Stockings on snorkels restricting air flow?

[AB]

I've noticed there are a few members who have stockings at the end of the snorkel.

Does anyone notice any restrictions with this at all?

I just need to put a temporary stocking over the snorkel to help stop water and mud flying in the hole until I get some decent flares, etc....

Trying to conjoire up other ideas to stop this in the meantime as well!

[Silver]

stockings with or without leg :-)

04OFF has a foam prefilter on his snorkel

[AB]

Without the leg thanks mate...lol

I was wondering if I could somehow utilize the existing pre filter taken out to mount on the roof but two problems with that...

1) Uglier then a bucket full of....
2) Would most likely be too restrictive

[Silver]

04OFFs has a unifilter brand on it

[04OFF]

04OFFs has a unifilter brand on it

Correct, cost about $25, i use mine dry (no oil) just wash with water to clean, never notice any performance loss, in fact its still on the car after Scenic Rim, (havent cleaned it yet) and i was in a lot of dust there.

As for fuel economy, mines a 4.5L ,so its bad anyway ! :o

[Silver]

can you turn the snout backwards AB?

You still see some of those Donaldson (I think??) pre filters on top of snorkels. All helps I guess

[BillsGU]

AB - I have a unifilter "Beanie" style pre filter. I did have the unifilter "Internal" type of pre filter - but it wore holes in it too quickly due to it flapping about inside the snorkel due to the air flow. Before that I had a small squre of shade cloth over the inlet. We get a lot of bugs and hoppers here in the country. The beanie style seems to do the job really well.

The only time I have turned the snokel backwards was when it was snowing quite hard and the snow started to build up on the inlet of the snorkel.

[rkinsey]

[QUOTE=The bad part about it is when I have to go and buy a pair of stockings! Can be embarrassing but you could just get your missus to buy them and bobs yr uncle![/QUOTE]

Dont be embarrased... Stokings are great boot polishing rags as well as buffing rags for the car. Afrter buffing the wax off of the paint work it will look nice and clean, but just stretch a couple of layers of stocking over a hand full of clean rags and watch the shine really come up on the car!

Using ones I buy at the store just saves me from getting in to more strife from the "Trouble and Strife"!!

Cheers,

Rob

[Bigrig]

I wear em!! Wouldn't dream of putting them on Tank though ... seems kinda 'girly'!!! lmao

Whatever works quite frankly!

[AB]

Thanks everyone, will look into it properly this weekend!

[Dirty Driver]

Folks, the experiences I've with air intake systems (mostly on larger trucks, but the principles are the same) is that stockings or any other form of pre-cleaner will increase the level of restriction in air flow to the engine. What does this mean to the fuel economy; the engine has to work a little harder to maintain the amount of air required to feed the beast. Turbos will run a little hotter which reduces their efficiency as the air is hotter entering the manifold. Thinner air means more fuel.
In short, stockings are fine to short term situations (IMO). The best designs I've seen are a forward facing snorkel that has a larger hole located at the back of the snorkel right down the bottom. We used these extensively as they allowed the larger dust particles, water and some debris to hit the back snorkel wall and drop out this outlet. The other design is the one released by Nissan on the GQ series, where the snorkel runs up the L/H A Pillar and extends over the front passenger's door. These have openings down the sides and have proven to give good results in the reduction of large foreign particles entering the intake system. We tested these in extreme dust and heat conditions with good results.
The other thing you need to watch with stockings (particularly on turbo engines) is that the stocking does not deteriorate and then get sucked into the intake system. They do make a mess of turbos and intake manifolds.
Happy travels...

