snorkel

[steve61 Member Find all posts View Profile Close steve61]

Could anyone answer this question?
I have seen a few 4wds with the intake of the snorkel facing the rear instead of forward anyone know why?

Cheers
Steve

[lc120_man Advanced Member Find all posts View Profile Close lc120_man]

Re: snorkel

If it rains heavy you can turn the snorkel head around to prevent water getting into the air filter.
Some also do it in very dusty conditions...

[FlyingBushPig Advanced Member Find all posts View Profile Close FlyingBushPig]

Re: snorkel

You will also find this more on gas converted vehicles.
Apparently gas likes consistent intake rather than varying gusts which petrol & diesels like, so by facing it backwards it still has to suck the air in rather than having a ram-air effect.
Not sure if this is true or just an old wives husbands tale My old boss does this on his gas converted troopy and reckons he gets better response, economy and less problems :? :?: :?:

[lc120_man Advanced Member Find all posts View Profile Close lc120_man]

Re: snorkel

This definitelly does not apply to Prado with Sequential Viper Injection System. Never had to do anything to snorkel to make it run better...

You will also find this more on gas converted vehicles.
Apparently gas likes consistent intake rather than varying gusts which petrol & diesels like, so by facing it backwards it still has to suck the air in rather than having a ram-air effect.
Not sure if this is true or just an old wives husbands tale My old boss does this on his gas converted troopy and reckons he gets better response, economy and less problems :? :?: :?:

[Prado BB Advanced Member Find all posts View Profile Close Prado BB]

Re: snorkel

If it rains heavy you can turn the snorkel head around to prevent water getting into the air filter.
Some also do it in very dusty conditions...

I would agree, moreso in dusty conditions or when in convoy. It prevents fine dust getting through the filter and damaging the engine. It also enables longer filter life. Its also a good idea if playing in puddles, as it prevents waves of water being accidently sucked through the snorkel. Alternatively you can buy socks that fit over the head, however I find these cannot be used on the road/highway as they restrict flow, increase fuel consumption and loss of power.

Cheers, Andy

[steve61 Member Find all posts View Profile Close steve61]

Re: snorkel

So if I am reading these replys correctly I should turn the intake around when we are travelling the Great Central Road to the GTG??

[Prado BB Advanced Member Find all posts View Profile Close Prado BB]

Re: snorkel

So if I am reading these replys correctly I should turn the intake around when we are travelling the Great Central Road to the GTG??

steve61, yes I would suggest that it would be a good idea when the conditions deteriorate especially if you are following someone on a dirt road.
Cheers, Andy

[mumstruk Member Find all posts View Profile Close mumstruk]

Re: snorkel

I remember seeing something on TV, might have been Top Gear or Long Way Round. Guys were driving though a sandstorm and one of the fourbys came to a complete stop. The boys emptied a ton of sand out of the air box, turned the snorkel around so it faced backwards, problem solved. I remember it being a Safari Snorkel. You do get a significant 'ram air' effect with it pointing in the right direction.

[Bushbasher Out of control poster! Find all posts View Profile Close Bushbasher]

Re: snorkel

Turning the snorkel around cannot reduce the dust intake, the engine is drawing in air via the snorkel opening and the dust is suspended in the air therefore the dust will travel down the pipe whether it is facing forwards, backwards or sidewards. The solution when travelling along those dusty roads in convoy is to increase your spacing between cars. You will need to clean the filter more often or replace it earlier than you would if driving on bitumen. I used to own a car with a rear facing bonnet scoop a la phase five V8 Falcon. When driven in rain you could see the water being drawn into the scoop and it would dump onto the top of the manifold. It's simple physics and involves the air pressure differentials between the bottom of the windshield and that rushing underneath the car.

[D4D Addicted PP Member Find all posts View Profile Close D4D]

Re: snorkel

I use a Unifilter Snorkel Ram Head Cover http://www.uniflow.com.au/index.html?la ... et=d2.html

[Spurio Senior Member Find all posts View Profile Close Spurio]

Re: snorkel

Turning the snorkel around cannot reduce the dust intake, the engine is drawing in air via the snorkel opening and the dust is suspended in the air therefore the dust will travel down the pipe whether it is facing forwards, backwards or sidewards. The solution when travelling along those dusty roads in convoy is to increase your spacing between cars. You will need to clean the filter more often or replace it earlier than you would if driving on bitumen. I used to own a car with a rear facing bonnet scoop a la phase five V8 Falcon. When driven in rain you could see the water being drawn into the scoop and it would dump onto the top of the manifold. It's simple physics and involves the air pressure differentials between the bottom of the windshield and that rushing underneath the car.

EXACTLY !!!!

[Signature035 Advanced Member Find all posts View Profile Close Signature035]

Re: snorkel

D4D,

.....also be verty careful of any form of pre-oiled filter in very dusty conditions, they tend to block very quickly.
Agreed they filter more throughly, but bull dust will completely block an oiled pre filter in a couple of hours driving

[mav Addicted PP Member Find all posts View Profile Close mav]

Re: snorkel

I would suggest anyone coming to the GTG to have a good look at extra filtering as there will be significant dust created by the teams in convoy. The Mereenie Loop Rd will be the test for sure as will going out to Ruby Gap and Arltunga. I am going to get a few Unifilters I will probably get a pack of 3 internal plus a RAM head filter

[Scotty56 Lurker Find all posts View Profile Close Scotty56]

Re: snorkel

Disagree a little bit about some of the views expressed re-the turning of the snorkel backwards.

Dust/dirt has mass or weight and it won't change direction as quickly as air, infact this is the principle of many air cleaners, they spin the air which causes the heavy dust to be thrown outwards allowing cleaner air to pass through the filter.

Now if we turn the snorkel backwards and the vehicle is travelling along in dusty conditions the dusty air has to change direction 180 deg, the heavier particles of dirt in the air will not have enough time to change direction so will bypass by the inlet. It won't stop the dust it just reduces the volume of it entering the system.

Now if the snorkel is facing forwards the dusty air is forced directly into the snorkel which of course means into the air filter housing.

This is simple physics.

Kim

[Prado BB Advanced Member Find all posts View Profile Close Prado BB]

Re: snorkel

Disagree a little bit about some of the views expressed re-the turning of the snorkel backwards.

Dust/dirt has mass or weight and it won't change direction as quickly as air, infact this is the principle of many air cleaners, they spin the air which causes the heavy dust to be thrown outwards allowing cleaner air to pass through the filter.

Now if we turn the snorkel backwards and the vehicle is travelling along in dusty conditions the dusty air has to change direction 180 deg, the heavier particles of dirt in the air will not have enough time to change direction so will bypass by the inlet. It won't stop the dust it just reduces the volume of it entering the system.

Now if the snorkel is facing forwards the dusty air is forced directly into the snorkel which of course means into the air filter housing.

This is simple physics.

Kim

Agreed. I have experienced the difference when in convoy. The filter remains much cleaner if turned backwards.
Cheers, Andy