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Old 07-04-2008, 10:57 PM   #1
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Does any company out there make a cold air intake for the 2.9 or do you have to make one your self? I thought I seen somebody on here with one in there signature. Tim
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Old 07-04-2008, 11:10 PM   #2
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Ford makes one. You have it.
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Old 07-06-2008, 05:23 PM   #3
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I don't know about a cold-air intake. I kinda like the setup I have now. It seems to work pretty good.

I have taken off all the snorkle pieces from the exhaust manifold and the piece that goes to the core support. After that, I took the air-box out and cut a 21/2" by 7" rectangle hole in the side of the airbox that sits next to the fender. This leaves the engine plenty of cold air coming from right through by the back of the headlight.

Throw a K&N filter in the box, throw on an '86 or '87 58mm throttle body, and it'll scream!

With this setup on my '89 I've checked the vacuum at WOT and came up with a reading of right about 1 to 2 inches of vacuum. Anybody that knows vehicles knows that 0 inches is what you're striving for. I believe without even more mods, this is about as good as it gets.
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Old 07-06-2008, 05:31 PM   #4
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The OEM filter airbox is a CAI, as previously posted! The only thing the K&N will pass more than the OEM paper filter is dirt and oil! Stay with the OEM paper filter.
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Old 07-06-2008, 05:38 PM   #5
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I've acually seen quite a drop in the amount of dirt and dust that makes it past the filter since I've put the K&N in. The whole thing is keeping it clean and oiled. Also, the air temp coming into the intake manifold has dropped about 20 degrees since I've opened up the box and done away with the tubes running off the exhaust manifold, and close to it and the radiator. And, yes I HAVE checked these temps, and vacuum readings.

Performance has increased quite a bit too. There is a dyno shop in town that hosts an open dyno day a couple times a month. As embarassing as it may be, I'll post the figures as soon as I get the chance to run the truck.
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Old 07-06-2008, 05:59 PM   #6
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This was posted by AllanD in another K&N thread:

"Yes, but the factory air filter setup IS a cold air setup.

Hell even the original 2.9 setup had the air intake behind the grille.

Yes there's a preheater tube but that tube is CLOSED OFF most of the time.
Eliminating it can get you into legal hot water in terms of emmissions laws.

My brother LOVES K&N filters.
He will NOT use them on his own vehicle.

You see he is a Ford Dealer mechanic.

K&N filters make him more hours and thus more money.

Especially on the turbo diesels

Ever seen a turbo diesel that's bee run behind a K&N?

It's fugly.

AD"
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Old 07-06-2008, 06:22 PM   #7
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Quote:
Originally Posted by 89REDRANGER View Post
With this setup on my '89 I've checked the vacuum at WOT and came up with a reading of right about 1 to 2 inches of vacuum. Anybody that knows vehicles knows that 0 inches is what you're striving for. I believe without even more mods, this is about as good as it gets.
1-2 inches of vacuum at WOT is very, very normal for a STOCK 2.9L with a new paper filter.
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Old 07-06-2008, 06:27 PM   #8
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Measure the vacuum in the intake tube with the stock airbox and OEM paper filter at high RPM, and WOT. You will find that it will flow all the air the engine will pull, and you won't get any more air with the K&N filter, chicken wire, or no filter at all!!
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Old 07-06-2008, 06:32 PM   #9
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The only reason I run a K&N is because it was thrown at me when I bought the engine behind it. Almost as an afterthought the guy said "Here take this." It's handy since I can clean it out and put it back in.... Which I need to do since it was very dusty last time I went wheeling.

No way in hell would I shell out the $50 or whatever it is for the rumored .5 extra HP. It's a 2.9 - get real.
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Old 07-06-2008, 07:01 PM   #10
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Quote:
Originally Posted by Bob Ayers View Post
Especially on the turbo diesels

Ever seen a turbo diesel that's bee run behind a K&N?

It's fugly.

AD"[/I][/B]
Sure have, and yes it's not pretty.
My 2.9 has always had zero vacuum at WOT with paper filters.
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