to snorkle or not to snorkle?

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I think I speak on behalf of many...

I just want one. I don't care what they do!

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Well I suppose they do look a bit Phallic.

I fitted mine because a friend had hydrauliced his RRC 3.5 going through a puddle on an outback road at 80Kmh. But I reckon the engine would stop before the water gets to the decker panel, so replaced it with the vent from Whitworths.
With regard to ram air. I measured about 0.5 inches of water positive pressure at 80Kmh on the input side of the air cleaner, ie bugger all. In any case the throttle does not allow the pressure into the engine.I think it does subjectively make the engine a little more responsive at small throttle openings

On a Superbike in a race with WOT at 280KMh there is a big difference, I think about 10 or so bhp on a Kawa 1100.
Regards Philip A

I noticed there are a lot of answers to the original posters thread.
Quite a few do not answer the guys question, on hid Discovery Series Two.

Aerodynamics is not an issue, there are none!
A Discovery is a "Blunt Vehicle", not like a Range Rover.

The air cleaner pick up is a small "reversed trumpet" behind the front headlight.

On this type of Land Rover, it does help in getting a free (unrestricted) flow, of cool, clean air.
I am very happy with the results on my Discovery.

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Originally Posted by RonMcGr

I noticed there are a lot of answers to the original posters thread.
Quite a few do not answer the guys question, on hid Discovery Series Two.

Aerodynamics is not an issue, there are none!
A Discovery is a "Blunt Vehicle", not like a Range Rover.

The air cleaner pick up is a small "reversed trumpet" behind the front headlight.

On this type of Land Rover, it does help in getting a free (unrestricted) flow, of cool, clean air.
I am very happy with the results on my Discovery.

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Now that is a good post!

Au contraire.
A lot more aerodynamic work went into a Disco 2 than a RRC.
Look at an RRC and you will see a bludy great drain gutter over the windscreen.
I was going to cut it off until I discovered there were three layers spot welded together, one the bit that bolts to the frame, a sandwich filling of the roof, then the gutter on top. If I had cut it off then The roof would have flapped around. This is a result of it being designed in 1976.

The Disco has a much nicer transition there and apparently this is one of the most important transitions that determine how much air remains attached flow over the roof. You will see that new 4x4s have a much "faster" windscreen, with a very gentle transition to the roof. the Holden Captiva as a great example. It is also teardrop shaped, with a narrowing of the back and the rear roof sloping down

The Discos rear windows are much flusher with the body than a RRC and the corners are much gentler. The grille is much smoother .
It is these types of details that determine the Cx.

It would be unbelievable if a Disco2 did not have a lot of aero work on it, as by 1996-7 fuel prices were quite high. Certainly I have seen reports of extensive aero work on the 38A which was earlier than the Disco 2.
Regards Philip A

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Originally Posted by JDNSW

(for example on my 110 they say no more than about two feet depth, which is no threat to the air intake just below the top of the mudguard about 20" higher). I have actually driven through water above the top of the mudguard without any getting in the intake, but would not want to do so for any distance.

John

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I'm not sure I understand this. I thought that the intake on 110/Defenders was the intake vent was on the side of the front fender (drivers or passenger side depending on year/model), not on the top of the fender. Am I mistaken? The snorkel on my Defender sits over the vent that was there beforehand.

When you do some crossings water comes up over the front albeit briefly and along the sides. I would have thought the raised intake would definitely make this less of a worry.

I put a snorkel on my Disco after doing one short river crossing where the water was a little bit deeper than I was comfortable with.

I decided the cost of the snorkel was less than the potential damage that could be caused and the aggro saved by hopefully not getting stuck in a river because I got water in the air intake.

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Originally Posted by PhilipA

Funny, I have just taken mine off my RRC, after reading that the A pillars and windscreen area of the car are among the most important for air resistance reduction and that makers spend many hours testing the windscreen roof and side window /mirror interface.

I till have the cool air via a boat bilge vent on the decker panel.


I have also fitted 30 "airtabs" to the rear. It looks a bit funny but should give up to 3-4% increase in economy.

By the way cool air does not increase economy, just power. Hot air reduces power but improves economy, hence the fuel saving devices like insulators for injectors.
Regards Philip A

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Aerodynamics and RRC in the same sentence now thats funny, i think LR was looking at a chipped brick when they designed the RRC. The "norkle " would be the least of your worries !

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Originally Posted by JamesH

I'm not sure I understand this. I thought that the intake on 110/Defenders was the intake vent was on the side of the front fender (drivers or passenger side depending on year/model), not on the top of the fender. Am I mistaken? The snorkel on my Defender sits over the vent that was there beforehand.

When you do some crossings water comes up over the front albeit briefly and along the sides. I would have thought the raised intake would definitely make this less of a worry.

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The 110 and at least early Defenders have the inlet in the top of the mudguard (cars do not have fenders in this country), but I was referring to the actual intake on my 110, which, while it gets its air from the RH vent on top of the mudguard, is actually just in front of it and facing forward. Not sure about later Defenders, I can't say I have noticed.

As you say, water does come over the front and along the sides - but only well beyond the depth countenanced by the manufacturer, which as I said is only about two feet (600mm). The raised intake would, as you say, make it less risky, but I would point outthat unless other precautions are taken, your axle and gearbox breathers will be under water, as will your alternator and fan, (the latter will not take kindly to it if the engine is turning fast) as well as the breather on your power steering reservoir and sundry electrical fittings which while splashproof, will not stand immersion (least of all the ECU). There is a lot more to preparation for deep wading than a raised air intake!

John

For all the contributors to my norkle gaf, thanks

The replies just cracked me up

You put a smile on my "ial"

Indeed there are.. but almost pointless without a snorkle or substitute!

As for Fender it was actually a play on words... obviously missed!