How to Pressurise your Camper

Submitted: Saturday, Nov 08, 2014 at 16:56
ThreadID: 110085 Views:7516 Replies:8 FollowUps:16
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Done and proven for all those that are interested in doing it.

No dust!

Very clever and simple

http://www.youtube.com/watch?v=zzM_Lq9Lp10&list=UUV2K7cUPz2ImuHRcTaKK7aA

Cheers.
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Reply By: Bigfish - Saturday, Nov 08, 2014 at 21:51

Saturday, Nov 08, 2014 at 21:51
Certainly worked ok.
AnswerID: 541440

Reply By: Sigmund - Sunday, Nov 09, 2014 at 07:42

Sunday, Nov 09, 2014 at 07:42
Clever.

How much due to the ram air and how much due to the seals, can you say?
AnswerID: 541446

Reply By: Member - Will 76 Series - Sunday, Nov 09, 2014 at 07:51

Sunday, Nov 09, 2014 at 07:51
That is impressive. Even more impressive you dragged the van across the Simpson. I was concerned about water making its way thru the Snorkell into the van but that didn't seem to be a problem.
Interesting.
AnswerID: 541447

Reply By: Erad - Sunday, Nov 09, 2014 at 08:48

Sunday, Nov 09, 2014 at 08:48
Looking at the snorkel head, it seems to be pointing towards the rear of the van. I expected it would point forward. Otherwise, well done Crusier.

On my Jayco Poptop, I have a standard little scoop which pops up. We put a bit of Aircon filter in the opening to try to stop insects etc getting in. We also put a piece of rubber carpet underlay in the door vent, between the flyscreen door and the main door frame. This blocks up the hole, and helps to pressurise the van. We travelled from Nocundra to Tiboorburra, and at times we couldn't even see the van in our mirrors, such was the dust. There was virtually zero dust inside the van, only a little under one of the beds at the rear corner.

A very simple way to dustproof your van, but you must remember to take out the foam when you stop, because the lower door vent is the excape for any LPG leakage inside the van.
AnswerID: 541448

Follow Up By: Life Member-Doug T NSW - Sunday, Nov 09, 2014 at 09:56

Sunday, Nov 09, 2014 at 09:56
If the snorkel was pointing toward the rear then it would be totally useless, it would have to point forward as does the ones for the engine air intake.

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Follow Up By: Bigfish - Sunday, Nov 09, 2014 at 11:05

Sunday, Nov 09, 2014 at 11:05
To get the necessary pressure it would have to face forward. Vehicle snorkels can face forward or backwards as proven many times. The engine sucks air in. The van , with the intake facing rearwards would have no forced induction and become full of dust. If indeed the intake is facing rearward, I would like to know how it works!!
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Follow Up By: Allan B (Member, SunCoast) - Sunday, Nov 09, 2014 at 16:39

Sunday, Nov 09, 2014 at 16:39
Indeed in this clip from the video, the intake appears to face rearward.
Bang goes another law of physics.

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Follow Up By: Ron N - Sunday, Nov 09, 2014 at 20:09

Sunday, Nov 09, 2014 at 20:09
I reckon all you blokes who think the snorkel face rearwards, need to go to Specsavers!
I've just purchased new glasses, and the snorkel sure looks like it's facing forwards, to me!

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Follow Up By: Life Member-Doug T NSW - Sunday, Nov 09, 2014 at 20:19

Sunday, Nov 09, 2014 at 20:19
Oh com'n Ron.. you just turned it...

Haa but it is the logical thing to have it facing forward, maybe the owner turned it when it Rained, or on sealed road.


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Follow Up By: Ron N - Sunday, Nov 09, 2014 at 20:34

Sunday, Nov 09, 2014 at 20:34
Doug, even in Allan's snapshot of the video, the snorkel still appears to be facing forwards to me. I don't see how it could work otherwise.

If the snorkel is reversed, you then have the venturi effect, which is the principle of how fuel is sucked from carburettor bowls.

Now ask me, "what's a carburettor?" LOL

Cheers, Ron.
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Follow Up By: Allan B (Member, SunCoast) - Sunday, Nov 09, 2014 at 21:49

Sunday, Nov 09, 2014 at 21:49
Sure enough Ron, in your screen grab the snorkel appears to be facing forward.
But take a look at this screen grab...........


The intake side is clearly red. Now look at my first grab above. The red is facing to the rear (note spare tyre on rear)

So is this bloke having a loan of us by a switcheroo?
Just which way was it during the field test?
Maybe it doesn't matter. Perhaps all the trouble he exercised in sealing the van did the trick on its own?

Speaking of red, I think I'll have another.
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Follow Up By: Ron N - Monday, Nov 10, 2014 at 11:55

Monday, Nov 10, 2014 at 11:55
Gee, Allan - This is making me see red!
Is this Jayco bloke laying out a red herring?
This argument about snorkel-direction-facing is like a red rag to a bull! LOL

Seriously - I'm not sure that this Jayco bloke is getting as much effect from his snorkel as he claims.
IMHO, he'd need to have the snorkel mounted quite a bit higher to get any real ram effect, as the height it's currently mounted at, suggests it's located in the wind vortex of the towing vehicle - which is regarded as a low pressure area.

