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Unread 05-15-2006, 09:42 PM   #1
sociald
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Cold Air Intake For An 89" XJ

After searching high and low I've found that no makes a cold air intake for for an 89' XJ only 91' and above. Would I be able to use a 91' after maket cold air intake on my 89'? I would keep my stock air box for smog reasons so that wouldn't be an issue, just swap it out when smog time comes. I just need to know if the 91' cold air intake will attach to my stock 89' intake elbow or am I stuck with making my own?

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Unread 05-15-2006, 09:58 PM   #2
JoJo97XJ
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get a K&N filter and, some pvc pipe and a flexible elbow and make your own, it will be cheaper and probally just as good
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Unread 05-15-2006, 10:08 PM   #3
sociald
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That would work and I guess I would make a heat shield (box) with some tin and heat insulator for the actual filter part to sit in. Should be a fun project... if I don't F' it up
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Unread 05-15-2006, 10:57 PM   #4
twisted_ed
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the reason no one makes one, is because the pre 91s used a system where when it is a certain temprature (cold) a vacume operated switch at the front of the airbox closes off the entrance to the box and it sucks warm air off the exhaust manifold. Manufactuers dont seem to want to touch this type of setup.. apparently plugging off the vacumm line and removing the box is too hard for engineers... but at any rate, remove the box, chase the vacumm line to the engine and remove it and plug the hole and you now have a 91+ style... but you will still have to make a setup, cause the 91 plus also use a hose clamp to attach the air intake tube to the throttle body and 90s and older use three torx head cap screws to hold the tube to the throttle body, do like above, get yourself some abs pipe and make your own, or get rustys airtube..,. but its still not cold air so like you said, you will need to make a heat sheild or somthing.
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Unread 12-31-2011, 08:08 PM   #5
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http://rustysoffroad.com/mm5/merchan...y_Code=PER_AIR I am thinking of buying this one for my cherokee... any suggestions...I also have the 1989 and this picture shows that it has the sensor and every thing to hook for around 80$ when buying the K&N filter...
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Unread 12-31-2011, 08:50 PM   #6
djb383
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Wow......a 5 1/2 yr old thread......and that's a HOT AIR intake if there ever was one.
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Unread 12-31-2011, 11:52 PM   #7
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Cold air my a**. Do cold air intakes really deliver cold air to the system? IMO, probably not. Even if you have a shield of some kind, once the engine compartment heats up the air that enters the system will be hot. IMO the idea is to get more air into the system. I have a Rusty's tube and a K&N filter and it works great.
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Unread 01-01-2012, 06:31 AM   #8
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Why not hop on the zombie thread...

More airflow also means more dust into the engine with a K&N. You are getting less filtration, period. That adds up to more wear and more oil changes at a minimum. Unless you get a pre-filter to go over it, which most dont realize is supposed to happen, and then you are really getting spendy.

Most engines wont ever see the benefits of a larger air intake, not without other various mods. Now with a bored throttle and some exhaust work, it will do a good bit to get some extra air flow, at least that stands o reason. Also, if you are looking to move the intake for water resistance, that really stands to reason and if you go with a snorkel with heat shielding, that's going to be your best "cold air" pull.
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Unread 01-01-2012, 04:55 PM   #9
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a cold air intake on any 4.0 wont do anything. the exhaust manifold is directly under the intake manifold, so the second any air reaches the valves you can be 100% sure the air is not cold in any way.
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Unread 01-02-2012, 02:37 AM   #10
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doing this : remove the box, chase the vacumm line to the engine and remove it and plug the hole and you now have a 91+ style
In California will cause you to fail smog. which is the reason you do not see them
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Unread 01-02-2012, 02:59 AM   #11
Godfrii
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Hey all.
I'm new to the jeep forums. I do have some questions about the forums and my k&n air filter.
I bought a k&n for my '99 grand cherokee and the rigid pipe that goes from the filter to the What i think is the throttle body has a small outlet or valve (about a 1/4" dia.) which is permanently open right near where it connects to the throttle body. I don't know what it is for so I'm thinking of plugging is to prevent dust and stuff from getting in through it. Below is a pic of the device and uou can see the outlet. Does anyone know what the outlet is for?
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Unread 01-02-2012, 03:01 AM   #12
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Oh and sorry if I'm posting in the wrong place. I don't know how to use the app and forums yet.
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Unread 01-02-2012, 09:40 AM   #13
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Quote:
Originally Posted by david92xj View Post
a cold air intake on any 4.0 wont do anything. the exhaust manifold is directly under the intake manifold, so the second any air reaches the valves you can be 100% sure the air is not cold in any way.
Thats why you get some heat sheilding under the intake manifold, its been done with doccumented results.
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Unread 06-17-2013, 01:44 PM   #14
DZINE
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Quote:
Originally Posted by optdoug View Post
Cold air my a**. Do cold air intakes really deliver cold air to the system? IMO, probably not. Even if you have a shield of some kind, once the engine compartment heats up the air that enters the system will be hot. IMO the idea is to get more air into the system. I have a Rusty's tube and a K&N filter and it works great.
yea, the idea of a CAI is to deliver cold air into the intake, do most kits do this? (Maby not) but if you where to make your own true cold air intake by bringing the inlet around to the front of vehicle allowing it to breeth fresh clean cold air, there would be a massive difference in performance.
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Unread 06-17-2013, 07:32 PM   #15
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I just used the stock air box on my '96 - the opening for the air box is a couple inches behind the radiator header, which has a matching (plugged) hole just ahead of the air box inlet. When I had the headlights out prep'ing for a paint job, I removed the plug, so now fresh air should flow from in FRONT of the radiator / behind the headlight right into the stock airbox. I'm certain this will provide cooler air than any aftermarket CAI that doesn't include a snorkel or true ram air inlet (which I wouldn't run on an XJ because it would be subject to water ingestion, the last thing you want to have happen).

FWIW, I do believe in ram air, and installed a ram air system on my '78 GMC motorhome (the swoopy front wheel drive classic), feeding air from a collector just inside the grille, off to the side of the radiator.
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