In-Cab Snorkel - TTORA Forum
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post #1 of 10 (permalink) Old 04-05-2017, 10:14 PM Thread Starter
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In-Cab Snorkel

In my reading of other's in-cab snorkel projects, I did not find much info on what setup would actually fit under stock 1st Gen Taco fenders. I saw a writeup on hiding one under 3" extended fiberglass fenders and a few 2nd Gen Tacos but the closest I could find to what I was about to do was a 3rd Gen 4runner. In order to help others wanting to go this route, I'll try to share as much detail as I can here.

To get some FAQs out of the way: yes it fits under the fenders, yes the fender liner still fits, yes I hear it in the cab.

On to the project-
Step one, remove passenger side fender.
After some mocking up and some trial and error, I decided I needed to retain the entire stock setup that resides inside the fender in order to clear at the front end where real estate is at a premium. I left the stock horizontal intake tube in place in order to dial in lengths and angles of the tubing.

Next, bore a big freakin' hole through the side of the body into the cab. I built my snorkel out of 3" ABS plastic available at your local big box store. The "ABS to body adapter" I fashioned out of a toilet flange. The toilet flange needed to be cut down on the side that would be inside the cab in order to clear the blower motor and duct work under the dash. The 90 elbow (street fitting- only has a coupler on one side) will attach to the opposite side of what is intended so the lip inside of the toilet flange needed to be removed as well. As luck would have it, the stock intake tube fits PERFECTLY inside 3" ABS. I cut one of the couplers off of a 45 elbow and worked it on to the intake tube. I then test fit a section of pipe between the elbows and marked everything with a silver marker so that I could clock it properly when I went to glue it all together. Once it was call cut, shaved, sanded, and indexed, I glued the 90 elbow into the toilet flange. I then used a heat gun to adjust the flange so that it fit the contour of the body. I also needed to trim about 40% of the flange off on the door hinge side for clearance.





Once I was happy with everything I used ABS cement to glue it all together (just the 3" pipe I was adding, not the ABS to the stock intake tube). Now that I had my snorkel built, it came time to silicone the snot out of everything. I worked from intake side to engine side installing each piece as I went. I did not skimp on the silicone between the body and the toilet flange. It made for messy fingers when bolting it in, but I know it's water tight (I removed the door so that I could get the nuts on the back side by myself). I even siliconed the mating line between the 90 elbow and the toilet flange because I wasn't sure if the ABS cement's integrity was compromised when I heated the flange to form it.



Now that the toilet flange was was sitting exactly where the stock antenna used to reside, I needed to get creative. Again with the heat gun, I formed a piece of PVC then slid the stock antenna mounting rod inside and glued it in place.



Once everything was siliconed together (including the stock intake pieces all the way up to where they meet the air box) and the new antenna mount was in place, it was time to try and get the fender to fit. I knew it should fit because I mocked it up about 15 times throughout the process, but now that it was all actually connected, it was the moment of truth.



AND THE FENDER LINER EVEN WENT BACK IN!!!!! ...but it did take some work to get it in



Now, as for the in cab noise- One person's thread claimed it was so loud they couldn't stand it and removed the system. I can not hear it under normal driving conditions. When I get higher up in the power band or really stand on the throttle, it sounds like I've got a fire breather under the hood. I have made several long road trips and it didn't bother me once. I was bombing down a sandy wash and keeping the R's up in a lower gear so as to keep moving through the silt and it started to get a little droning but still not aggravating. Once I make a trip pulling my cargo trailer loaded down, I'll update the noise report. As of right now, no complaints.

It's always a work in progress...

