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  #1  
Unread 17th June 2018, 07:52 PM
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Default Snorkel: Air Ram or Pre Cleaner?

Which would be better for dust?
It seems pretty logical to me that the pre cleaner would be better than the air ram for dust assuming the air ram didn't have a sock.


Which is better in (heavy - when we get it it generally thumps down) rain

It also seems logical to me that the pre cleaner would be better than the air ram for rain ingress.


So.. if using a sock on the air ram, is there any noticeable restriction in air flow?

How often do they need cleaning in 'normal' use (i.e. not outback dust)?
How do you clean them?


Is anyone using/used a pre cleaner? Do you ever need to empty it in 'normal' use? Do yo still use it?



Thanks!
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Unread 17th June 2018, 08:51 PM
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I tried the oiled socks but they clogged up pretty quickly in the outback and needed cleaning daily. They may help if un-oiled. I think the cyclonic pre-cleaners would be good e.g. http://www.donaldsontoolbox.com.au/f...er-Oct2013.pdf
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Unread 17th June 2018, 11:58 PM
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Yeah, that's what I meant by pre cleaner. Thinking of getting one as I'm worried about the rain destroying the air filter
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Unread 18th June 2018, 12:00 AM
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Default air ram

I've been doing a bit of research on snorkels and the ram effect is next to negligible under 100Kph so it doesn't make too much difference whether the snorkel faces forwards or backwards.

The primary purpose of a snorkel is to prevent water ingress and some designs now incorporate a water trap with a drain valve where conditions are such that some water entry is inevitable.

The secondary purpose is to place the air intake in such a way as to minimise the amount of dust entering the intake. The higher the better though very fine dust is still going to be a problem and that's the kind that will block the air filter. This is a problem when travelling in convoy. After a day in a convoy of a dozen or so cars on dry dusty tracks recently, my relatively new air filter had to be vacuumed as a stop-gap measure. A rear-facing intake on a snorkel doesn't fix that problem either as a low pressure spot is created at the entrance to the snorkel and dust gets sucked in just as much as it would with an air ram.

There is no filter, apart from a cyclonic filter that will remove dust without clogging so I agree with Kevin. Apart from looking daggy and bulky, a cyclonic filter is the best option. There is always the option of using a sock and washing it out frequently.

You could take a cordless vacuum and vacuum the main air filter element every time you stop for a break.
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Unread 18th June 2018, 01:55 AM
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Quote:
Originally Posted by Beachworm View Post
You could take a cordless vacuum and vacuum the main air filter element every time you stop for a break.

This is what I do in the evenings Bang the filter on a tree trunk a few times then vacuum with a 18V Ryobi cordless hand vacuum.
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Unread 18th June 2018, 01:59 AM
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Default cyclonic filters

If you want a good, though biased explanation of cyclonic versus ram, see the following link http://www.4wdworld.com.au/Airflow-S...d-to-know.html
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Unread 29th June 2018, 04:05 AM
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There's a few issues there. And I felt the article didn't really explain anything in the end anyway... I'll admit I read it a few nights ago and can't be bothered reading it again. Anyway:

To have any true ram air effect the scoop would need to be a much larger diametre to create a decent high pressure event in the intake. It'd have to be something like 30cm sq to have any great effect.

Also scooping water during rain is a falicy if you've got a decent snorkel - mine is a safari unit and built into the scoop is several drains in the back of the scoop. The idea is the rain droplets can't change direction as quick as air due to their weight. These droplets then hit the back of the scoop of the snorkel then run out via the drains at the back of the scoop at the top of the snorkel. I've not had a wet filter in the heaviest of rain with only very little water in the bottom of the air box - that I don't worry about.

As for the cyclonic device - I'd probably only use it when needed and have the scoop on every other time. I've heard good things from a few people that have used them.

Cheers

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Unread 29th June 2018, 06:25 AM
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Cyclonics are absolutely awesome when you need them.


I was passenger in a 4wd in a Simpson desert sandstorm and the sand was literally raining out the bottom of it.


With a standard intake, you would have to stop and wait it out.


Whether you need to keep driving in such conditions is another matter.
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Unread 29th June 2018, 07:59 AM
Beachworm Beachworm is offline
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i'd love to know if anyone has put a snorkel on an SH Forester. Now that I've done my breather extensions both front and rear that should be my next project but I haven't been able to find anything on line that details how to fit one to the SH model. The shape of the front guard makes it unlikely that the Pajero unit used on the SG would fit. Is anyone able to share some ideas with me?
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Unread 29th June 2018, 03:42 PM
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that pajero unit fits my gen outback ?anyone know what people put on those outbacks?
and thats serious problem if that rain will come inside tube. i mean i dont wanna that happen. what about have air sucking hole looking away and not in front ? saw some people do that on some diy snorkels. i mean no rain problem and less dust as well.

i mean not this kind


but that

if that style works then should be no rain problems anymore is it ?
..unless you go backwards and rain goes inside still haha
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