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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