4bangerjp.com
General Forums => The Mess Hall => Topic started by: dexetr30 on August 14, 2006, 08:16:00 AM
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Ok, I took some time to throw it all together yesterday afternoon. Here is what I've got.
This is the overall picture. I used some 3 inch pvc pipe, two rubber 90 degree bends with hose clamps and a cheep reusable air filter from pep boys. I'll replace the filter in the future with a K&N.
(http://i47.photobucket.com/albums/f194/dexter30/DSC00832.jpg)
I used a 6 inch and 4 inch hose clamp to attach the filter end to the support rod that runs across the engine bay. That way the filter end of the intake isn't just flopping around aimlessly under the hood.
(http://i47.photobucket.com/albums/f194/dexter30/DSC00834.jpg)
This image is without the crancase ventilation hose hooked up yet. I just slid the 90 degree rubber bend over the exsisting rubber boot that the original air box was connected to on top of the throttle body. The other way it could be done is to carefully slice the wide end of the elbow right where it tapers to the smaller diameter and then connect the smaller section that's left to the throttle body. I hope this makes some sort of sense. I'm not good at explaining this stuff, just doing it.
(http://i47.photobucket.com/albums/f194/dexter30/DSC00831.jpg)
In the end it has a crisper throttle response on the bottom end from a dead stop. It pulls a bit better all the way up to about 3500 rpm. It does seem to be getting a bit to much air for the size of the throttle body though. We'll see how it performs after I get a 4.0l throttle body on it within the next few months. It was worth the work and it sounds pretty cool. However, I do think that the next time I build one of these I will make it from 2.75 i.d. exhaust tubing. 3 inch works fine but for the 2.5l engine with stock size throttle body and stock exhaust it's does seem like I'd get better response from a bit smaller size tubing. I could be wrong though. It's a learning process. :thumb:
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is that carb legal??? :P
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Ya know, I'm really not sure. I'm not up on the emissions laws even in my own state.
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Problem I see is that it's going to suck up a lot of hot air without any baffels to seperate the engine and radiator heat from the intake. I believe some of the hottest air gets stuck in the front corners. You might also want to heat shield the PVC. Depending on what type you bought, it might dryrot and crack over time. You'd also be able to shorten the whole thing if you were able to keep it on the driver side.
You will need to run it for a few weeks before being able to tell any difference. It's still running as if the air box was there and should take a while to relearn.
Here's something un related. Why is your vacuum line to the brake booster wrapped up like a ? mark?
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Jeffy, I was actually thinking of cutting it a bit shorter and swinging it to the drivers side. My reason for this is that long piece of pvc has got to be slowing the air down (because of it's length) on it's way to the throttle body. I'm still considering replacing the pvc pipe with some galvanized or maybe even some aluminum if I can find it cheep enough. You're probably right about the baffles being needed. For some reason I didn't even think of that.
After I installed the whole thing, I disconnected the negative battery terminal and turned the key forward in hopes that doing so would reset the ecm to some point.
As far as the brake booster line... :nothing: It was like that when I bought the Jeep and I didn't even notice it until I posted those pictures. Now it's driv'n me nuts. I'll have to cut it and slide it back on the correct way when I get a chance.
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I'd just rotate it it's at 9 o'clock The extra is fine especially if you plan on doing a body lift later on.
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Hmmm, 9 o'clock may give me a bit of trouble when accesing the oil filler cap. then again, it sits high enough that it just may not. I'll give it a shot.
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Ya know, I'm really not sure. I'm not up on the emissions laws even in my own state.
I was just playing!
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Hmmm, 9 o'clock may give me a bit of trouble when accesing the oil filler cap. then again, it sits high enough that it just may not. I'll give it a shot.
No, I meant the brake booster vacuum line.
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Got it. Yeah, I was looking at body lifts today and found one I really liked. Just a heads up... I'm more than likely going to get pizza cutters when it comes time for the tires. Don't worry though, I'll be making fun of myself also. :wink:
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Have any ideas on best way to make baffles around the filter?
I attached a Rock-it tube and cone filter to the end of my stock hose and it ends a lot like dexetr30's. I didn't just using the Rock-it tube because it was to loud for the wife. :evil: It also seemed to get real hot sitting over the engine. I like using the stock tube and the rather just the straight Rock-it tube because it does hang further right then the PVC and is already designed to be there.
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hmm...does anyone know if a stock 4.0 tube will fit in place of the 2.5?
on a TJ I mean, I have been wondering about this.
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hmm...does anyone know if a stock 4.0 tube will fit in place of the 2.5?
on a TJ I mean, I have been wondering about this.
Yes, it will work on the 2.5L. The only reason the 2.5L has a different air tube is for noise.
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hmm...does anyone know if a stock 4.0 tube will fit in place of the 2.5?
on a TJ I mean, I have been wondering about this.
Yes, it will work on the 2.5L. The only reason the 2.5L has a different air tube is for noise.
really? that's it? A guy from my gym just got an intake for his 4.0 and mentioned that I could have his old stock on if I wanted. maybe I'll try a home made intake of my own and post some pics up. thanks.