I would agree that he's possibly getting more benefit from his duct tape sealing and door vent sealing with carpet underlay, than he's getting from his snorkel - particularly with filter screen material in it.

Here's a link to a snorkel seller who points out a lot of things that affect snorkels performance.

Air Ram performance

The Americans who sell the Ram Air Intake devices for improved engine induction, claim that there's negligible ram effect under 40 mph (64 kmh).
So on that basis, the snorkel is not going to have any major effect on pressure inside the Jayco 'van until somewhere near that same speed.

I can recall car manufacturers stating that a vacuum starts to be produced inside a vehicle once it starts to exceed 40kmh.
That's the reason why cars of today have air outlet vents with clack valves fitted to them, to exclude the dust that is drawn in by that vacuum which is created above 40 kmh.

Accordingly, you need to start creating positive pressure inside a vehicle (or 'van) at around 40 kmh to ensure that no dust enters.
To my mind, this can only be achieved by the installation of an electric fan blower setup which is operating at all times, or above 40 kmh - or by a very effective snorkel with a wide aperture, with no restrictions, that is mounted directly into a positive-pressure airstream flow.

Cheers, Ron.
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Follow Up By: Steve in Kakadu - Monday, Nov 10, 2014 at 12:58

Monday, Nov 10, 2014 at 12:58
If an aircon on medium can pressurise a Landcuiser wagon, I am sure this would be more than sufficient to pressurise a small camper.
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Follow Up By: Allan B (Member, SunCoast) - Monday, Nov 10, 2014 at 13:10

Monday, Nov 10, 2014 at 13:10
Would this work better Ron? LOL

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Follow Up By: Ron N - Monday, Nov 10, 2014 at 14:00

Monday, Nov 10, 2014 at 14:00
Allan, you surely must have something better to do, than fool around with Photoshop? LOL

Cheers, Ron.
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Follow Up By: Life Member-Doug T NSW - Monday, Nov 10, 2014 at 14:39

Monday, Nov 10, 2014 at 14:39
Looks like a Snake ready to strike.


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Follow Up By: Jarse - Monday, Nov 10, 2014 at 20:36

Monday, Nov 10, 2014 at 20:36
You won't get ram recovery in free air on a snorkel fitted to an engine until well over 160km/h (around 140mph, actually). Snorkel manufacturers won't tell you that.

When it's being used for the purpose of this thread I'd tend to believe the lower speed though. Less friction losses in the snorkel at that speed, and no intake suction to overcome :)
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Reply By: Member - mark D18 - Sunday, Nov 09, 2014 at 08:49

Sunday, Nov 09, 2014 at 08:49
Yes seems to work well
What about the thousand rattles out of the poor old Jayco.
What is with the continued use of camper trailers on the Simpson desert . It is very clear SA Parks don't want them on the desert.
Good old tent works really well !!
AnswerID: 541449

Follow Up By: Shaker - Sunday, Nov 09, 2014 at 21:11

Sunday, Nov 09, 2014 at 21:11
If they don't want them then they should ban them, until then people can do as they please,

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Follow Up By: Member - mark D18 - Monday, Nov 10, 2014 at 07:55

Monday, Nov 10, 2014 at 07:55
Shaker
Its a shame common sense is not so common !!!
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FollowupID: 827597

Follow Up By: AlbyNSW - Tuesday, Nov 11, 2014 at 06:25

Tuesday, Nov 11, 2014 at 06:25
He posted his trip prep on Lcool
Apart from the snorkel mod he removed all the external fixings and siliconed hole and put new fixings in
I thought the whole event would have ended in tears but proved me wrong anyway
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FollowupID: 827657

Reply By: Ron N - Sunday, Nov 09, 2014 at 15:26

Sunday, Nov 09, 2014 at 15:26
Well done, that man! One can do the same with a 12V motor and fan from a car heater - I've seen it done, but it involves more work, of course.
The advantage of a fan is that it still pressurises at low speed - whereas the snorkel would only start to pressurise at about 30kmh and above.

Cheers, Ron.
AnswerID: 541453

Reply By: BarryMcKenzie - Monday, Nov 10, 2014 at 01:03

Monday, Nov 10, 2014 at 01:03
I think this guy is just very good at sealing his Jayco. Can't see how the ram head works, facing to rear or forward....
Was that the first time since arriving home that he had pulled the filter material out? Would have expected at least a bit of fine dust in the pvc inlet plumbing....
There is no form of induction and I don't think the head and plumbing would work like a carby (venturi) or an eductor without some form of motive flow, even driving I don't think would be enough motive flow.....
AnswerID: 541481

Reply By: Russan - Monday, Nov 10, 2014 at 13:32

Monday, Nov 10, 2014 at 13:32
We done with the presurising of you van. It appears to have worked a treat.

I also notice that you have a stone stomper fitted. We have done a many thousands of km of unsealed roads towing our caravan and using a stone stomper as well as the common pressure hatch in the roof. The Stone Stomper stops a significant amount of dust and rocks coming up between the car and caravan.

We originally bought the stone stomper to stop stone damage to the front of our caravan but the amount of dust it also stops has been a great bonus.
AnswerID: 541501

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