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Old 01-25-2020, 12:46 AM
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How Important is a Hood Vent?

Most of the off-roading would make rush hour traffic look like flying on the Interstate. It is slow and relies on the fan to keep the radiator, oil coolers, and a/c condenser cool. Meanwhile, the engine is hot, the air that passes through the various heat exchangers is hot, the exhaust is hot.

The Rubicon special editions all came with vented hoods. AEV also adds a vented hood. Other Rubicons have a flat hood with no venting.

Adding one on the aftermarket is expensive. The hood itself is at least $500, and then there is the need to have it fit and painted. Some hoods are significantly more than that.

How important is having the hood vent? Is it important enough to focus the search on a Hard Rock, Recon, or Rubicon X? Is it important enough to make a priority among the modifications? Or is it unnecessary?

This DV8 hood costs $600 for the hood itself. While some vents are a bit less expensive, by the time hood is painted they are all expensive.





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Old 01-25-2020, 12:49 AM   #2
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I dont know that it's "important", but it doesnt hurt. We added a Posion Spyder hood louver on our JK to let some of the heat out and our TJ has a vented AEV hood..

Less heat is better IMHO..

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Old 01-25-2020, 07:23 AM   #3
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Take a close look at the “vents” on a Hard Rock hood and you will find that they are mostly a closed plastic insert with only a very small opening that I believe was placed more for water drainage than for heat escape. That hood was designed for appearance, not functionality.


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Old 01-25-2020, 08:12 AM   #4
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Take a close look at the “vents” on a Hard Rock hood and you will find that they are mostly a closed plastic insert with only a very small opening that I believe was placed more for water drainage than for heat escape. That hood was designed for appearance, not functionality.


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Can always just Dremel out the ‘closed’ vents, and make them functional. One consideration might be cold rain entering from the top on a hot engine, or even mud just clogging up the vents and getting in the way on top of your engine. You can get stainless steel louvered panels and install them to the rear of the hood, towards the sides. Or make or have fabricated your own. Might be easier and cheaper than a new hood, and adds a custom touch. Lets out any excess heat. Just an idea.
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Old 01-25-2020, 08:26 AM   #5
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I have a 75th Anniversary with the vented hood. I used a dremel tool to cut the plastic inserts. They are wide open now. Thay have been that way for 2 years, not one issue. I also live near Chicago where we get pretty decent storms. Cold rain, warm rain no issues. It also got rid of the hood flutter on the highway.
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Old 01-25-2020, 08:38 AM   #6
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I am aware that the vents can be modified to be functional. My point to the OP was that Jeep does not offer a factory hood with functional venting for heat dissipation. So Jeep does not feel it is a necessity even on its most off road capable trim levels.

If you feel that hood venting is a necessity or benefit, then you either need to replace the factory hood with one manufactured with vents or modify your factory hood, which requires cutting metal on a standard hood or plastic on the “vented” hood.


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Old 01-25-2020, 08:58 AM   #7
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Maybe I am ignorant, but it seems to me the factory could make functional hood vents on the Rubicons instead of the decorative vents, if it made a difference.

I was watching a video the other day of a fellow replacing the vents with functional vents. Interesting that the under hood insulation has depressions that drain water to the side.
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Old 01-25-2020, 09:19 AM   #8
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Can't hurt to add it.. but more importantly.. make sure nothing is blocking air flow to the grill... winch set down low in the frame etc.. no big lights diverting airflow etc..
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Old 01-25-2020, 09:31 AM   #9
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Feel your battery after you've driven w/o a vent for a couple of hours and that should give you your answer.
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Old 01-25-2020, 09:34 AM   #10
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Living in Phoenix AZ (117*F with no clouds is common during summer), having a black Jeep, with a stock hood it's hard for me to understand the underhood heat issue. The Jeep has yet to run warm, much less get dangerously hot, and I'm running stock cooling system, a winch that blocks the radiator and 37's that add strain.
Now, maybe auto's run hotter, mine is a manual.

