Hood Vent Mod

[SRG963]

Not recommended for NEP OTR CAI kits due to hood water leak issues in some G8's.

Making a GRRRR8 mod a little easier http://forum.grrrr8.net/non-cgi/emoticons/smile.gif This mod will help in keeping the hot engine air away from your MAF sensor and allows your engine bay to vent.
With this mod, you should avoid parking uphill in the rain and don't follow closely in the rain. If you park on a flat surface or down hill and drive properly, you shouldn't have any problems.

1. Remove the rubber inserts from the inside of the hood. Please note, first picture is post mod with rubber inserts.
http://i297.photobucket.com/albums/mm227/srg963/P7280042-1.jpg
You can leave the rubber inserts out if you choose for more heat release.
http://i297.photobucket.com/albums/mm227/srg963/P7300044.jpg
2. Remove the hood vents, which lift out (or you can push them from the inside of the hood). Lift the outside edge (clip) and run you fingers along the inside of the hood vent to the other edge (clip) and lift. The back will lift up and then the front will slide out.
http://i297.photobucket.com/albums/mm227/srg963/P7280040.jpg
http://i297.photobucket.com/albums/mm227/srg963/P7280041.jpg
http://i297.photobucket.com/albums/mm227/srg963/P7280042.jpg
3. Remove black plastic backing from hood vents and leave off. There are small clips at each end. You will need to pull one side off first, the other will follow.
http://i297.photobucket.com/albums/mm227/srg963/P7280040a.jpg
4. (Skip to Step 6 second post for mod w/no rubber inserts) Switch sides of rubber inserts (right side to left and left side to right) if you choose to reuse them.
5. Place rubber inserts into the top of the hood back in the same openings, just upside down. Place the long side of the rubber insert under the metal lip at the front of the hood vent opening. You will need to press them back into the opening, don't be scared. Just a little pressure and they pop back in perfectly.
http://i297.photobucket.com/albums/mm227/srg963/P7280046.jpg
http://i297.photobucket.com/albums/mm227/srg963/P7280045.jpg
Push the rubber vent down into the opening.
http://i297.photobucket.com/albums/mm227/srg963/P7280044.jpg
See post #2 for final instructions

[SRG963]

6. Place the hood vents back where they came from.
http://i297.photobucket.com/albums/mm227/srg963/P7280043.jpg
When you put the hood vents back on, fit them in at the front before you push down to clip them in. This will avoid them sticking up.
http://i297.photobucket.com/albums/mm227/srg963/P7280040-1.jpg
7. Test new mod! :gears:http://i297.photobucket.com/albums/mm227/srg963/P7280041a.jpg




8. After removing the hood vents a dozen times, I've noticed them sticking up a bit on the corners. If you have this problem, there is a simple fix, but it may require a screwdriver or knife.

There are 2 metal clips on the back of each vent that need to be adjusted.
http://i297.photobucket.com/albums/mm227/srg963/P7310058.jpg
In the center of each metal clip, and on each side, there is a center piece of metal that needs to be bent out just a little
and may need to be pushed down to snug up the connection.
http://i297.photobucket.com/albums/mm227/srg963/P7310053.jpg
Take a small flat head screwdriver and place the tip behind the center metal piece and gently bend it back out.
http://i297.photobucket.com/albums/mm227/srg963/P7310054.jpg
You only want to do this just a little bit, that's all she needs.
http://i297.photobucket.com/albums/mm227/srg963/P7310057.jpg
You will bend a total 4 clips (2 on each vent).







and for anyone who does this mod without the rubbers, I drove in heavy rain for an hour
http://i297.photobucket.com/albums/mm227/srg963/P7310061.jpg
and this is how the engine bay looked
http://i297.photobucket.com/albums/mm227/srg963/P7310065.jpg
water only got on the box, so really there isn't much to worry about.

[GXPaycheck]

What kind of camera did you use for the closeups of the clips?