[YNOT]

Folks, the experiences I've with air intake systems (mostly on larger trucks, but the principles are the same) is that stockings or any other form of pre-cleaner will increase the level of restriction in air flow to the engine. What does this mean to the fuel economy; the engine has to work a little harder to maintain the amount of air required to feed the beast. Turbos will run a little hotter which reduces their efficiency as the air is hotter entering the manifold. Thinner air means more fuel.
In short, stockings are fine to short term situations (IMO). The best designs I've seen are a forward facing snorkel that has a larger hole located at the back of the snorkel right down the bottom. We used these extensively as they allowed the larger dust particles, water and some debris to hit the back snorkel wall and drop out this outlet. The other design is the one released by Nissan on the GQ series, where the snorkel runs up the L/H A Pillar and extends over the front passenger's door. These have openings down the sides and have proven to give good results in the reduction of large foreign particles entering the intake system. We tested these in extreme dust and heat conditions with good results.
The other thing you need to watch with stockings (particularly on turbo engines) is that the stocking does not deteriorate and then get sucked into the intake system. They do make a mess of turbos and intake manifolds.Happy travels...

I think they were actually refering to the stocking as a pre-filter only, to work in addition to the original air filter which would catch any material that may breakaway from a deteriorating sock before it gets to the intake system.

Tony

[nowoolies]

i`ve just about given up with the fuel consumption on my bus so the uni filter i use gets used off road all the time.
only put it in the top of the snorkle when we go bush though, and so far have`nt noticed a differance in fuel consumption
did find one stuck just in front of the main air filter though ,got sucked all the way through,it was a mongrel to get out.

[04OFF]

Using the uni pre-filter will not stop your intake getting restricted due to clogging of dust etc, it will probly cause a restriction sooner, due to the fact it is smaller in surface area than the main filter, and is also directly exposed to the enviroment.

The main reason i use the pre-filter, is to make the restriction/dust collect at the top of the snorkel, thus making it easy to remove, clean and replace, all with little cost and fuss compared to changing/cleaning the main engine filter.



I only use my pre-filter when im in dusty conditions and or in convoy, but once on, i normally leave it on until i get round to washing the car.

[Dirty Driver]

I think they were actually refering to the stocking as a pre-filter only, to work in addition to the original air filter which would catch any material that may breakaway from a deteriorating sock before it gets to the intake system.

Tony


Yep that's a fair call Tony.

DD

[GQ4.2]

mate of mine just used a bit of offcut foam from clarke rubber and zip ties it around his stainless snorkel

[taslucas]

I reckon that restriction of airflow from a stocking would be absolutely minimal. Hold it against your mouth and breathe through it, theres really no restriction at all. The difference between using a 3 inch snorkel to a 4 inch snorkel would probably be greater.
What about using fly screen mesh and a cable tie? A bit ugly and wouldnt stop any dust but good for bugs/sticks etc.
I saw a guy go through a rough creek crossing on the beach, he went a bit fast and good splash of water went up the windscreen and straight down the snorkel. Turning the snorkel around would help that.

[taslucas]

what about a fish net stocking???? lol

[twisty]

Turning the snorkel around would help that.

This seems to be the simplest solution imo.

I don't yet have a snorkel and it's top of my wish list. My concern is with the front facing inlet and the debris it must collect, regardless of conditions. I'm also unconvinced of the ram air value in performance. Surely having the inlet facing backward all the time would be prefered. An internal pre-filter accessable by removing the inlet sounds sensible too. And it would look better than a fishbowl ;-)

Am i missing something?

[twisty]

The Donaldson (fishbowl as you call it) snorkel are brilliant for separating dirt and dust out of the air before it goes down to the airbox.

...most filters except perhaps a K&N filter (which I don't think are any good for 4x4ing by the way).

Thanks Plasnart, snow is always a posibility here ;-)

I'll have a look for a Donaldson :-)

Why not K&N? -edit- understood -edit

[growler2058]

Thanks Plasnart, snow is always a posibility here ;-)

I'll have a look for a Donaldson :-)

Why not K&N?

Have a look here mate i rekon this thread has some info http://www.nissanpatrol.com.au/forums/showthread.php?4112-K-amp-N-Air-Filter-in-a-3L-05-GUIV-(NON-CRD)&highlight=filters