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  #1  
Old April 15th, 2004, 11:24 AM
Kerr
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snorkel question

after looking though a lot of your alls photos, I noticed a lot of you have snorkels on the drives side and some have them on the passanger side. Is there a reason for this. It also looks like some are "ARB" and other look to be factory.

Anyone care to explane this to me.

Also if its on the passanger side is that bad?
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  #2  
Old April 15th, 2004, 11:39 AM
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I think its because some of the trucks are diesals and some are the gas powered V8's I am willing to bet that most of the snorkles you have seen on the NAS trucks are Mantec's.
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  #3  
Old April 15th, 2004, 11:43 AM
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On NAS defenders the heater intake is on the right side, on other Defenders the heater intake is on the left side. So the snorkel has to go on the other side.
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  #4  
Old April 15th, 2004, 11:53 AM
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o yeah I ment to say that
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  #5  
Old April 15th, 2004, 12:04 PM
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I new you did, you just think faster then you type. I do to, but that doesn't say much as I type with just 2 fingers.

Shawn, LRM did a comparison on snorkels and I think the Mantec was one of the better choices.
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  #6  
Old April 15th, 2004, 12:58 PM
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Does a snorkel effect your on road performance negatively?
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  #7  
Old April 15th, 2004, 01:38 PM
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It shouldn't. You are now drawing cooler, more dense air for combustion. If your air intake faces forward there should be a small "ram effect" that should further improve the air intake process as speed increases. I would love to hear what others have to say. I am not an engineer, nor do I play one on T.V.!
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  #8  
Old April 15th, 2004, 01:42 PM
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yeah right think about all the duct work and shit running all over the hot motor. I think its benefits would be negligible but what do I know.
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  #9  
Old April 15th, 2004, 01:47 PM
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The snorkel I have is from Safari Snorkel (sold in the US by ARB).

Not many NAS 90's or 110's have them because they were engineered to be used without the external roll cage. I would suspect that is the main reason you don't see more of those here in the states. Some would say the styling of the Mantec is cleaner, and I would not argue with that.

The one I am running is on the passengers side, comes into the engine bay into a modified Range Rover Classic air filter housing, then into the carb. I have a K&N filter and am also running a Donaldson pre-cleaner.

IMO you should run a pre-cleaner on a snorkel, otherwise you are ignoring one of the main benefits it can offer - cleaner air from above the road surface. I think that any 'ram-air' effect is negligible, and would be more than offset by the benefits of a pre-cleaner.

Edit: It is not visible in my avatar photo, it was installed after that pic.
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  #10  
Old April 15th, 2004, 02:12 PM
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Some intresting reading.

http://www.defendersource.com/faq/En...tion.html#Hypo
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  #11  
Old April 15th, 2004, 03:01 PM
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The only benefit I see in a snorkel is the obvious and intended one - water intake prevention.

Cooler air: by the time it goes through all the winding ductwork it should be sufficiently warmed by the engine heat.

Ram effect: no way with all the ductwork.

Cleaner air: I doubt it. Considering the aerodynamic flow of a D90/110 any "dirty "air down below is just as easily guided up to the same level of the snorkel intake.

Precleaner: why? If it's cleaner air to begin with you don't need one. That's what a filter's for.

Placement: I prefer to run a different heater setup: remove the plastic duct and fit a tube heading to the front of the engine, near the radiator. You are not necessarily getting cooler air this way but trying to avoid any engine fumes if you just feed it from inside the engine bay. This avoids any water problems with the stock setup I have never had to worry about cleaning out the heater intake in any other vehicle! This is just a bad design. Then you can run the snorkel tube through this opening as it provides a more free-flowing path to the filter.
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  #12  
Old April 15th, 2004, 03:03 PM
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So if one on us car say a 96-97 model was on the passanger side that is normal?

Ill see if im bill gates and can post a pict
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  #13  
Old April 15th, 2004, 03:15 PM
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Thats a TDi setup through the wing like that. There is just barely enough room below and to the front of the heater. Stupid placement though, as it shrinks to a tiny opening on the LHD
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  #14  
Old April 15th, 2004, 03:52 PM
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Wow! Jeff Downs old vehicle.
Didn't think it was still going.
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  #15  
Old April 15th, 2004, 04:48 PM
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is that bad?

Does he post on here? if so whats his screan name?
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  #16  
Old April 15th, 2004, 05:33 PM
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Alright...here we go...

Quote:
Originally posted by artm
The only benefit I see in a snorkel is the obvious and intended one - water intake prevention.
Then I guess all the diesel delivery vans I see running around town with high air-intake snorkels are prepared to cross some deep water? Ridiculous and absurd. There's a reason that vehicles that are never intended to cross water use a snorkel for. If you saw how much dirt my Donaldson picks up in a week across the desert you might rethink that naieve statement.

Quote:
Originally posted by artm
Cooler air: by the time it goes through all the winding ductwork it should be sufficiently warmed by the engine heat.
It would take a long time for the air to get warmed up by the engines heat. Have you ever stuck your hand in front of your Range Rover's air intake and felt how fast the air gets sucked in? The heat transfer from plastic to air would take much longer than the air takes to pass through there.

Quote:
Originally posted by artm
Ram effect: no way with all the ductwork.
Agreed.

Quote:
Originally posted by artm
Cleaner air: I doubt it. Considering the aerodynamic flow of a D90/110 any "dirty "air down below is just as easily guided up to the same level of the snorkel intake.

Precleaner: why? If it's cleaner air to begin with you don't need one. That's what a filter's for.
I guess you're smarter than all of the different engineers working for all the different heavy truck and bus manufacturers who have come to the same conclusion - that cleaner air exists higher up off of the ground.

Man, you probably have a Tornado fuel saver in your air intake too huh?

Whatever.

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  #17  
Old April 15th, 2004, 07:00 PM
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This is the Mantec setup that is proper for NAS with roll cage. Installed it on my truck, and noticed no change except you can hear the air sucking into the precleaner on top so the motor sounds kinda cool.

Oh, and RoversNorth has a discount on them at the moment, $350 for the setup.

Also, I removed the K&N filter and replaced it with OEM. The K&N is a bit too large in the canister and actualy restrics air flow a bit. Might clean the air better though, don't know about that.
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  #18  
Old April 15th, 2004, 07:10 PM
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"If you saw how much dirt my Donaldson picks up in a week across the desert..."

I would think if you're running in the desert you would claan the filter daily. This use is not normal so it requires not normal attention.

"I guess you're smarter than all of the different engineers working for all the different heavy truck and bus manufacturers who have come to the same conclusion - that cleaner air exists higher up off of the ground."

Well, these vehicles are quite a bit taller than a D90 to perhaps benefit from the "cleaner" air up there. You're telling me that 7 feet gives you appreciably cleaner air than 4??? I doubt it! There's plenty of commercial trucks not using snorkels. If it was such a proven technology I would think they would - FedEx, UPS, etc..

If you want colder air then run a tube to the front of the grill.
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  #19  
Old April 15th, 2004, 07:11 PM
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The LR Manual "Working in the Wild" suggests snorkels for dusty conditions as the long tubular intake provides a "cyclonic" dust filtering effect, and it further recommends emptying the dust out of the hose periodically. After seeing the cyclonic effect of the Dyson vacuum cleaner, that explanation makes sense to me.
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  #20  
Old April 15th, 2004, 07:15 PM
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Yeah, Art, you're right.

Your scientific analysis and personal experience has shown me that you're right.

Thanks.
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