[SRG963]

<div>
(PaycheckG8 @ Aug. 13 2008,3:51)</div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">What kind of camera did you use for the closeups of the clips?</div>
Olympus 790SW

Same one I use for all my pictures, great little camera. Waterproof and small. If you use all the features, you can take some great pictures.

http://i297.photobucket.com/albums/mm227/srg963/P8090072.jpg

[Rican219]

NIIICE I will try no rubber thats the way I like it

[GeorgeInNePa]

NIIICE I will try no rubber thats the way I like it

[rimshot]

Thank you, I'll be here all week! Tip your waitress.


:bleh:

[EcoBrick Bob]

Did I do something WRONG????

I pulled out all of this from the underside of the hood. I also just squeezed the bottom rubber vents under the hood padding and positioned them towards the back of the engine. I have noticed small amounts of water coming in and dropping on to my engine while parked. MUCH....LESS....WORK!

So far... NO CODES!

RRM

[xfactor]

I dont understand the benefit of this mod. Can you please educate me?

While trying to decide on the G8 I was looking at a SRT8 Charger and I noticed that the air intake on the hood is funneled onto the headers. I would guess this would keep the headers a little cooler thus keeping the engine cooler. Was this mod of the same thought?

Has anyone ducted the air from the hood into any area? What results did you get?

[GRRRR8]

It is done to allow the hot air to escape.

[wreckwriter]

Very simple, allows a path for heat to escape when stopped. Heat soak is the enemy. A big difference? Nope, but well worth the 5 minutes it takes to do the mod.

[ddub_g8]

Did I do something WRONG????

I pulled out all of this from the underside of the hood. I also just squeezed the bottom rubber vents under the hood padding and positioned them towards the back of the engine. I have noticed small amounts of water coming in and dropping on to my engine while parked. MUCH....LESS....WORK!

So far... NO CODES!

RRM

I second this method. I removed the rubber vents and the plastic 'covers' for the scoops that blocked airflow. I did it from under the hood with just a regular flathead screwdriver. Since I live in Phx, AZ, it rarely rains, and opening up these scoops to vent out hot air in the summertime seems like a good thing.

[r33pwrd]

I like it! i dont see a problem with parking up hill? Water will not hurt the car at all. (unless you have a ram air that FILLS with water) water will not hurt the motor even if running. (obviously to much water can hurt) I got in an arguement with a friend about water and we ran my 240 for 20 minutes while spraying water in the intake and no problems what so ever. (mist of water)

[pkeplinger@unitedcommunit]

In the battle against heat soak, I have always removed the rubber strip that runs the width of the car at the top of the firewall allowing engine heat to escape between the firewall and the bottom of the back of the hood. This combined with the hood vent mod should make a difference.

[GRRRR8]

The rubber strip seems to help seal the rear to assist in creating the suction effect from the scoops. I tried a LOT of things before I did the scoops. I had the scoops done for a week or so before posting to make sure it worked. It sometimes sux to be the 1st to do things, you spend 3 times as much time testing then you do modding!

[screw991le]

Someone will come up with a ram air soon, if the demand allows it. Like the Charger's system, cold air to the headers to keep the heat from rising into the engine bay and lower your exhaust temps a bit.

[GRRRR8]

Someone will come up with a ram air soon, if the demand allows it. Like the Charger's system, cold air to the headers to keep the heat from rising into the engine bay and lower your exhaust temps a bit.

The scoops are a negative pressure zone. The highest pressure/airflow is at the bottom grill and why the Vararam system will work so well.

[99-LS1-SS]

The scoops are a negative pressure zone. The highest pressure/airflow is at the bottom grill and why the Vararam system will work so well.

So the scoops pull air from the engine bay right?

[BigRob]

I like it! i dont see a problem with parking up hill? Water will not hurt the car at all. (unless you have a ram air that FILLS with water) water will not hurt the motor even if running. (obviously to much water can hurt) I got in an arguement with a friend about water and we ran my 240 for 20 minutes while spraying water in the intake and no problems what so ever. (mist of water)

:headbang::headbang::headbang:

[GRRRR8]

So the scoops pull air from the engine bay right?

