Increasing Airflow From Passenger Fender To Intake

[06-3]

I have seen where Hummer Peeps have added a duct from the bumper area where a rectangular hole is for an optional fog light and routed it into the fender cowling . How about the chrome boxes next to the wind shield ? they are perforated at the bottom near the body , are they accessible to inside of the fender, or can they be ? most every GM car I have seen or owned has the air box vented to inside the fender...and usually always the fender area is gagged for fresh air....:shame:

 

[H3nightrod]

If you are wanting to get the as most fresh air into the air box maybe try a snorkel.

 

[alrock]

Why do you think your H3 isn't getting enough good air? The fender actually offers a couple of advantages - it's fairly protected from water and foreign materials. The air isn't flowing over the engine like it does in some other vehicles. I suspect the holes in the fake vents have less surface area than from where the current intake draws.

As nightrod said, if you want to increase air and the quality of the air, your best bet may be a snorkel with its large intake and draw from higher, cleaner air.

 

[06-3]

Well, if my Hummer was going to go swimming I would do that...but for street use and maybe some trails...dont want to cut a big hole in it for a snorkel...

 

[06-3]

http://www.hummer4x4offroad.com/forum/showthread.php?1891-Snorkel-kits


Looks like this has been kicked around a little already.....

 

[4speedfunk]

I have both a snorkel and an AirDoc. The snorkel itself won't get you any more airflow...but it will get the inlet up out of the water. Much like an exhaust system on a school bus...the longer the path of airflow is...the larger diameter it needs to be to maintain the same airflow. I didn't notice any change with or without the snorkel...but the 5-cyl is practically asthmatic anyway, so I'm not sure you would "feel" much difference. Any sort of "ram effect" is strictly b.s. unless you are travelling in excess of 200 mph.

However...I did take my air box apart and remove a small piece of the stock intake tube. The piece I'm talking about seems to act like some sort of orifice to limit airflow or something. Its a small plastic reducer, that seemed very restrictive...not sure why it is even there. Anyway...you can pull your air-box apart, yank that reducer, and put it back together so you can get full flow. You might have to fab up something from PVC to replace it. I did this mod along with (at the same time) installing the AirDoc, and THAT was much more noticeable than the snorkel. Its my understanding that this little reducer is not always there...some H3's have it...others don't. Mine is an 08 and it did have it.

One final note: None of this applies to Alphas...the intake system is completely different.

 

[08H3]

I ... Its my understanding that this little reducer is not always there...some H3's have it...others don't. Mine is an 08 and it did have it.

Also an 08, but mine never had the reducer. Guess that guy was on break on the assembly line when mine went through.

 

[RamRod]

There are a few DIY threads on here that bring that air intake up to the side hood "vents"

It involves some minor cutting of the fender... nothing that you will see once the "vent is clipped back in

 

[digglesworth]

He's got a volant intake so I don't think he's got the reducer, if he had one, anymore.... Reading that snorkel thread and seeing how the I5 is real sensitive to the amount of air flow, I'd leave it alone... People usually choose an enclosed intake system to keep mud, dirt and debris out. K&N makes one with an exposed filter and heat shield to help isolate the filter from warm engine air. But it's right next to the engine. How much can it really isolate. But everyone's got different needs and reasons for choosing which aftermarket parts to install.