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General Info Pros and cons of different makes and models (incl. international)

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Old 29-09-19
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Default Where is the snorkel?

Was browsing the superhighway and this picture had me stumped. I just could not spot the snorkel. Maybe a special breathing mod that is mounted on elsewhere not visible in the pic? If truly this 4x4 does not have a snorkel, then I think the driver is very brave indeed. I have only been to easy 4x4ing so have no experience in water crossing.
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Old 29-09-19
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It could have a water bra fitted. As it would assist in creating a bow wave that would reduce the amount of water ingress into the engine bay. Disconnected the fan and plenty of crc spray. Still a risky venture. On my older triton ( 1998) model I had a pod air filter mounted in the engine bay that was higher than the air inlet. I would only do a water crossing as a last resort under those circumstances. I had a Nissan patrol with all the correct gear snorkel diff breathers etc. did a water crossing in the Bungle Bungles and still damaged the fan blades. Thank god for RACWA plus road side assistance while the car was being repaired they paid for a car hire and a weeks accommodation in Broome.
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Old 29-09-19
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Most of that just looks like splashing from entry it seems. Maybe a little fast creating it to splash up rather than form a wave but the main water level seems not excessively deep; maybe wheel height. (Deeper than I want to go thru that kinda crud though!!)

I’ve taken my Pajs through water without a snorkel- but known beforehand to be well below intake height.

Water bra/blind also helps create a wave out the front. Don’t see one in the original pic though.
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Old 29-09-19
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Default Snorkel

Hi
Remember that your air box would have to fill up and the water trap would have to fill up before any water enters the engine. If your in and out fairly quickly you would be surprised how deep you can go. See attached prior to fitting my snorkel.
Dan
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Old 29-09-19
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Having a snorkel does not make your 4wd into an invincible water crossing machine!

The sellers of snorkels have been pedalling this myth for years and it is seen by many as the must have accessory, that is necessary for water crossings.

Myth 1: Snorkels are water tight, wrong.
Most aftermarket and factory fit snorkels are not water tight, they leak at the joints!

Myth 2 : Snorkels give you more power due the Ram Air effect so power is boosted.
This is only slightly true on a normally aspirated engine, on a turbo charged engine a snorkel adds no extra power.

Myth 3 : A snorkel gives your engine cleaner air.
This is only true is the factory air inlet is located in the inner wheel arch like the Pajero Sport and MQ onwards Triton. The forward facing air intake on the Gen 3 & Gen 4 Pajero, PC/PC Challenger and pre MQ Trition is located behind the front bonnet lip and bonnet seal, so the air intake is only about 600mm lower than a snorkel, the air cleanliness is about the same!
However fitting a cyclonic pre cleaner to a snorkel will remove larger particles and extend the life of your air filter. The air filter is what gives your engine clean air!
If you want to extend the life of your air filter, do not drive continuosly in people's dust!
Driving in close convoy formation may make for good photos and video footage, it is what we are all exposed to through all media sources.
I prefer to be able to see the road/track ahead and the scenery, and not be driving in dust and smelling exhaust fumes!

4wds regularly die in water crossings, some are fitted with snorkels and some are not. Most common cause is the drowning of the electrics and electronics in the cabin area. This occurs when the water comes up over the bonnet and enters the cabin via the fresh air inlets at the base of the windscreen. This creates a waterfall down the back of the dash an onto critical electrical and electronic components. The under bonnet electrical and electronics are splash proof but not immersion proof.

Fitting a water blind will create an air void in the engine bay and this is enough air for the engine to continue to run for a short time with a forward facing air inlet. A blind also prevents water from being forced through the air channels of the heat exchangers (radiator, AC condensor, intercooler and ATF cooler). This is particularly important if the water is dirty, as dirty water is forced through the air channels it leaves a slit deposit and this quickly build up, restricting the airflow through the heat exchangers and this will cause over heating. Best also to tie up the viscous fan blades so they do not move during the water crossing.

Modern 4wds are well sealed and an empty 4wd can start to float in as little as 300mm to 400mm of water, this is why driving through flowing water is particularly dangerous, once you are floating you lose traction and the ability to stay on a desired course.
Various studies in Australia have documented this.
https://www.abc.net.au/news/2016-06-...waters/7522798
http://www.wrl.unsw.edu.au/sites/wrl...lood-Flows.pdf

Also need to consider extended breathers for diffs, gearboxes and transfer case as water can easily enter these components during wate crossings.

A correctly fitted blind and correct driving technique will give you the best chance of getting through a long deep water crossing. A fully sealed snorkel will give you some extra insurance but it is not the "one thing" that enables you to just go charging into deep water without proper thought and preparation.

OJ.
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Last edited by old Jack; 29-09-19 at 06:46 PM.
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Old 29-09-19
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Great info OJ.
Is there any way to test that the air getting to the air filter is coming from the snorkel "mouth" as intended, or just through bad joints and poor seals ??
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Old 29-09-19
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Just stick a plastic bag over the top of the snorkel engine stops snorkel sealed.
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Old 29-09-19
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Another great post, OJ.


I'll add one more to your list:


Myth 4: The airbox needs to fill before you do damage to your engine.


Not true. I destroyed a V6 in my old MK Triton with just water flicked up by the fan towards the (unsnorkelled) air intake. Bent conrods, valves and destroyed bearings amongst other things. Looking in the airbox you would have trouble knowing that there had been any water in there at all. Bottom line? It doesn't take much.


The water was not deep, only up to about the bottom of the bullbar, but I lost traction and didn't have the sense to turn the engine off.
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Old 30-09-19
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Quote:
Originally Posted by NFT5 View Post
Another great post, OJ.

I'll add one more to your list:

Myth 4: The airbox needs to fill before you do damage to your engine.

Not true. I destroyed a V6 in my old MK Triton with just water flicked up by the fan towards the (unsnorkelled) air intake. Bent conrods, valves and destroyed bearings amongst other things. Looking in the airbox you would have trouble knowing that there had been any water in there at all. Bottom line? It doesn't take much.

The water was not deep, only up to about the bottom of the bullbar, but I lost traction and didn't have the sense to turn the engine off.
Correct, it doesn't take a lot of water to damage an engine because water is not compressible.
A recent post of what happened to a Challenger that was fitted with a snorkel.
See post 23 and 24 for the summary.
https://www2.pajeroclub.com.au/forum...ad.php?t=64790

Another thread worth having a read of;
https://4x4earth.com/forum/index.php...t.33512/page-2
OJ.
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Last edited by old Jack; 30-09-19 at 02:36 AM.
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