Missing Factory Air Box - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-26-2013, 01:54 PM   #1
Jeeper
 
Robertsk1's Avatar
 
Join Date: Jan 2013
Location: Stafford CT
Posts: 265
Missing Factory Air Box

Hey guys.. My buddy just bought a jeep and when he drove it over we popped the hood and I noticed it was missing the factory air box. The Jeep just has an aftermarket (I believe it was a spectre) air filter on the end of it that is clamped to the hose above the engine block.

Are there any possible consequences of this? I know cold air intakes don't really help and can in fact hurt the 4.0 but I'm curious if this would cause any problems with the engine besides being more prone to water in the engine compartment.

Thanks in advance

Robertsk1 is offline   Quote Quick Reply
Old 06-26-2013, 02:09 PM   #2
Jeeper
 
tallzdatank's Avatar
 
Join Date: Sep 2012
Posts: 1,045
nothing other than the water you mentioned, as long as care is taken to maintain it. you should be ok I would think.

tallzdatank is offline   Quote Quick Reply
Old 06-26-2013, 05:04 PM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,131
Images: 2
If it has a K&N air filter installed, it will let in more fine dust & dirt. After my previous TJ was stolen, I bought a Jeep that was also missing the OE air box & had an aftermarket air intake. Getting the OE air box & a good paper element air filter into that Jeep was my #1 priority after getting it home & I was able to find one without much trouble.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 06-26-2013, 08:40 PM   #4
Jeeper
 
tallzdatank's Avatar
 
Join Date: Sep 2012
Posts: 1,045
with respect, many people run those reusable air filters for years and years without trouble. many people, myself and Jerry included, don't like them at all. they are loud, and allow a lot more dirt and water in. remember more flow of air means more flow of everything else. if it isn't bothering you, and you don't spend A LOT of time on dirt or going through deep puddles, you can probably keep it and be ok. since it is there. but just remember for the same cost as k&n air filter cleaner/oil kits, you could've replaced the stock paper filter anyway, and inevitably you will loose the oil & cleaner before its time for use number 2.
tallzdatank is offline   Quote Quick Reply
Old 06-27-2013, 12:41 AM   #5
Jeeper
 
Tyr4nt's Avatar
 
Join Date: Oct 2012
Location: Columbus Indiana
Posts: 153
Quote:
Originally Posted by tallzdatank View Post
with respect, many people run those reusable air filters for years and years without trouble. many people, myself and Jerry included, don't like them at all. they are loud, and allow a lot more dirt and water in. remember more flow of air means more flow of everything else.
I also am in the camp that doesn't really see a good purpose for a K&N on a Jeep.

I disagree that "more flow of air means more flow of everything else." This statement is, however, definitely true for a oil-bath element filter (like K&N, et al).

With K&N you're friending and fighting centrifugal force at different times (engineers smarter than me - doesn't the conservation of angular momentum have something to do with this too??). When your engine is operating at high speed, sucking a lot of air, the air flows into the filter and makes a bend into the intake tube. At high speeds the weight of the particles of dirt/dust/rust-particles-from-your-friends-frame-in-front-of-you-on-the-trail/etc. cause the particles to get stuck in the filter better. This is because the high air velocity causes the particles to have higher momentum effected by centrifugal force than the air molecules, so the particles stick to the filter and the air passes through. This is fine - it's how the filter is designed to operate.

The issue becomes you're running low engine speed in dusty climates. At low air velocity the dust is not effected the same because the forces acting upon it are lower and the dust will have a greater tendency to follow the air through the filter.

This gets worse if you don't oil the filter as often as you should or if something has caused the filter to dry out pre-maturely (high dust load, exposure to water, prolonged exposure to direct sun, etc).

If you are in a vehicle with a self-heating MAF sensor, the excess oils from the filter can cause problems by sticking to the MAF wire and causing the sensor to report resistance incorrectly leading to bad air/fuel mix (can be corrected with alcohol & a Q-tip).

