Snorkels
JK Super Freak
Joined: Feb 2009
Posts: 1,236
Likes: 0
From: Pittsburgh, PA
JK Junkie
Joined: Mar 2011
Posts: 2,145
Likes: 4
From: Israel
After eliminating those which lack venting efficiency or structural strength, here are the cooling hoods which I think are the better ones:
TOTL Innovations
This one seems to be the most efficient, but its' looks is something you either like or hate.River Raider Hi-Flow Hood
Available in a durable gel coated fiberglass or carbon fiber finish.
RK Sport 07-12 Jeep Wrangler Carbon Fiber Top Ram Air Hood
Truck Master Designs – Cold Air Induction Hood
Notice that not all of them have the holes for the windshield washer nozzle.
As for the snorkel --
I chose the RR as I think it's the best design.
For water fording I find the low mount to be good enough, no need for the high mount.
For driving in thick sand dust left by another vehicle, the high mount intake is located in somewhat cleaner air.
However, no regular snorkel air intake filters the finer/lighter sand dust.
A TopSpin pre-cleaner by Donaldson (3"), really prevents thin sand from reaching the air filter and plugging it. It's also self-cleaning, so no need to empty it.
Last edited by GJeep; Jan 6, 2015 at 07:41 AM.
JK Jedi Master
Joined: Mar 2007
Posts: 14,800
Likes: 374
From: Midwest City, OK
I'm not going to offer an answer to this question, but perhaps a request that might be informative for a great many of us. I use an Android app Torque Pro to monitor my Jeep's can bus. There are a variety of things I can read, but a couple are germane to your question. That is, ambient air temperature (directly off the sensor, so it doesn't go through the TIPM logic that freezes the reading until after a certain amount of time) and intake manifold temperature. On my Jeep with an old-style AEV snorkel, the difference between those two temperatures is typically 8-10°. It would really be nice to know what the difference is for a Jeep with a 3.8 that doesn't have a snorkel. And, by taking these measurements before and after adding a snorkel, and then the heat reduction hood, you could have a better idea of how effective each of these devices is. And I would love to post in those "Which CAI" threads with some hard numbers, LOL!
JK Junkie
Joined: Mar 2011
Posts: 2,145
Likes: 4
From: Israel
Hot air is compressed mainly right under the hood and against the firewall, from where it has no escape. It doesn't flow down, because it floats above cooler air.
That's why hood vents should be located near the firewall:
Attachment 590798
That's why hood vents should be located near the firewall:
Attachment 590798
JK Jedi Master
Joined: Mar 2007
Posts: 14,800
Likes: 374
From: Midwest City, OK
Hot air is compressed mainly right under the hood and against the firewall, from where it has no escape. It doesn't flow down, because it floats above cooler air.
That's why hood vents should be located near the firewall:
<img src="https://www.jk-forum.com/forums/attachment.php?attachmentid=590798"/>
That's why hood vents should be located near the firewall:
<img src="https://www.jk-forum.com/forums/attachment.php?attachmentid=590798"/>
JK Junkie
Joined: Mar 2011
Posts: 2,145
Likes: 4
From: Israel
The hottest air was, unsurprisingly, under the hood next to the firewall.
The engine bay of Wranglers is hotter than in other 4X4s. The engine - and around it - also warms up quicker than any vehicle I've ever driven.
Besides, see where snow on the hood melts first. It's on the curved sides of the hood, towards the rear.
Why not at the rear, center? I'm not sure. Maybe at that place the snow at the center is surrounded by more snow than at the sides, which slows melting.
Knowing how ventilation works, forced or by convection, that's where, under a Jeeps' hood, the hot air is captured. It's the highest place under the sloping hood, and it has no exit.
Hood makers won't publish the numbers, because, first, those may not be impressive enough to persuade people to buy the hood.
Secondly, there is no one fixed set of numbers to begin with.
Under-hood temp' depends on outside temp', and on wind speed and direction - and those constantly change relative to the Jeep.
As I said, I haven't yet replaced the stock hood. If/when I do, I'll check the before/after temp'.
