Forced Air due to Snorkels???

**scarry** · 26th September 2010, 07:36 PM

Originally Posted by Slunnie

I think that you're getting a range of different induction techniques all mixed up, but in short I don't believe that you get a ram effect from the snorkel. If anything, I think that they reduce performance slightly as they restrict the airflow.

The advantage is that they draw cleaner air compared to inside a wheel arch, and they keep more water out (under the airbox will still draw water). I'm not even convinced that they draw cooler air to be honest as the air from within the inner guard doesn't become heated.

Exactly

I have had the same D2 for many years before fitting a safari snorkle.It definitely greatly reduces the dust in the airfilter in dusty conditions,and gives you a lot more confidence in deep water crossings.

**Jason789** · 26th September 2010, 07:45 PM

Hello to everyone that have personally fitted or had fitted a snorkel to their D2.

What is the real answer, I mean that was there a noticeable power increase or decrease when they had their snorkel fitted(whatever brand or home made)??

Is that not the real answer as to whether there is a ram effect or power gain from cold air???

I have yet to fit a snorkel, so I don't know the answer.

Cheers

Jason

**bsperka** · 26th September 2010, 07:56 PM

Guys,

Whilst I might have some of the ideas mixed together, the agreement I'm getting here is what I was seeking - its the cleaner and cooler air that is the main benefit of a snorkel on the road.

It was hilarious to hear the club captain of a 4wd club talk about the forced air / rammed air benefit of the snorkel on his land rover - that was, until I realised he was being dead serious. Which was even funnier.....

**John W** · 26th September 2010, 08:03 PM

Jason; I had my D2 for quite a number of years prior to fitting a Safari Snorkel. Some times I feel there is a slight improvement humming along at 100k but it is probably more mind over matter. Do not fit a snorkel if it is just performance that you are looking for as probably it will reduce performance from wind resistance. Fit a snorkel if you will be going into water anything more than about 600mm deep or want to reduce the amount of dust getting to the filter. Even if the claims are true about cold ram air you could probably get more performance spending the money in other ways.

**bitdist** · 26th September 2010, 08:14 PM

I've had 2 x D2's and both had a snorkel and both are/were not as responsive with the snorkel connected. If I disconnect it, it feels like it has just been chipped !!
I would still get one though just for the occasional deep water etc ( once all the other holes in the airbox ect are sealed up)

cheers

**Blknight.aus** · 26th September 2010, 08:22 PM

there is a small improvement in performance in a petrol engine when you fit a snorkle PROVIDING it is the right type of install and the previous air intake wasnt set up for cool air intake.

on a turbo diesel there is no significant difference in performance due to the turbocharger doing its thing.

a RAI type of "snorkle" just gets you cleaner cooler air into the engine and thats good, it wont keep out water but it will generally stop a "splashup" from hydraulicing your engine

a properly sealed up snorkle like a safari (assuming its installed properly and your filterboxes duckbum works properly) move the air intake in total up to about the top of the roof so you'll run out of air to breathe before the engine.

**bob10** · 26th September 2010, 09:00 PM

I must thank all of you , once again I have been given advice which will help me make a decision on setting up my d2 for my particular use. Since joining AULRO it is obvious Land Rover owners are a switched on bunch, and believe me, your advice is taken on board. All I have to do now is convince my wife the money saved should be spent on a decent air compressor[ or fridge, or dual battery setup] wish me luck,
Bob10

**Pedro_The_Swift** · 27th September 2010, 06:26 AM

ok,, now that Bobs made his decision I can go here,,

IF there is ( for arguements sake)a ram air effect with a forward facing snorkle--
is there a corresponding vacuum/venturi effect when the snorkle is reversed?

(think highway speed)

**strangy** · 27th September 2010, 07:35 AM

Originally Posted by Pedro_The_Swift

ok,, now that Bobs made his decision I can go here,,

IF there is ( for arguements sake)a ram air effect with a forward facing snorkle--
is the a corresponding vacuum/venturi effect when the snorkle is reversed?

(think highway speed)

Isnt more about the way you hold your tounge more than the snokel position.

For the turbo diesel on the D2, Safari snorkel, no change in performance, my 2 cents is that the speeds travelled and the design of the snorkel create little ram effect and would be cancelled out by the snorkels aerodynamic inefficiency anyway. Seriously its a 4 wheel drive not a race car.
Foreward or backwards, unless you are obstructing the intake,
ambient conditions (air temperature, density and humidity) will always have a greater influence on the engines performance than whether a snorkel is fitted or not.
Which is why aircraft on some days have to offload some weight, increase take off distance or are unable to use an airstrip at all if the conditions arnt right.

cheers

**85 county** · 27th September 2010, 08:57 AM

Originally Posted by Pedro_The_Swift

ok,, now that Bobs made his decision I can go here,,

IF there is ( for arguements sake)a ram air effect with a forward facing snorkle--
is there a corresponding vacuum/venturi effect when the snorkle is reversed?

(think highway speed)

Ram air is really something we should all forget about. The ability to turn velocity into pressure is difficult at least. It’s a long boring (to most) story to try and explain why and even once all the math’s are done there’s still a lot of witchcraft to follow.

A snorkel on a land rover ( or any other 4x4) resembles nothing that would produce any real pressure.

FLOW is a different topic altogether. Making clean cool ( cooler ) air available is what a snorkel is all about. Water crossings have already been covered. Dust and muck also covered. But there’s also the rise in under bonnet temps and dust being sucked up by the fan while tooling around in the bush.

If there’s one reason to fit a snorkel, that’s it. Moving the air supply higher or further away from the muck. Diminishes the chances of a motor failing and wear though ingestion.

Venturi effect. Sure if you turn your intake sideways to the airflow and then only at higher speeds. This would assume that speeds where high enough and that airflow wasn’t disturbed by other parts of the vehicle.

Vacuum. Basically the same as above. However speed or airflow is important here. At slower speeds there would be a vacuum present but this would change to a pressure increases as airflow increases.

There was an old argument ( old school) about forward or rearward facing inlets, as to which setup provided the cleanest air. It was not uncommon to see rearward facing intakes on every thing from tractors, 4x4 and trucks.
I remember a driver of an ERF ( late 70s) placing his hat on the roof at 100klm, just in front of the air intake. The hat didn’t move, in this case the ERFs benefitted from turning the intake 90 deg sideways. We had to raise the intake nearly a meter to get the same benefits.
That takes us back to witchcraft. If it works do it.

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