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Holly crap!!! Why didn't I just do that to begin with?! Ok, now I have to go to the scrap yard and find a stock 4.0 liter intake tube and junk the pvc.:asshat:
Ok, in my defense... It's been years since I was under the hood of a 4 liter. I completely forgot how simple the intake rounting is on those engine. Oh well, I did say it was a learning process. :lol:
Look at how much that tube simplifies things::oops:
(http://a137.g.akamai.net/n/137/3538/20021023160153/www.cars.com/features/mvp/jeep/rubicon/images/enginetight.jpg)
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hmm....I wonder if you could use the 4.0l tube, and then add your own cone filter to the end of it and remove just the top of the stok air box and use the bottom half as a makeshift heat shield. With a little modification, I wonder if it would work. :?:
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I think it would work just fine with a little planning and some modding. I'm ordering a 4.0 L intake from ebay this weekend and having another go at it.
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wow i dint even think of that even after watching my dad put a k&n air filter in his rubicon which is a 4l.. that would be way easier.
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hmm....I wonder if you could use the 4.0l tube, and then add your own cone filter to the end of it and remove just the top of the stok air box and use the bottom half as a makeshift heat shield. With a little modification, I wonder if it would work. :?:
Some people cut off the flexy end and put a filter there but I can't see it being that good. It would be hard to build a box since it's over a huge area. Modift the opening on the box and you could get just as much air in.
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on our old cj3a it had the stock oil ari filter on the pasenger firewall were the battereis go on the new yeep and we took that out and just put a k&n cone over it in some thabric protector thing and it seems to be working good..
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wow i dint even think of that even after watching my dad put a k&n air filter in his rubicon which is a 4l.. that would be way easier.
Yes but putting a stock sized K&N filter in the box to replace the original filter (if that is what you meant) is different than replacing it with a reusable conical style filter. Conical filters have more surface area so the throttle body ends up getting more air.
On another note...I don't see things being also difficult to try and make the stock air box into a ram air type system. Just take the horn shaped inlet out, replace it with 3" flexible hose and route it to somewhere that gets fresh moving air. You can just leave the stock filter right in the air box or even replace it with a K&N.
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ya i know its different buit i was saying that i didnt notice that the airbox was on the other side of jeep so they had the tube going over the motor.
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I'm using on of those EBay jobs -- "3" aluminum intake tube + no oil K&N-type filter-- that I bought for $30 about a year ago. Its ok. Just search under "Jeep intakes" on EBay.
But, today I just bought a stock Jeep 2.5 airbox and tube off Ebay for $25 for emissions purposes. Threw original one away because I had already cut in to the thing, so it wasn't really stock any more by a long shot.
May go back to the air box setup permanently -- torque will improve as will brake firmness, probably. Also won't hurt when going up against CARB emissions testing later this year.
I miss the torque, what little of it there was pre-open filter, too :lol: Course, now there's going to be less high end on highway on ramps. But we are talking a 2 solid axle ride here, not a sports car.
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ya i know its different buit i was saying that i didnt notice that the airbox was on the other side of jeep so they had the tube going over the motor.
Personally, I don't like the route it takes over the exhaust manifold. It heats the air coming into the intake make it less dense befor it enters the throttle body. It's ok in the winter for those cold mornings but otherwise... I don't think it's so great.
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I'm using on of those EBay jobs -- "3" aluminum intake tube + no oil K&N-type filter-- that I bought for $30 about a year ago. Its ok. Just search under "Jeep intakes" on EBay.
But, today I just bought a stock Jeep 2.5 airbox and tube off Ebay for $25 for emissions purposes. Threw original one away because I had already cut in to the thing, so it wasn't really stock any more by a long shot.
May go back to the air box setup permanently -- torque will improve as will brake firmness, probably. Also won't hurt when going up against CARB emissions testing later this year.
I miss the torque, what little of it there was pre-open filter, too :lol: Course, now there's going to be less high end on highway on ramps. But we are talking a 2 solid axle ride here, not a sports car.
A blower or turbo would be nice for those on ramps. Of course... that's more cash than I have to throw at my Jeep right now. :cry:
(http://www.ajeepthing.com/images/avenger40.jpg)
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Well, it also helps that that Jeep has an extra pair of cylinders, too.
As for freeway onramps, my Jeep seems to be awfully quick. Although I'm reving it higher and shifting for power. The problem I have is when the Jeep gets over 45-50. Getting it up to 65 takes a little while since I've got to merge in and not run into any slow cars or cut off faster ones. This is one oe the reasons why I think a centrifugal would work nicely.
BTW: if the air box is removed, you will need to replace it with something that has a CARB sticker. Snorkels get around this btcause they leave the stock airbox.
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Well, it also helps that that Jeep has an extra pair of cylinders, too.
I thouht I had originally posted this one also... Guess not. 4 Banger:
(http://www.ajeepthing.com/images/avenger25.jpg)
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Can I use Homer twice?? Drool....
(http://i24.photobucket.com/albums/c33/SMC4WD/homer-drool.gif)
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there we got the 4banger...
wow taking it all the way up to 65 hundred :yikes: .. i dont think my motor would handle that anymore.. ill get it up to 4grand but not over it... and other people do get anoying cux ether i have to go all out or im slow and cozing traffic jams :uhoh: ...