3rd Gen Cowl Induction Snorkel

The hvac system intake is lower in the cowl than the hole I made and I've yet to pull in water through that. If you're pulling in enough water to hydrolock through the cowl you've got bigger problems than a hydrolocked motor lol

 

I guess I need to look closer at how it sits inside. I’ve had a few water crossings with waves of water over the hood.

 

I've got mine butted up right against the top, with the drain on the side opened up to accommodate the new airflow requirements from the cowl. I believe this side of the cowl is closed off up top as well so it's not getting rained on directly

 

If water is getting above your hood, the OEM intake isn't exactly having a great time either

 

That’s not how water crossings work but none the less I have a traditional snorkel

 

I think he’s saying water will enter the stock intake at lower water levels before it gets to over the hood level. That’s where I’m at. I am getting water into my intake on minimal water crossings. I made my situation worse by putting a bumper on my truck and cutting the fender liner. I’m hoping the wiper cowl relocate will help me in my situation.

 

as long as you're pushing a good bow wave (light blue line), then it shouldn't be an issue as long as you keep your momentum up, doesn't really matter what sort of water crossing you do (unless you're perpendicular to the flow of water then that's another thing i'm not going to get into)



the moment you get hung up on something and you fall behind the bow wave (this is assuming standing water Dark blue line) then the OEM intake will start to sip water in, or chug it as.


As a refresher, the OEM intake is a 4" converging into a 3" pipe at the wheel well as seen here and has this little cup to try and reduce the amount of water it intakes:


Purple line would "drown" the OEM intake as it's lower down before water gets to the cowl intake (this is obviously assuming the air box is water tight and even the drain hole does not allow water, i'm talking surface level here)


when the water gets over the hood (teal)

Having the water over the hood (in the common folk's use case) is rare if not at all. as you (and myself but not to the extend of water over the hood) have done some water crossings, then yes. in theory with enough water over the hood from approching into a suddenly deep portion of water and then straightening out will result in the cowl cover to catch and direct water towards the cowl inlet. However that is usually only the case for a few seconds as the vehicle flattens out and the intial bow wave creation starts to form with the water flowing off the hood. I think it's a significant amount of water less entering to the air box than having the OEM intake, but still not as good as a proper snorkel.
But if you constantly have water to that extent, yeah we have issues else where if you wind yourself in a soft spot that deep.

 

Thats exactly right, you can ford pretty deeply well over the intake inlet as long as you have a good momentem.

I wasn't suggesting people submarine their trucks around, in my cases it's usually the truck falling into a deep hole or off a rock and a massive wave rolling over the hood and into the windshield even for just a couple seconds before climbing up and out.

Looking at the diagram I can see the cavity that would essentially fuction as a water separator which totally makes sense to me.

I dont know if it would abate the pucker factor if you fell in a hole but better than nothing.

Thank you for drawing that out.

 

@Shveet
In the 4th picture (stolen I now see) of your extensive write up you show the right-hand side of the cowl box. Would a three-inch hole be able to be placed there. This would put the hole somewhere into the fender well above the fender liner. I ask because I have a battery in the way of taking the direct route from the air box to the firewall. Don't worry about the method of getting through the cowl/fender; there is always a way, but I can see there is no room for a hole saw and drill motor in the cowl box. Also just where is the drain(s) for the cowl?

 

Not sure what the driver side looks like,
But this is the passenger side with the fender entirely removed.

If you look for the arrow (middle left of the image) there is already a 3"ish hole. Alternatively if you have the battery in the way, This guide might be the one for you to look at.
It's not as pretty and i'm not particularly a fan of where the person leaves the cowl side intake (too close to where water would flow for my taste) but it might be what you're looking for. (or i'm misunderstanding your question)

https://www.youtube.com/watch?v=ajfM6FBqs_8

 

You understood properly. That’s the idea I have, but in the case of the video most terribly executed. No seal against water at either end. Thanks for the link.

 

As others have noted, the stock intake is still a concern even with fender liners if you lose your bow wave. Looking at the photos of the fender removed, it would seem that if you keep your liner, you could potentially just extend the intake up to the top of the fender recess with an elbow and end up with the same freeboard as the cowel alternative. Anything I'm missing here?

 

It just comes to question of "how waterproof is it?"
If you can get a 4" hose and raise it 90 degrees up and into the fender well - then yes it'll work the same. Issue is, since the fender tapers, where do you put the inlet? There might not be room for a 4" hose that doesnt get compressed. A 3" maybe if you follow the video above.

 

Ok y’all. My plan didn’t work out exactly how I wanted, but still an improvement. The (2) 45 degree hose pieces didn’t fit together right. The good thing with hose is that it can be cut. Next I will try a coupling there in the center to attach the two together vs the flexible piece I have shoved in there. I feel like the air flow is better with these solid pieces vs the flex.

 

Couldn't rotate the bottom 45 a bit more and use a solid tube? Hard to tell from the angle of the photo

 

Not in my case. That damn ABS module is right in the way.

 

Modify or move it a bit. Look at it again, there is almost always a way. Of course my module is in the other side.

 

Shame, though with the ducting, could you not just remove the 2 45 bend silicone like others have done?

Actually, scrolling back, you already did that. what got you to change to the 2 45 bends? IMO that top bend might be worth trimming down a bit
similar to how i have mine: Just straight enough to keep a clamp on it.

(image was actually me fluffing about trying to build a new mount for my X20 winch controller that i had to re-relocate, will post stuff above it once i'm happy with it.)

But in yourcase, up against the firewall. It'll straighten out the system a bit and drag you away from the ABS

 

It’s a project that will have to wait unfortunately. I have a ride this Saturday that will definitely see water crossings so this was the best I came up with in that time.

 

nice! snap some before and after photos of the air box for kicks. Have fun