If you are running a diesel engine you are more exposed to the negative side effect of low RPM dust causing problems. Diesels, which can have compression ratios from 17:1 to 21:1, when introduced to dust, sand blast the pistons/rings/turbo impeller wheel. This is called a "dust-out". It doesn't take much unfiltered dust to bring a diesel engine to its knees.

Not trying to be a negative nancy here, I just don't think they're really the greatest option for what I envision as the typical Jeep duty cycle -- UNLESS YOU JUST WANT TO!! Jeeps are an open canvas and most of us mod them to be representative of our self expression with the machine.

I'd head to your local junk yard and grab an OE box & get the right filter --that's just me though.
__________________
~daniel
2000 Sahara
Tyr4nt is offline   Quote Quick Reply
Old 06-27-2013, 10:49 AM   #6
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,131
Images: 2
I wouldn't wish a K&N on anyone who wheels in dusty/dirty conditions. Not to mention a K&N doesn't flow more air in a TJ than the stock non-restrictive air box does which easily flows all the air the engine is pulling. A K&N will only flow more air when it replaces a restrictive air intake like some cars do have.

It's like having a 20 GPM (gallon per minute) pump getting its water from a hose that can flow 25 GPM and then expecting the pump to pump more than 20 GPM if you replace the 25 GPM hose with a 30 GPM hose.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 06-27-2013, 12:23 PM   #7
Wild Willys!

WF Supporting Member
 
All Terrain JK's Avatar
 
Join Date: Jan 2013
Location: MI
Posts: 1,814
I removed the K&N air filter the PO installed on my TJ as well. I didn't like having to cover it when I wash the engine bay. As already mentioned it was louder than the stock intake. I also didn't care for the cycle time of cleaning it. If you do it correctly it takes several hours for it to dry and compressed air is a nono. If you are going to run one, make sure it has an Outerwear. This will keep the larger particulates from clogging the filter media.
__________________
Mama's: '14 JKU Freedom Billet Silver, Trail Rated
Mine: '15 JK Willys Wheeler Billet Silver, Trail Ready!
Roads? Where we're going we don't need roads!
Frame off TJ restore project
All Terrain JK is online now   Quote Quick Reply
Old 06-27-2013, 12:26 PM   #8
Jeeper
 
Join Date: Jan 2009
Location: South Jersey
Posts: 923
My previous TJ had a similar so called cold air intake set up. I sold it which more than paid for all of the OE on ebay to restore it back to the OE system.
__________________
05 TJ Rubicon 4.88s ,2" BDS, Bilstein 5100, Currie Currectlync , Savvy arms/Metalcloak Duroflex joints, JKS BL, 33"Cooper STT's, Mc front Track Bar
Gary2 is offline   Quote Quick Reply
Old 06-27-2013, 01:20 PM   #9
Newb
 
Join Date: Jun 2013
Posts: 5
Also, if the filter is sitting on top of the block as i assume it is, its sucking nothing but hot air. My Jeep had the same set up with a spectre connected to the breather tube which had been cut with filter pretty much just above the alternator. Ditched it as soon as i could after reading many posts on here.
releaseme3 is offline   Quote Quick Reply
Old 06-27-2013, 02:33 PM   #10
Jeeper
 
Robertsk1's Avatar
 
Join Date: Jan 2013
Location: Stafford CT
Posts: 265
Quote:
Originally Posted by releaseme3 View Post
Also, if the filter is sitting on top of the block as i assume it is, its sucking nothing but hot air. My Jeep had the same set up with a spectre connected to the breather tube which had been cut with filter pretty much just above the alternator. Ditched it as soon as i could after reading many posts on here.
It's not directly on top of the block, I believe it's about 3 or 4 inches to the left (passenger side) of the block
Robertsk1 is offline   Quote Quick Reply
Old 06-27-2013, 07:09 PM   #11
Newb
 
Join Date: Jun 2013
Posts: 5
Close enough. Get rid of it.

releaseme3 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 10:04 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC