Adding ORO York onboard air

[Stinkbug]

I am not looking for performance gains from a new intake, rather, I am specifically looking to making room where the factory box is to hang a second compressor next to the passenger side mounted A/C compressor using the ORO kit for 1997-98 4.0 with factory air conditioning.

In looking at the K&N setup for a 1997 TJ it seems that their tube will essentially put the filter in the same location as the factory air box if it is not significantly trimmed. For those that have done this, is the tube a constant diameter that allows trimming and easy connection of the filter at any point on the tube or are adapters necessary?

Is it possible to just trim the stock intake and stick the K&N cone filter on it and still be within the CARB guidelines.

 

[Alex01]

I am not looking for performance gains from a new intake, rather, I am specifically looking to making room where the factory box is to hang a second compressor next to the passenger side mounted A/C compressor using the ORO kit for 1997-98 4.0 with factory air conditioning.

In looking at the K&N setup for a 1997 TJ it seems that their tube will essentially put the filter in the same location as the factory air box if it is not significantly trimmed. For those that have done this, is the tube a constant diameter that allows trimming and easy connection of the filter at any point on the tube or are adapters necessary?

Is it possible to just trim the stock intake and stick the K&N cone filter on it and still be within the CARB guidelines.

I trimmed my tube and it was a constant diameter. You can see where I put it in the first photo I attached in this thread.

Here's another carb legal option that would free up even more space.

I haven't heard of anyone running it but if I would have known it existed I likely would have went this route.

https://trailheadoffroad.com/product/wrangler-tj-lj-cowl-intake-97-06/

 

[alittleoff]

For mine, when it was registered in CA. and because of the York OBA and the placement of my OBW, the factory air box was removed and a partial Banks intake was used. At our local smog check shop, our smog lady was only concerned that the crankcase breather was plumbed into the intake tube.
They didn't care how or what the air was being filtered through.
Up here in MT. there's no smog check.
The local LEO's don't really care if you run a full blown race motor, because in their off time their cruising in their own gas or diesel guzzler's.
Gear heads like horsepower.

 

[DrDmoney]

I have decided to add an onboard air system to my 1997 TJ with a 4.0. After much consideration, have decided to use the ORO kit. I understand that the compressor may be a bit smaller than others have used but I feel it will be right for me and my needs plus it allows the continued use of the stock air box and does not appear to need a coalescing filter (unsure in this part).

The kit comes with a length of steel braided line to deal with the hot air coming out of the compressor that I will use to take it to a manifold. From there, I will:

(A) Run a line to each side of the Jeep to couplers on the frame below the doors to allow a short hose to be used to fill tires and blow out the interior. In this scenario would it be best to run one line back to the passenger side (same side as compressor), split it and run it across to the drivers side or run one line from the passenger side and one line across the firewall and the down then driver side frame?​

​

It seems that going down each frame rail would allow the hose to be more firmly secured vs crossing under the frame but I would like to hear / see what others have done.​

​

OR​

​

(B) Simply run one line down the passenger side frame rail and one to the front bumper. To me this is less than ideal for two reason (1) it is not tucked away and out of sight (2) Not a deal breaker but would need a longer airline to inflate tires / blow out interior.​

​

OR​

​

(C) Some great line routing suggestion that comes out if this thread.​

​

Thoughts? Pictures?

Mine still spits a little oil and it’s one of the newer compressors.

Having two places to fill at is a good idea but I think the front and rear like @Plumber1 is more versatile.

 

[NskLJ]

Is it possible to just trim the stock intake and stick the K&N cone filter on it and still be within the CARB guidelines.

Technically no. “Modifying any emissions component is illegal “ There are intakes that have a CARB certification so those would be legal. Cutting it down you would get into the area of modification from how that intake was certified. Now if a inspector would notice or fail you for it that’s a different story but it’s their license and freedom on the line.

 

[Jerry Bransford]

Is it possible to just trim the stock intake and stick the K&N cone filter on it and still be within the CARB guidelines.

No.

 

[Stinkbug]

I used the kit as it came but added an oil catch to mine since it was spitting some oil. From there I ran a hose down to the bumper to make a remote fill location.

View attachment 357787

View attachment 357788

View attachment 357789

Did you have to do anything to support the KN intake? In your picture it appears to only be clamped to the throttle body but trimmed too short to be zip tied to the grill support rod. Maybe it is light enough not to need additional support?

 

[Jerry Bransford]

Did you have to do anything to support the KN intake? In your picture it appears to only be clamped to the throttle body but trimmed too short to be zip tied to the grill support rod. Maybe it is light enough not to need additional support?

I installed a K&N many years ago and it sat fine on the air intake tube without further support. That said, a K&N air filter is a REALLY shitty air filter, it barely filters at all. I ended up installing TWO pre-filters over the top of the K&N so it would at least do some filtering.

This is what I did to mine, they are pulled up on the K&N so you can see how they are layered. A foam Unifilter covered by a K&N Precharger. I had first installed the K&N Precharger but it was so bad at sealing and keeping the dirt from getting in from the side that I added the Unifilter over the top of it to hold it down.

That said I'm glad I no longer have to run a K&N air filter since my previous TJ with the York OBA system was stolen. I now run a CO2 tank with my replacement TJ. Did I mention a K&N is a really shitty air filter?

 

[Stinkbug]

I installed a K&N many years ago and it sat fine on the air intake tube without further support. That said, a K&N air filter is a REALLY shitty air filter, it barely filters at all. I ended up installing TWO pre-filters over the top of the K&N so it would at least do some filtering.

This is what I did to mine, they are pulled up on the K&N so you can see how they are layered. A foam Unifilter covered by a K&N Outerwear. I had first installed the K&N Outerwear but it was so bad at sealing and keeping the dirt from getting in from the side that I added the Unifilter over the top of it to hold it down.

That said I'm glad I no longer have to run a K&N air filter. Did I mention they are a really shitty air filter?

View attachment 364158

View attachment 364159

I am aware of the well deserved hatred for the K&N filter. I have the K&N intake tube an carb sticker but am planning on running a AEM Dry Filter 21-2949DK filter with the hope that it simply does it’s job…

 

[Jerry Bransford]

I am aware of the well deserved hatred for the K&N filter. I have thr K&N intake tube an carb sticker but am planning on running a AEM Dry Filter 21-2949DK filter with the hope that it simply does it’s job…

That's essentially the same thing as a K&N so far as its ability to filter goes. I'd still install the pre-filters over the top of it. There will be no noticeable different in performance or mpg with them installed and the peace of mind with them installed make it well worth to install them.

 

[Alex01]

Did you have to do anything to support the KN intake? In your picture it appears to only be clamped to the throttle body but trimmed too short to be zip tied to the grill support rod. Maybe it is light enough not to need additional support?

I did make a support. It's attached to the tube under the worm gear and bolted to the fender (I believe). I'll try to remember to get a shot of it later tonight.

If Jerry says you're fine without one though I'd believe him.

 

[diggerwolf]

Question: why are we concerned about a little mist of oil in our tires?

 

[Alex01]

Question: why are we concerned about a little mist of oil in our tires?

The mist of oil in the tires isn't what annoyed me. It was the oil dripping out of the hose after use and getting all over everything it got near that drove me insane. The inline oil filter really helped with that issue.

 

[Jerry Bransford]

Question: why are we concerned about a little mist of oil in our tires?

It was messy and dripped out the hose which is why I installed an oil separator when I was running a York.

 

[Ocho]

I am aware of the well deserved hatred for the K&N filter. I have the K&N intake tube an carb sticker but am planning on running a AEM Dry Filter 21-2949DK filter with the hope that it simply does it’s job…

i switched to the windstar intake to have more space for my york and keep my k&n tube and filter for smog tests. i remove the windstar and put the k&n on in the parking lot, smog, then switch back.

 

[Wildman]

Question: why are we concerned about a little mist of oil in our tires?

I was told that the oil was bad for the rubber in tires. I don't claim that this is true or not but it's what I was told. And as others have said it's the mess it makes also.

 

[MikeE024]

CA requires a visual check of the vehicle during the smog test and if anything important like the air intake, catalytic converters, etc. are aftermarket it will fail the visual unless the aftermarket part, like a CAI system with a K&N air filter, has a valid CARB sticker.

Which is just one reason I bailed out of California this past May.

I assume this was low on the list of reasons for why you left.

No way a significant reason for you leaving the rocks was due to CA requiring a CARB sticker for aftermarket parts especially when the rules had been established for quite some time now.

With that said, the CA rules can be annoying and I hope Florida is treating you well.

 

[Stinkbug]

Thanks for all the suggestions. It is working like a charm. I originally bought the K&N intake since I need something CARB approved. I could not stand the noise that thing made and was not looking forward to the subpar filtering. It is now sitting on the shelf to be trotted out every other year to pass smog.

I replaced that K&N with a Buick 3.3 intake off a early 90’s Century and fitted it up to a trimmed stock intake tube.

The install did require trimming the inner fender a bit and making a new grill support rod.