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Dodge Dakota
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8/14/2007
02:39:17
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 Subject: 4.7 Cold Air Intake V3.0
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After making a few 4.7 V8 cold air intakes (well actually only the last one was a true CAI) I decided to do something a bit different on my new/used 01 Durango. On my old 03 DAK I made an ABS intake pipe with a huge K&N filter, then fabricated a heat shield out of sheet aluminum to keep the engine heat from the intake air. This worked really well since there was a significant difference between the temp of the pipe inside the shield and outside the shield, checked one day when I was driving in 125 degree temps ;-)
The Durango has different AC plumbing which prevents me from using the old setup so I decided to try something different. At Lowes I found a 3" "LONG" ABS 90 street elbow which has a very slow turn and a nice smooth transition inside. When I got home I noticed this was a perfect fit going from the throttle body into the air cleaner. I cut a 4 1/2" piece of 3" ABS and angled each end at 45 degrees on a horizontal belt sander, beveled the outside on one end and the inside on the other end. Next I glued the outside beveled end of the ABS pipe to the 90 degree fitting, this made a nice smooth and almost seamless transition into the elbow. WOW, what a difference between the air path of the old air hat compared to $10 worth of ABS. The air tube is connected to the throttle body with half of a 3" Fernco "no-hub" adapter and to the stock air box with the stock rubber accordion tube. I also glued some foam padding onto the end of the air box's inlet tube to seal it against the fender so it wasn't sucking in hot air from the engine bay.
I remember reading on DD.com that the stock air filter flows more than enough air for the 4.7 so I'm not too concerned about a high flow filter at this point, might opt for a K&N drop in later.
Since K&N's 4.7 Dak/Durango FIPK has a tube which eliminates the sharp transitions and protrusions of the stock air hat, (very similar to my ABS tube) I wonder how much better K&N's $250 FIRK is compared to my cobbled up ABS tube and stock air box?
list of materials;
1- Nibco 3" LONG 90 degree street elbow,,, $5
1- 2' peice of 3" ABS (need 4 1/2"),,, $5
1- Fernco 3" "no-hub" adapter (cut in half),,, $5
1- ABS cement (had it),,, $2
Making cheap power,,, PRICELESS
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