Having said that, when I did the fenders last year, I went with vented liners... while I never had an issue prior, I figured it would not hurt.
If we wheeled mud, I'd have gone with solid/un-vented liners... thankfully, not much for mud around here.
Photo of the liners in case that is an option you want to consider... much cheaper than a hood/paint, and a tone of free area vs a hood.
If you'd like to see more photos, shoot me a PM.
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Old 01-25-2020, 09:39 AM   #11
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RubiconSS started a thread on the topic, which is now a very long thread:
https://www.wranglerforum.com/f274/r...e-1380609.html
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Old 01-25-2020, 09:49 AM   #12
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Maybe I am ignorant, but it seems to me the factory could make functional hood vents on the Rubicons instead of the decorative vents, if it made a difference.

Absolutely true.
And the only reason I can think of that they don't is that they don't seem to be too concerned about under the hood temps, which makes me kind of wonder if it's not a slightly over rated topic.
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Old 01-25-2020, 10:05 AM   #13
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Not needed! But I have vented hood just because I like the thought of heat being able to escape easier. Has made no difference in operating engine temps running on or off road.

But they do look cool and isn't that what it's all about.
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Old 01-25-2020, 11:21 AM   #14
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I don't think that hood vents are necessary at all (I have them), and I live in the desert. Look no further than the winches, bumper hoops, and huge auxiliary lights that people mount right in front of their radiators. If heat buildup was a problem, that blockage would be much more problematic.
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Old 01-25-2020, 11:29 AM   #15
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No! Thats why I have one.
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Old 01-25-2020, 11:59 AM   #16
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The other thing to consider is that none of these under-hood-temp threads ever seem to demonstrate any significant change in under-hood temperatures.

There was an older thread where someone posted manufacturer measurements from a couple different companies. If I remember right, the largest impact was from installing all three Daystar vents -- one across the front and one at either side by those bumps where the windshield lays. Installing just those two still had a decent impact, and just the front one didn't make much difference.

I can't find the thread but I remember thinking the difference didn't seem large enough to convince me to start chopping up the hood.
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Old 01-26-2020, 04:46 AM
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I stand corrected. I thought the vents were functional. And it seems they aren't needed.

Has anyone actually had a higher temp with stuff in front of the grill? The reason I'm skeptical is because of the very low speeds. Air should primarily be sucked in by the fan and anything 3"-4" in front of the grill probably isn't a factor.

Now running down the highway that would be different.

Update: I have two links about it that say it is vented...I will have to look for myself.

https://smokeythejeep.wordpress.com/...-vented-hoods/

https://www.rubitrux.com/mopar-power-dome-hood.html
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Old 01-26-2020, 05:13 AM   #18
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Old 01-26-2020, 05:14 AM   #19
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Remove the hood wheather strip and it would give you a nice "vent".
Lifting or trimming fender liners will also provide some nice "vents" at the cats.
As for the hood - looks cool, but imo standart looks more "jeep".
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Old 01-28-2020, 08:29 PM   #20
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does yer Jeep run "hot" ? if it does, then you might be able to use some venting. if not, you don't really need it.
if you want it for how it looks, there are a few that you can install on yer hood, with some cutting. you can always spray bomb it to match (difficult) or offset (easier) the color of yer Jeep. flat black tends to reduce glare, not that you'd need that but it looks good and doesn't cost much.
it's yer's. do what you want with it. in the long run it will cost less to leave it alone.
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Old 01-28-2020, 08:48 PM   #21
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I live in hot as hell a Phoenix, hood vents are not a must..IMO But like others have said, it can’t hurt anything.
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Old 01-28-2020, 09:56 PM   #22
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Even if it's not needed, a lot of heat comes out of the modified 10A hood vents. I got my aftermarket hood for $350 and paid $250 for paint.
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Old 01-29-2020, 12:29 AM   #23
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Can always just Dremel out the ‘closed’ vents, and make them functional. One consideration might be cold rain entering from the top on a hot engine, or even mud just clogging up the vents and getting in the way on top of your engine. You can get stainless steel louvered panels and install them to the rear of the hood, towards the sides. Or make or have fabricated your own. Might be easier and cheaper than a new hood, and adds a custom touch. Lets out any excess heat. Just an idea.
Such a good idea for one of these aftermarket companies to make a 100 kit on that you just dremel it the hood add plastic louver that clips on.
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Old 01-29-2020, 06:26 AM   #24
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Such a good idea for one of these aftermarket companies to make a 100 kit on that you just dremel it the hood add plastic louver that clips on.
The Daystars I mentioned earlier that seem to work well, although I'm not personally a big fan of how they look:

https://www.amazon.com/Daystar-Wrang.../dp/B00JXU217S

https://www.amazon.com/Daystar-Wrang...dp/B00JXU2F9C/
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Old 01-29-2020, 06:49 AM   #25
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I suppose that if engine cooling is really effective, we would see a big difference by just removing the hood. Engine temps are regulated by the enclosed cooling system(s) that maintain the operational temps the engine needs to run optionally.

If your cooling fluids are bubbling over or your temperature gauges are registering higher than normal temps I think the issue is in the system(s) and not the air blanket that is blowing through the compartment.

The biggest and best air mover is the fan WHEN it operates correctly (with or without the hood in place). Afterall there is that big gapping hole under the engine ...

Just an ole mans perspective :-)
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Old 01-29-2020, 09:25 PM   #26
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I had a Poison Spyder vent on my old TJ and it did allow a lot of heat to escape so I installed the Rubi style hood on mine. I cut the bottoms off of the vents just to see if it would help on the trails and when crawling around the temperature readout is lower. Is it required??!? Probably not. My Jeep has never overheated but I feel like it can’t hurt. AEV makes a nice heat reduction vented hood they use with some of their hemi powered Jeeps I was looking at prior to getting the Rubi style hood.
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Old 01-29-2020, 10:34 PM   #27
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I did it, and I like it.

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Originally Posted by ClayWelder68 View Post
Can always just Dremel out the ‘closed’ vents, and make them functional.
A 2015 Hard Rock here, named The Copperhead. I did exactly that, took a Dremel and a cutting wheel and opened up the vents. It took a while to decide if it helped or not. I believe it did, the fan doesn't seem to come on quite as often as before. As to operating temps, the thermostat kind of regulates that. Sure, there is a huge gaping hole under the motor. But heat rises, and when I am crawling through the desert, I can sometimes see heat waves shimmering out the hood vents, more so than over the hot hood. That alone tells me it did something. As you can see, NOTHING is blocking my air flow to the radiator. I just won't even think of that.

As to the question of cold rain getting on the engine..... maybe..... but the vents are over the big plastic decorative cover on top the motor. So the rain will hit the cover, not fall directly on the motor. So.... Did it help? I think so. Did it hurt anything? Not that I can see. But I live in the desert. It's January and today's high was 62° F. Didn't need the open vents today. But I will in July!

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Old 01-30-2020, 03:25 AM   #28
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I'm amazed anyone worries about "cold rain". The engine is barely hot enough to boil water. If water could transfer heat so quickly you'd crack the block, or warp heads, or whatever the concern is, then your coolant would work so well we wouldn't be having this conversation.

And of course, we've all seen things like this:



Or my buddy's '32 which has been driven in the rain plenty of times:



As long as you don't add a big opening over your fuse box or SPOD or the like, it won't matter.
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Old 01-30-2020, 11:23 AM   #29
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What about the other items under the hood? Heat on electronics can`t be good. Batteries?
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Old 01-30-2020, 03:39 PM   #30
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I suspect that removing the hood altogether wouldn't impact engine operating temperature.
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