Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: PtP on November 10, 2008, 10:31:06 PM

Title: Snorkel and rain in the air-box
Post by: PtP on November 10, 2008, 10:31:06 PM
About a week or so ago we had a lot of rain which was blowing from the north and it appears that quite a lot of it blew into the snorkel on my TJ where it’s usually parked.

I recall starting the Jeep a week back and hearing a strange bubbling noise coming from the snorkel, but thought nothing more of it as I assumed it would soon evaporate off – WRONG!

On Saturday evening I took the Jeep out and whilst it would run fine at normal pottering speeds, I noticed it was just not wanting to rev. I looked inside the air-box today and discovered the stock filter was sodden wet and the bottom of the air-box was full of water! :-?

I’ve dried out the air-box and I’ll unplug the holes and fit a new filter in the morning. :-)

Anyone else with a snorkel plugged the drain holes in their air-box?
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Post by: MOCAJ on November 10, 2008, 10:34:49 PM
yep,plugged holes and K&N filters fitted

just dry out the box and re-treat the filters
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Post by: Bishops Finger on November 10, 2008, 10:38:46 PM
And park it at a different angle Pete...
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Post by: isle of man on November 10, 2008, 10:39:26 PM
In what direction is the snout pointed?
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Post by: scrw on November 10, 2008, 10:41:28 PM
:roll:
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Post by: Bishops Finger on November 10, 2008, 10:42:22 PM
Why ya never go off road.... :lol:
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Post by: scrw on November 10, 2008, 10:44:11 PM
...not with you anyway  :lol:
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Post by: MOCAJ on November 10, 2008, 11:08:57 PM
so pete has to turn his snorkle round to face the back of the truck

as it was parked, what happens if the rain comes from the south

sorry guys, not convinced  :-?
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Post by: Nosebolt on November 10, 2008, 11:12:33 PM
could go back to basics, a carrier bag and elastic band maybe?  :idea:
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Post by: isle of man on November 11, 2008, 03:59:00 AM
it's the driven (when your driving) rain that collects in the air box - also when off roading the snout facing forward will get clogged up with mud...i
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Post by: gazjeep on November 11, 2008, 07:10:55 AM
So then, are we saying its best to have it pointed backwards all of the time then  :?:
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Post by: scrw on November 11, 2008, 09:01:08 AM
Best facing backwards, stuff doesn't get forced down it when you are travelling forwards then
Title: u bend
Post by: xr6jeeper on November 11, 2008, 09:17:13 AM
Surely the way to solve this problem is to put an upside down u bend on the top. Just my ten penneth. :-)
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Post by: scrw on November 11, 2008, 09:18:29 AM
or a mushroom prefilter
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Post by: xr6jeeper on November 11, 2008, 09:26:43 AM
Or a u bend before and lower than the filter with a drain tube linked to an old washer pump motor,  :-) ,
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Post by: gordy on November 11, 2008, 12:47:50 PM
Slightly off topic guy's, apart from Australia, anyone know who retails snorkels for the diesel cherokee, or happens to know if one can be adapted/modified from one that is designed for another vehicle such as a landy?.
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Post by: eastryjeep on November 11, 2008, 12:56:42 PM
Oh come on!
Modified 3 litre milk bottle for parked condition:
AND
Big air box, short length of chain and commode built into passenger seat for use off road!
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Post by: Panic mechanic! on November 11, 2008, 01:05:07 PM
not having one but here's my input anyway.....
a snorkel comes with a filter in the snout so that any debris is filtered before it gets to the main filter,well I thought thats the logic behind the system.if you  turn the snout round then you are drawing air from a negative pressure zone ( caused by the snorkel travelling) hence you limit the supply cool air entering the engine,I can understand the idea of turning it round off road so as to stop branches, bubba's pork pies etc getting stuffed into it and damaging the pre-filter but otherwise i would not see their is any real difference in how it works.
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Post by: JamesH on November 11, 2008, 01:37:06 PM
Quote from: "gordy"
Slightly off topic guy's, apart from Australia, anyone know who retails snorkels for the diesel cherokee, or happens to know if one can be adapted/modified from one that is designed for another vehicle such as a landy?.


http://www.4x4-snorkels.co.uk/p/449968/ ... -dfau.html (http://www.4x4-snorkels.co.uk/p/449968/snorkel-kit-jeep-cherokee-25-litre-diesel-to-nov03---freight-code-dfau.html)

 :-)
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Post by: PtP on November 11, 2008, 02:24:51 PM
The snorkel is facing forward, but it filled with water from the rain blowing from the north whilst the Jeep was parked up and not from being driven in the rain.