I even consider a different solution -- forced venting on the stock hood.
Here are some options I thought about:
Last edited by GJeep; Jan 6, 2015 at 08:37 AM.
JK Freak
Joined: Feb 2013
Posts: 605
Likes: 0
From: MI
I haven't replaced the stock hood yet, but combed the possibilities and kept the results.
After eliminating those which lack venting efficiency or structural strength, here are the cooling hoods which I think are the better ones:
TOTL Innovations
This one seems to be the most efficient, but its' looks is something you either like or hate.
https://www.jk-forum.com/forums/spon...-274796/page9/ post 81
https://www.jk-forum.com/forums/spon...-274796/page9/
River Raider Hi-Flow Hood
Available in a durable gel coated fiberglass or carbon fiber finish.
River Raider Hi-Flow Hood
RK Sport 07-12 Jeep Wrangler Carbon Fiber Top Ram Air Hood
RK Sport 07-12 Jeep Wrangler Carbon Fiber Top Ram Air Hood Free Shipping
Truck Master Designs – Cold Air Induction Hood
Truck Master Designs JK780-H - Truck Master Designs? Cold Air Induction Hood for 07-15 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec
Notice that not all of them have the holes for the windshield washer nozzle.
As for the snorkel --
I chose the RR as I think it's the best design.
For water fording I find the low mount to be good enough, no need for the high mount.
For driving in thick sand dust left by another vehicle, the high mount intake is located in somewhat cleaner air.
However, no regular snorkel air intake filters the finer/lighter sand dust.
A TopSpin pre-cleaner by Donaldson (3"),, really prevents thin sand from reaching the air filter and plugging it. It's also self-cleaning, so no need to empty it.
JK Jedi Master
Joined: Mar 2007
Posts: 14,800
Likes: 374
From: Midwest City, OK
Years ago we checked the temp' at 4 points in the engine bay of another 4x4, front center, rear center, sides right under the hood.
The hottest air was, unsurprisingly, under the hood next to the firewall.
The engine bay of Wranglers is hotter than in other 4X4s. The engine - and around it - also warms up quicker than any vehicle I've ever driven.
Besides, see where snow on the hood melts first. It's on the curved sides of the hood, towards the rear.
Why not at the rear, center? I'm not sure. Maybe at that place the snow at the center is surrounded by more snow than at the sides, which slows melting.
Knowing how ventilation works, forced or by convection, that's where, under a Jeeps' hood, the hot air is captured. It's the highest place under the sloping hood, and it has no exit.
Hood makers won't publish the numbers, because, first, those may not be impressive enough to persuade people to buy the hood.
Secondly, there is no one fixed set of numbers to begin with.
Under-hood temp' depends on outside temp', and on wind speed and direction - and those constantly change relative to the Jeep.
As I said, I haven't yet replaced the stock hood. If/when I do, I'll check the before/after temp'.
I even consider a different solution -- forced venting on the stock hood.
Here are some options I thought about:
The hottest air was, unsurprisingly, under the hood next to the firewall.
The engine bay of Wranglers is hotter than in other 4X4s. The engine - and around it - also warms up quicker than any vehicle I've ever driven.
Besides, see where snow on the hood melts first. It's on the curved sides of the hood, towards the rear.
Why not at the rear, center? I'm not sure. Maybe at that place the snow at the center is surrounded by more snow than at the sides, which slows melting.
Knowing how ventilation works, forced or by convection, that's where, under a Jeeps' hood, the hot air is captured. It's the highest place under the sloping hood, and it has no exit.
Hood makers won't publish the numbers, because, first, those may not be impressive enough to persuade people to buy the hood.
Secondly, there is no one fixed set of numbers to begin with.
Under-hood temp' depends on outside temp', and on wind speed and direction - and those constantly change relative to the Jeep.
As I said, I haven't yet replaced the stock hood. If/when I do, I'll check the before/after temp'.
I even consider a different solution -- forced venting on the stock hood.
Here are some options I thought about:
