Originally Posted by graniteguy
I'm curious to your thoughts on running a shorter tube, keeping n mind heat is not a factor.
I hear what your saying / asking.
It really comes down to how you use the power and what you want to maximize. If your a slow speed off road-er type. I'd think that small efficiencies like this "CAI" really would not be a concern. I'd think mud/water infiltration would be most important.
Assuming you did want to maximize low end TQ with a true CAI.. you need to understand what the heat in the engine room does. (I've done a lot of studying on this subject with my Mustang & Lighting) Using temp sensors and yarn I've studied what does what.
The engine room heat flows in different directions at different times. The majority of it goes out and down past the headers. Even though heat rises.. this is where it goes when your moving. When your going 5-10mph it still flows rearward but not much. Sitting still and the heat pretty much rises until the engine room is full. Then it bleeds out around the hood and fenderwells. An e-fan when turned on will start to push heat out and down past the headers about like when moving 5-10mph. The heat coming off the rad pretty much bleeds out the front and heat soaks everything around it until air starts moving.
Adding a open and foward facing hood scoop does'nt really change this other than when sitting still. It does however pull less air across the radiator when moving! So does raising the rear of the hood or adding a cowl induction hood that's not sealed off. I found this very interesting actually! If you raise the rear of the hood or have a non-sealed CI hood.. the air will flow in in that area and sweep down past the firewall. This will lower temps overall but it pulls less air across the rad and front of the motor!
From a pure power standpoint on a 4.0L ranger driven at speeds under 80mph.. shortening the intake tube length won't mean squat. The TQ is mostly developed from the long intake runner lengths. Anything up streap of the TB really does'nt matter very much.. other than temps.
Since you have that scoop.. I'd shorten the tube as you like. Then encase the filter with a box and have the top open. Make a fiberglass panel that ducts the hood scoop air to the filter.