That totally incorrect. That would be fine...if you were driving slowly/rock crawling (but why would you need to then anyways).

Think about it. A forward facing snorkel essentially functions the same as a ram air hood on an engine. It forces air in. So what happens when you turn it around? It works like a cowl hood. The negative pressure zone created behind the air inlet will actually suck air AWAY from the snorkle and the engine at high speeds, basically starving the engine of air and completely defeating the purpose. This can cause severe damage to your engine over time.

Production snorkels either have a drain or a water check valve in them, or the hat has a water/air separation device to prevent water from entering the intake.

 

almost but a cowl hood uses the high pressure area at the bas of the windshield to force aair into the airbox

 

ah...bad comparison i guess. I didn't mean an induction hood, just a raised cowl (not with the end near the windshield low pressure zone), or louvered hood vents.

 

So turning a snorkel backwards is bad?

 

Turn it to the side!

 

 

even better, duct tape a t-shirt to it!

 

If I make a snorkle how hard would it be to make a cap for it

 

if you make your own raised snorkel I advise you buy a cap designed for that purpose with an air/water separator. There are other ways to do it (search around) but this is by far the most foolproof. You absolutely need to use big enough piping though...a mistake a lot of people make.





Another idea for you is how I did mine. I ran the intake pipe into the wiper cowl.

https://www.cherokeeforum.com/f2/my-...snorkle-67919/

 

Good point about the negative air pressure. I hadn't thought about that but I cant see that small surface area causing that much of a negative pressure area to starve the engine.

I'd leave it forward as I said before anyway.

 

dukie

I saw that link before, does any water get into the wiper cowl when its raining?

 

a little, but it drains out the cowl drain, never had any water get in. Even if some managed to get into the tube, it would fall to the bottom of the airbox and drain there.

 

Eventually I'd like to make a home made PVC snorkel, full out to my roof.

Dukie, what diameter PVC should I use? 2" was the plan, just curious what your thoughts are.

 

2" is too small, you can't suck enough air volume down that long length of pipe - you'll bog down the engine under WOT.

I went with 3" dia. for mine. The inside diameter is about the same as the stock tube.
2 1/2" dia. would probably be ok, but most snorkel caps are made for 3" tubing.

 

That is some seriously large tubing hanging off the side of my truck.

I guess thats why all the non-home made kits aren't round and bulky.