These snorkels do not have a pre-filter, just a plastic mesh which is more of a finishing trim then anything else.

There is space for water to collect in the bottom of the main tube as the feed into the engine bay is a couple of inches back up the main tube.

I don’t think it’s possible to turn the ram on top of the snorkel to face backwards as it looks like it would interfere with door top.

If I recall, the mushroom pre-filters are only suitable for dusty low speed conditions.

I’m thinking if I open the two drain holes up, then whilst they are only about 3mm in diameter, this defeats the whole object of fitting a snorkel in the first place.

Apart from MOCAJ does anyone else block off the drain holes in the stock filter box?

I’ve just ordered a K&N filter as the local dealer wanted around £18 for a stock paper one and at £40 for the K&N I reckon this will be easy to service etc.
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Post by: wazza on November 11, 2008, 07:33:51 PM
yep ive sealed every joint an hole, not had your problem befor tho!

if you don't seal it then your snorkels just an expensive coat hook!!! an kiss your engine goodbye :smt039
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Post by: MOCAJ on November 11, 2008, 07:44:49 PM
Quote from: "wazza"
yep ive sealed every joint an hole, not had your problem befor tho!

if you don't seal it then your snorkels just an expensive coat hook!!! an kiss your engine goodbye :imwitstupid:
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Post by: isle of man on November 11, 2008, 09:16:26 PM
Yes seal every hole also.


Jezus "forced air induction" science of the god's I say.

Those who have not blocked the snout with crud - learn from those who have.


K&N the best filter by far for the mooooolar.



All the above is free advice - BUT MUCH TO LEARN ONE HAS (in my best Yoda voice)
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Post by: Bishops Finger on November 11, 2008, 09:29:32 PM
K&N's rock like barstewards... :lol:


Not a fan of em and not for historical reasons.... :shock:
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Post by: greggmo on November 11, 2008, 10:24:23 PM
the snorkel top should always face in the direction af travel as the manufacturer intended. the top is designed so that the wind driven rain and water hits the tube and is sent out through the vents on the top section of the snorkel. if you put it on backwards it will draw water rather than get it forced in by the rate of travel so it will just get sucked down the tube rather than hit the back of the tube. when did ya last check the airbox peter? maybe someone has just had some fun with a watering can :lol:
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Post by: Jeepthang on November 11, 2008, 10:40:49 PM
I've got an ARB on my XJ and have left the holes open. They are small enough not to pour water into your air box. Letting water in, they leak very slowly and would take some time for the airbox to fill the whole way to the air filter. Most river/water obstacles are relatively short and the idea is to get in and get out quickly and not to spend hours in the water.

I've had a very small amount of water in my airbox following a thunderstorm and found those holes drain the water away slowly. Pete must have had a monsoon hitting the mouth of his snorkel over a couple of hours to allow the airbox to fill up to the exent that the air filter was wet (unless airboxes on a TJ are a lot shallower than the XJ airbox)

I wouldn't swing the "ram" around to face backwards as that would just look stoooopid! But I have got an alloy aftermarket grill on mine as the plastic grills supplied seem to get ripped off easily by branches.

Oh yes and K&N 110%
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Post by: PtP on November 12, 2008, 11:50:36 AM
Thanks for all the input. I’ve concluded that the best thing to do is leave the holes in the air-box plugged up and just fit the K&N. This will keep the system sealed and if any rain does find its way in there again, then the K&N should not get sodden like the standard paper filter.
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Post by: BK on November 12, 2008, 12:52:45 PM
what about using this aswell?

http://cgi.ebay.co.uk/Unifilter-Snorkel ... m153.l1262 (http://cgi.ebay.co.uk/Unifilter-Snorkel-Pre-Cleaners-Ram-Head-Cover_W0QQitemZ360106385645QQihZ023QQcategoryZ161410QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262)
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Post by: PtP on November 12, 2008, 08:06:07 PM
It's an interesting idea, but I dont think it would last too long whilst out laning. :-)
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Post by: PtP on November 17, 2008, 11:39:48 AM
Just a quick update. :-?

The engine revs much more freely and it feels like it’s got quite a lot of extra power than before. :-D

After all the rain we had yesterday driving up the M6 on the way to the South Peaks, I thought I’d check the inside of the airbox. Whilst it had stopped raining by the time we arrived I had still driven for around 1½ hours in the rain and it is bone dry in there now. I presume any rain which did fine its way in there would soon evaporate off with the volume of air going through it.