee symbol when driving through. Definetly got my pants wet though
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Unread 07-25-2012, 06:09 PM   #3
MossGreen97
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A lot of people replace their air boxes with cone filters to get more air flow. The problem is not the filter as much as the corrugated section between the air box and TB elbow. The corrugations disrupt air flow no matter what filter you use. To solve this issue on mine I dropped in a K&N panel filter combined with a piece of exhaust tubing 2 1/4 in. IIRC just long enough to go from inlet and outlet transition inside the tube. I sprayed some silicone spray on the tube and slid it inside the flex section. If you look at the inside of the hose you will see where the corrugation stops and becomes smooth on each end. This is where you want the pipe to stop. I measured this mod before and after with a digital air flow meter at work. I tested it at idle and there was a 6 cfm airflow increase. Air flow will increase at higher velocities as well because the turbulence would be greater at higher velocity without this mod. Total cost : about $47 for the filter and $5 for the pipe. And there is still enough flexibility to change the filter when needed.
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Unread 07-25-2012, 10:23 PM   #4
nick126
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mossgreen97 u wouldnt happin to have a picture of what u did? just so i can c what u did
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Unread 07-26-2012, 04:26 AM   #5
MossGreen97
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Nick,I'll take a picture and measurement this afternoon when I get home from work.
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Unread 07-26-2012, 08:32 AM   #6
nick126
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thanks
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Unread 07-26-2012, 10:32 AM   #7
Kevin108
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Cowl snorkel FTW! http://www.jeepforum.com/forum/f177/...ml#post8805654

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Unread 07-26-2012, 06:07 PM   #8
MossGreen97
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Here are the pics of my air tube mod. 2 1/2 in. OD exhaust tube 3 5/8 in. long inserted inside tube.
jeep-4.0-intake-001.jpg   jeep-4.0-intake-002.jpg   jeep-4.0-intake-003.jpg  
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Unread 07-26-2012, 09:59 PM   #9
nick126
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thanks for the pictures
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Unread 08-09-2012, 11:14 PM   #10
nick126
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i was wondering if i put the cowl snorkel in do u get at it from under the dash and if it gose in the cab will i take my heat away in the winter ?
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Unread 08-10-2012, 02:15 AM   #11
Kevin108
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No, you don't lose heat. The cowl is a big, open area and there's plenty of flow to feed both the engine and the HVAC blower. The snorkel doesn't come through the firewall. It ends under the windshield wipers.
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Unread 08-10-2012, 07:49 AM   #12
Azzy
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Another alternative is to use a 90 degree and 45 degree PVC fitting to just raise the intake up and back. That way you dont have all that sucking noise in the cab, but raise your ability to enter the water.
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Unread 08-10-2012, 08:16 AM   #13
nick126
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ok thanks for i the info i give it a try and what did u use to cut the cowl ?
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Unread 08-10-2012, 11:02 AM   #14
Planetcat
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I used to have the rusty's tube on my 96. It was a clean, 15 minute install and worked great. Freed up a lot of room in the engine compartment.
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