Custom Intake "Horn"

[Greenleaf]

Well guys, it's in the works. After much discussion and thought, I have the parts on the bench and have made some cuts. I have some welding completed and things are looking good. (I'd have finished if I'd stay off the darn TDR)



This is how it's shaping up; 3" short radius elbow, Nelson # 89091A. Also need;

3" to 2. 5" adapter O. D. to O. D. Nelson # 89253A

Using the factory tube from IC to the "horn" along with turbo hose and clamps.



I have disabled the grid heat relays and removed the old "horn" and heater grid/box. The heat grids don't look like such a restriction as does the "horn" it's self.



A 1/2" steel plate will be cut to adopt the new 3" "horn" to the intake manifold. I'll use the same style/diameter bolts to hold the new assy in place, however the bolts will have to be shorter, 1 5/8" long as opposed to the original 3 3/16th inch.



The new "horn" will fit the intake opening... ... . "Like-a-glove" :-laf Also, the original parts are left undisturbed. Good thing if you need to re-convert it. The whole unit will clear the hood's insulation by a half inch or so (when the hood is closed) Setting the new elbow on top the grid heaters won't allow enough clearance to close the hood.



No pics as I cant post the darn things :{



GL

 

[bgilbert]

How bout this one I picked up off a freightliner p-pump 5. 9? Didn't have grid heaters. It has a 3" inlet, 6" tall, 6" across top. What is the inlet size on 91. 5-93 IC'd horn?

 

[BushWakr - RIP]

Scott, shoot me the picture(s) at my home email and I'll size 'em and post them for you bud...



pb.

 

[Greenleaf]

OK Bob, thanks. I'll try that. I guess I have your e-mail address somewhere?... ... ... ...



I had originally thought I'd install that part in the above pics. My Cummins powered Thomas buses use IC's with 3" pipe along with the same part pictured. They too have no grid heaters. I found I could make my own for a few $



Our truck's factory IC pipe and intake horn is 2. 5 inches. What I don't like is how the 2. 5" forms a square housing inside the horn assy. This is a real eye opener. I'll take a pic of the factory horn next to a 3" elbow.



I'm using a heavy wall exhaust pipe. The elbow's inside diameter is already polished. Should be a nice transition from IC pipe to intake manifold.



I will not have any dyno results, however..... every little bit helps.



GL