Correct.

[eliteautosport.net]

i just did mine yesterday but removed everything from under the hood and put the rubber pices back in like factory but now im going to switch them around..

[SRG963]

i just did mine yesterday but removed everything from under the hood and put the rubber pices back in like factory but now im going to switch them around..

Run without the rubbers, less to block air flow :)

[eliteautosport.net]

I was thinking about doing that but it kinda look's ugly with out them there so im trying to find some trim to put on there.

[StandFast85]

I was thinking of cutting the centers out of the under hood-trim pieces. That way they would cover the edges of the scoop but the centers would be gone, allowing the air to flow freely.

[beach]

I was thinking of cutting the centers out of the under hood-trim pieces. That way they would cover the edges of the scoop but the centers would be gone, allowing the air to flow freely.

Air is not going to flow in much and help, due to the aerodynamics of the front end. Nino had done quite a good job with the vents on his GXP and explained why/how in his build thread, a method that wouldn't be bad to follow or at least start with:

http://forum.grrrr8.net/showpost.php?p=74118&postcount=15

It's a dead zone air wise and really, given the layout inside I don't think you'd want direct air/water input, but setting them up like how it looks they'd work on Nino's and others to instead let heat get out is a nice start.

[StandFast85]

I like what he did also, I may have to change my setup. Thanks for the idea.

[steve b.]

is their another way of doing this so you get air and not rain

[gearhead455]

Very simple, allows a path for heat to escape when stopped. Heat soak is the enemy. A big difference? Nope, but well worth the 5 minutes it takes to do the mod.



With such a minimal effect in performance,I'd rather not worry about getting my engine watered down each time I drive in the rain.IMHO

[wreckwriter]

With such a minimal effect in performance,I'd rather not worry about getting my engine watered down each time I drive in the rain.IMHO

Very little water gets in. Only time I get a good bit is if I open the hood after a rain.

[Slizzo]

Very little water gets in. Only time I get a good bit is if I open the hood after a rain.

I agree, I've had the rubber inserts and plastic deflectors out of my hood since I got the car and saw what Shawn did. You only get a few drops on top of the radiator and air intake tube/box in the worst of rains; it'll dry up in about a half hour for the worst of what you will ever see.

[Derek98z]

I was thinking of cutting the centers out of the under hood-trim pieces. That way they would cover the edges of the scoop but the centers would be gone, allowing the air to flow freely.


Before ever seeing this thread, this is what I did. To me, it looks better when you can see in to the vent and it still looks backed.

[Panzer Leader]

Put in aradiator cover. Water wont get on anything of importance. I noticed that the ROTO FAB CAI for the V6 is on the backside. So with the cover on as well should not get water on it. Of course you could find a snorkeling kit from a Hummer and put that on.

[Marauder]

The scoops are a negative pressure zone. The highest pressure/airflow is at the bottom grill and why the Vararam system will work so well.

Hey Charlie, why do you believe the scoops are a negative pressure area? Just trying to relate this to the Ram Air function on my '69 GTO which ducts the air to the carb.

[J Wikoff]

When air moves over the front of the car, it is pushed upwards, pulling air out of crevices underneath the layer of moving air.

[Marauder]

When air moves over the front of the car, it is pushed upwards, pulling air out of crevices underneath the layer of moving air.

Yeah, like the cowl induction used in C3 Corvettes and Chevelles...perhaps if the scoop is tall enough it picks up the air just beyond the boundry layer. We actually had to richen up carb to compensate for the working ram air on the goat.

[BeamMeUp]

I was also able to do this mod completely from the underside. Pushed hard on the small clips with the flat blade screwdriver to remove the plastic backings. Then pushed the rubber inserts back in and used the screwdriver to reshape them through the holes.