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Chris D
Dodge Dakota
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6/15/2004
21:46:35
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 Subject: ? about intake
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Hello everyone. I have an '02 3.9L. I've been deciding on whether or not to buy a cold air intake and after doing searches and reading posts on this site I have decided not to buy one. Instead I plan on removing the snorkel tube from the box and the rubber flap next to radiator and replacing the air filter with a drop in k&n. would this be the way to go or should i leave the flap and snorkel and just go with the drop in? also what size drop in would i need? and would rain be an issue once i remove the rubber flap and snorkel? Thanks.
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daddio
Dodge Dakota
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6/15/2004
22:21:59
| RE: ? about intake
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remove the flap & snorkel. also cut a 4.5" - 5" hole in the airbox where the snorkel was. it works for me and no problems with rain or water.
my 2 cnts.
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daddio
Dodge Dakota
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6/15/2004
22:22:14
| RE: ? about intake
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remove the flap & snorkel. also cut a 4.5" - 5" hole in the airbox where the snorkel was. it works for me and no problems with rain or water.
my 2 cnts.
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99DAK
Dodge Dakota
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6/15/2004
23:32:59
| RE: ? about intake
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Chris, if you do as daddio advises then I don't think you'll see much difference between the paper filter and the K&N - the airbox itself is by far the biggest restriction. And as I'm sure you already know, a bigger TB also will make a world of difference.
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Chris D
Dodge Dakota
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6/16/2004
00:01:08
| RE: ? about intake
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Thanks for the input guys. So 99DAK you don't think there would be any noticeable difference between the paper filter and the K&N? I'm not concerned about mpg just mainly increase in performance. And yes I've been thinking about the bigger TB.
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GB2000
GenIII
6/16/2004
00:28:18
| RE: ? about intake
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Really the airbox isn't causing so much restriction...especially if you do as Daddio advises and cut a larger diameter hole in it. What causes the most restriction is that stupid ribbed intake tube going from the box to the airhat.
Josh
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99DAK
Dodge Dakota
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6/16/2004
10:34:29
| RE: ? about intake
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Chris, based on my experience only, I don't think so. I put a cone filter on initially and it made a very noticeably improvement. You don't care about mpg but the only hard numbers I have for comparison are +2mpg over stock setup. I started reading about the more flow/less filtration debate and switched back to the stock airbox. Cutting the larger hole in it produced the same +2 mpg and performance gain as the cone.
I remember seeing some flow comparison numbers somewhere and the difference between the paper and K&N drop-in was less than 10%.
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99DAK
Dodge Dakota
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6/16/2004
10:46:42
| RE: ? about intake
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Josh, could you talk some more about the flex-airhat tube? I know alot of people have said that the ribs in the flex tube cause turbulence and slow velocity, but has anyone (yourself possibly?) actually done a controlled, real-world comparison to test the theory?
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Chris D
Dodge Dakota
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6/16/2004
15:52:42
| RE: ? about intake
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Alright, well I took off the snorkel and rubber flap today. Have yet to drive the truck since, but im goin to town in a little while so I'll see how it does then. I'm gonna go with 99DAKs advice and run the paper filter and see how it does for now. If I decide to later on then I may go for the K&N. No use spendin the money if I don't need to though. Thanks again guys.
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Bob Lincoln
Dodge Dakota
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6/16/2004
16:21:37
| RE: ? about intake
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I went from paper to K&N drop-in, no measurable change in mpg; very, very slight improvement in mid-range power, and it sounds more truck-like. I'm going to cut open the air intake flap in the grill to let more straight air into the tube. Will report back on results.
My goal is any mpg improvement, for as little money and time as possible. It's a spare/3rd vehicle for me.
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GB2000
GenIII
6/16/2004
19:08:00
| RE: ? about intake
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99Dak,
Never done a test on it, but it makes sense to me... those ribs are large and you know a lot of the incoming air has to be catching in there slowing down and probably restricting some of the air going in. With a straight tube, the air can go straight in with very little restrictions. Speaking of which, I wonder how restrictive the stock airhat is as well since it's larger than the diameter of the throttle body (the approx. 1 inch "lip" around the sides). It would be interesting to run an accurate test on the flow of the stock ribbed tubing vs. straight tubing...and also a "modified" airhat that just fits the diameter of the throttle body vs. the stock airhat. Anyone here know how to set up more of a lab test to measure the airflow using fairly cheap materials...including measuring devices?
Josh
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99DAK
Dodge Dakota
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6/17/2004
00:37:53
| RE: ? about intake
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Josh, what you're describing is how Jeep inlines are - no airhat, just tube right into the TB. Wonder why the hat on the Magnums? For looks?
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99DAK
Dodge Dakota
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6/17/2004
00:47:17
| RE: ? about intake
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Ya know, come to think of it the Jeep 4.0 6cyl is like 190hp and 230lb/ft, hey, maybe you're onto something! ;-}
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Bob Lincoln
Dodge Dakota
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6/17/2004
08:23:28
| RE: ? about intake
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Of course, the question arises when thinking about air restriction: Why did K&N make their drop-in filter about an inch smaller in diameter than the stock paper filter? Seems it should be the same size, at least.
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JFH
GenII
6/17/2004
08:42:40
| RE: ? about intake
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I have already done a similar test with the air inlet hoses. While a smooth pipe will flow much better than a ribbed flex pipe, your engine could not possibly bring in enough air to notice the retriction unless you were running some type of boost.
I used 3" Dia. on the flex tube and 2" on the smooth.
http://www.cardomain.com/memberpage/546400
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GB2000
GenIII
6/17/2004
10:19:58
| RE: ? about intake
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Hmmm....good point...though I think I see some flaws in that (just can't figure out how to put it in words). I need to do more thinking and if I figure anything out, I'll post again so we can all discuss it further.
Josh
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Bob Lincoln
Dodge Dakota
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6/17/2004
12:28:02
| RE: ? about intake
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"While a smooth pipe will flow much better than a ribbed flex pipe, your engine could not possibly bring in enough air to notice the retriction unless you were running some type of boost."
But that's just it. Laminar (smooth flow) will make a difference compared to the additional resistance that turbulent flow yields. How much difference? Remains to be seen. But it has to help.
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AF
Dodge Dakota
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6/19/2004
23:24:19
| RE: ? about intake
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ive heard that the K & N FIPK for the v8, fits the 3.9 also. is that true???
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mickw82
DakotaEnthusiast
6/20/2004
18:16:24
|  RE: ? about intake
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well as for my two cents, i didnt know what i wanted to do juss like the rest of us and we all got diff opinions, so i went to the local O'Rielly and bought a round air fliter, i think its like a mr. gasket of some cheap crap.. its under 20 or 30 bucks ... hell even edelbrock has a triangle air fliter that fits, well n e ways i took the air box the tube and even the round box on the top of the engine off and put on this on ... its not a cold air intake so im not getting top end, but its more like a warm air intake and gives a few more horses... no restriction from all that other crap in the way .. this sits striaght ontop of the TB and when u gas it hard, u actually hear it suckin in all that air with no restriction ... like it or leave it ...its my opinion!
Mick
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GB2000
GenIII
6/20/2004
21:18:14
| RE: ? about intake
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Yeah, that's what I have too...well, I'm using a round Edelbrock one. I love it...sounds great and makes the V6 look like it's got balls.
Josh
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p2gee
Dodge Dakota
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6/21/2004
13:06:53
| RE: ? about intake
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I put a K&N drop in on my 01 a couple of weeks ago. Off idle response is noticably better and on two tanks of gas showing about .5 mpg improvement. Will probably try the FIPK when get coins up. Bold experimenter that I am.
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