Drilling holes in cylinder shaped airbox

[Lifted95X]

Just wondering if anyone has tried drilling holes in that type of airbox and if it had actually made a difference or not.

 

[yob_yeknom]

I've done it. I can't say it made some hugely noticeable improvement. It does sound better though. When you stomp the gas at idle you can hear it suck in the air like an old carbureted V8 sounds. It made the engine just slighty louder like it has more power.
It has to help a little bit, even though you probably won't ever notice it.

 

[Lifted95X]

Do you only drill them around the bottom??? And about how many holes do you actually put in??


Sorry...just saw your pic.....is that screen that you put on the inside???

 

[yob_yeknom]

You only drill on the bottom half where the air filter is. If you unclip the box and lift up the side with the hose connected to it, the part you drill will be the part left clipped down to the fender with the air filter in it.
There is no special way to drill it, just put as many holes in any size that you want. I drilled mine only on the front to help keep hot air from around the engine from getting in.
Yes, that is metal screening from an old screen door. I glued it in behind the holes with plastice adhesive. I put it there to keep big chunks of mud from being able to get in the holes while four wheeling.

FYI: When drilling, start off with the smallest bit you have and work your way up a bit at a time until you get to the size bit you want. The plastic will crack and break out big chunks VERY EASILY if you use too big of a bit and try to drill out a lot at once. Trust me! The reason the bottom half of the box is a darker black than the rest is because I broke out the entire area with the holes by using too big of a bit. I then had to JBWeld it back together, sand it smooth, and paint it.

 

[Lifted95X]

Thanx a lot for your input.

 

[yob_yeknom]

Glad to be of assistance.

 

[Bill Kemp]

I may be too late but anyway...
On the cylindrical type air box you really don't have to drill any holes.
Just remove the air box and clamp down on the retaining ring that holdes the filter in place.
This will hold the filter without having the air box on.
Totally open filter....

 

[Frshpwdr2k]

Hey Bill,
I was reading somewhere on this site a while ago that just exposing the filter without the air box can actually have negative side effects. Wouldn't it just be sucking in hot air from the engine and dirt, grime, and bugs? Anyone else know?
-BRoderick

 

[Bill Kemp]

Yes it will be sucking air from under the hood and all that other stuff also just like the KKM & the K & M fipk filters. When you drill the air box it also sucks in all of the above. You just get more air.
Or you can open up the intake area of your air box to allow much more air in and add a duct to direct more air into the intake opening which is behind your headlight.
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I used the aluminum 4" dryer vent going from the air dam opening to the intake air opening.

 

[Frshpwdr2k]

Looks good

Bill -
How does that set-up work out for you? Noticed any significant gains in horsies or gas mileage or engine sound? THanx
-BRoderick

 

[Bill Kemp]

I cant really say that it has created any noticeable gains in performance or mileage. Sound isnt much different.
Now that I think about it; why the hell did I do it?
It may just be me but I dont notice much performance difference with the air box on or off.
One day I hope to get to the strip for a few runs and see if there is a difference.
However anyone will tell you that a car runs better on an abundance of cool air and that is what I have tried to do.