Build thread: http://www.ttora.com/forum/230-expedition-builds/143519-desert-dd-expo.html
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post #2 of 10 (permalink) Old 04-06-2017, 08:08 AM
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Excuse my ignorance, but what is the benefit of this? Solely as your engine air supply?
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post #3 of 10 (permalink) Old 04-06-2017, 08:32 AM
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Climate controlled CAI...?
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post #4 of 10 (permalink) Old 04-06-2017, 01:38 PM
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Do you keep a window cracked open to help even out the vacuum effect? I would think that if you had your vents on recirculate that the intake would pull in more air than the fresh air flow vents would naturally allow in, since they are designed to just flush in enough air so that passengers don't suffocate and the windows aren't always foggy.
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post #5 of 10 (permalink) Old 04-06-2017, 10:03 PM Thread Starter
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Originally Posted by partyman666 View Post
Do you keep a window cracked open to help even out the vacuum effect? I would think that if you had your vents on recirculate that the intake would pull in more air than the fresh air flow vents would naturally allow in, since they are designed to just flush in enough air so that passengers don't suffocate and the windows aren't always foggy.
I can run with the windows up. Plenty of air comes in through the vents. There are also vents behind the cab (between the bed and the cab). I have hit the recirculate button and not died. It has been so nice out (winter in Arizona ) that I have just been letting the fresh air in. Once summer hits, if I can't keep the in cab temperature below 100 without recirc, I'll probably do the deck plate mod on the air box and plug the intake tube. Then I'd just put the deck plate in and unplug the intake tube/ snorkel if I need to do any water crossings.

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Originally Posted by Beejis60 View Post
Excuse my ignorance, but what is the benefit of this? Solely as your engine air supply?
The benefit is that if I need to ford a stream, my engine's intake is now inside the vehicle where it (should) stay nice and dry. If everything goes sideways, I'll have eyes on the water line (which would have to be in the cab) in relation to the level of the intake. If water is up to my window cranks, I need to shut 'er down and reevaluate my decisions. It also provides a little more insulation from dust and whatnot (although these trucks stock do not have a cabin air filter- that's also on the to-do list), but water ingestion prevention was the primary catalyst for this project.

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Originally Posted by Brake Weight View Post
Climate controlled CAI...?
Yep. 120 outside and I (should) be able to have a cool 80 air supply to the engine. Although, in the winter it'll be the other way around. One of the posts I read in preparation for my own install actually talked about that in depth almost as if intake temperature was a motivating factor for going ahead with the install.

It's always a work in progress...

Build thread: http://www.ttora.com/forum/showthread.php?t=143519
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post #6 of 10 (permalink) Old 04-06-2017, 10:45 PM
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Let's hope it never backfires.
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post #7 of 10 (permalink) Old 04-07-2017, 01:38 PM
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Quote:
Originally Posted by fnl4rw29r View Post
The benefit is that if I need to ford a stream, my engine's intake is now inside the vehicle where it (should) stay nice and dry. If everything goes sideways, I'll have eyes on the water line (which would have to be in the cab) in relation to the level of the intake. If water is up to my window cranks, I need to shut 'er down and reevaluate my decisions. It also provides a little more insulation from dust and whatnot (although these trucks stock do not have a cabin air filter- that's also on the to-do list), but water ingestion prevention was the primary catalyst for this project.
Come on now...

I lived in AZ for 12 years; ain't no water there
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post #8 of 10 (permalink) Old 04-07-2017, 03:06 PM
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Quote:
Originally Posted by Beejis60 View Post
Excuse my ignorance, but what is the benefit of this? Solely as your engine air supply?
You're better off getting a safari snorkel and doing it right. Who wants all that noise in the cab anyway?
It's not hard to do, just take a deep breath and cut that big hole in your fender and the rest is easy. Costs about 400 bucks and you get to answer a lot of silly questions. I tell them it's for blowing bubbles.
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I admit to being Crazy but I'm not Stupid
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post #9 of 10 (permalink) Old 04-08-2017, 09:58 AM
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You're better off getting a safari snorkel and doing it right. Who wants all that noise in the cab anyway?
It's not hard to do, just take a deep breath and cut that big hole in your fender and the rest is easy. Costs about 400 bucks and you get to answer a lot of silly questions. I tell them it's for blowing bubbles.
Plus lets be honest....

McDonalds wrappers sucked into the intake will do more harm than good.
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post #10 of 10 (permalink) Old 04-09-2017, 11:47 PM Thread Starter
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Come on now...

I lived in AZ for 12 years; ain't no water there
It was the Verde River that made me do it.

It's always a work in progress...

Build thread: http://www.ttora.com/forum/showthread.php?t=143519
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