GMC Hood Question

[Glava2876]

I was looking at the engine in my 2020 GMC this past weekend and noticed that the front edge, at the center of the hood, has a removable piece.

I looked at it more and the area just behind it has a chamber, that is sort of slotted on the bottom to allow air to enter from the grill.

The inlet for the air filter is way off to the right.

It almost reminds me of my 75 Trans Am, that had a plate on the back of the shaker hood that could be removed and that would increased airflow to the carb and the Q jet low frequency tone noise could exit.

I am going to take mine off of the GMC and see if it sounds better or anything -anyone already done this?  

[RadoPhan]

If there’s cutouts behind that I would imagine that it helps block airflow and push to the driver’s side where the forced air is pushed to the intake, so taking it off may negatively affect it and the cutouts are just going into the hood and not intake anyways.

 

 

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[Jav_eee]

I’m gonna guess it does nothing unless there out cutouts to let the air through. Looks like air has no place to go once it enters. Unless it’s supposed to do a 180 and flow out the front (holes that aren’t covered)?


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[TVelar]

Looks to me like it is deflecting the air down into the radiator through those slats

[2016 Sierra Owner]

This was a GMC design thing. They implemented on the previous gen trucks. I believe it's just cosmetic. I've seen it referred to as the mailslot.

 

[Thomcat]

Nothing more than a composite design to reinforce a thin aluminum hood. Wouldn't make much of deflecting a cold airflow supply as an aluminum heat sink sucking up heat from the engine and hot Summer Sun.

[Glava2876]

So the way it works out is that when you remove this piece, it leaves it totally open where it was plugged by the plastic filler -it is not a diverter etc., it just blocks this space, making it look like an opening.

When removed, air can enter that gap and get into the section just behind it with the slots in the bottom.

The rear of this space has the second seal to the hood, so noting gets to the under hood area behind it.

It looks like the slots in the bottom of this space, and some of the hole on the leading edge of the hood, are the normal path for the air flow -eventually finding the opening way up and over to the right DS.

With this gap open, the air would be Rammed into this chamber and get to the filter inlet faster?

And since the filter inlet is so far to the right DS, rain or snow wouldn't be entering.

Not saying it would make a big difference, but it is interesting that it is designed this way.

If you have a 2019 or 2010 GMC take a look and see if this makes sense.

Edited April 15, 2020 by Glava2876

[Zeak]

I didn't read through the string so apologize up front if already answered. I think the ram air is only functional in the diesel model. The diesel needs the extra air but the gas model doesn't. I think there is a special designed chamber in the diesel intake to separate the rain water and debris from entering the engine. Removing the blocked vent on a gas engine is likely to just dump rain and snow on your engine when driving in inclement weather.  

 

As a side note, I hate the hood design on the GMC 2500. I wish they would remove the pretend scoop and make the hood lower. It would give better visibility. I think this poor visibility will be a big problem when snow plowing.