Benifit of snorkle ram

Submitted: Wednesday, May 10, 2017 at 18:18
ThreadID: 134834 Views:2978 Replies:7 FollowUps:16
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G'day everyone.

I've got a 99 HZJ75 Troopy and have always wonders why other owners remove the hat from the snorkel and replace it with a ram similar to what you see on trucks.

What are the advantages and or disadvantages of this modification?
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Reply By: Member - ACD 1 - Wednesday, May 10, 2017 at 20:00

Wednesday, May 10, 2017 at 20:00
Because it was ugly!

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Anthony
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Follow Up By: Member - ACD 1 - Wednesday, May 10, 2017 at 20:03

Wednesday, May 10, 2017 at 20:03
Oh!

It was also too high, wasn't aerodynamic and it was still ugly!

At least the safari head forces air into the diesel motor.

And did I say it was ugly?

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Anthony
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Follow Up By: Sigmund - Wednesday, May 10, 2017 at 21:11

Wednesday, May 10, 2017 at 21:11
I doubt that the ram effect warrants it. With every angle in the inlet tract you lose a significant amount of pressure. (I did the numbers for a workshop dust extraction system). Then the rate of induction is going to be pretty high regardless.
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Follow Up By: Member - ACD 1 - Wednesday, May 10, 2017 at 21:15

Wednesday, May 10, 2017 at 21:15
The main motivation was because it was Ugly!

Anything else is a bonus

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Anthony
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Follow Up By: Bob Y. - Qld - Wednesday, May 10, 2017 at 22:20

Wednesday, May 10, 2017 at 22:20
Beauty in the eye of the beholder!

The ram heads on some later model 200(?) series, now they are ugly! :-)

Bob

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Follow Up By: mike39 - Thursday, May 11, 2017 at 07:44

Thursday, May 11, 2017 at 07:44
One model Land Cruiser (I think 80 series) had what looked like a football on top of the snorkel pipe.
It was there to cover up/disguise the top hat/centrifugal dust extractor hidden inside.
Now that WAS ugly!
Mike
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Reply By: RMD - Wednesday, May 10, 2017 at 21:10

Wednesday, May 10, 2017 at 21:10
With a naturally aspirated engine, a forward facing scoop can pressurize the air intake. The faster you go the more air is forced in. At reasonable speed the additional air getting into the cylinder MAY help with a cleaner burn and a slight increase in power. Fuel efficiency may improve slightly.
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Follow Up By: Member - ACD 1 - Wednesday, May 10, 2017 at 21:21

Wednesday, May 10, 2017 at 21:21
^^^^^^^^^^^^^^^^^^^^^^^^

What he says sounds good too!

A forward facing opening - moving forwards. Has to go somewhere!!!

You can't beat physics - but physical attraction can take a beating (god there ugly!)

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Anthony
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Follow Up By: Paul E6 - Wednesday, May 10, 2017 at 22:17

Wednesday, May 10, 2017 at 22:17
Nope. Wishful thinking.
Think about it, or go have a look at your intake. Yep, I have a snorkel.
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Follow Up By: Nomadic Navara - Thursday, May 11, 2017 at 19:24

Thursday, May 11, 2017 at 19:24
"With a naturally aspirated engine, a forward facing scoop can pressurize the air intake"

The amount of boost you can get for this is insignificant. Some years back I saw some research on this. It was done for racing cars. To get a significant boost the mouth of the scoop had to be equal to the cross section of the car and you would only get the significant boost over 100 km/h.

With figures like that you are not going to get much boost with the mouth size of the snorkel scoop at the speed that our 4WDs travel.
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Reply By: Michael H9 - Wednesday, May 10, 2017 at 22:02

Wednesday, May 10, 2017 at 22:02
I was reading about the German snorkel designed for the VW Touareg and VW insist it is rear facing rather than forward facing to not void warranty. They look quite odd when facing towards the rear.
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Follow Up By: Paul E6 - Wednesday, May 10, 2017 at 22:19

Wednesday, May 10, 2017 at 22:19
If I could I would definitely face mine rearward. Makes no sense to try to catch objects in your intake
The ram air thing is all marketing.
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Follow Up By: RMD - Wednesday, May 10, 2017 at 22:49

Wednesday, May 10, 2017 at 22:49
Air has density. It has mass. It is thin water. Ram air effect does work. Any positive pressure to alleviate engine vacuum is of some use.
However, the odd Eagle entering the intake will detract from the performance I suspect.

Face your snorkel rerwards means trying to create a vacuum on the entry!
Having a turbo will overcome that though. They can do that.
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Follow Up By: Michael H9 - Thursday, May 11, 2017 at 07:31

Thursday, May 11, 2017 at 07:31
I've also read where flying mud and water from wheels spinning gets caught by the snorkel, clogs the air filter and potentially wrecks the engine. More common than you think, the article says.
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Follow Up By: Member - ACD 1 - Thursday, May 11, 2017 at 09:40

Thursday, May 11, 2017 at 09:40
Michael

Are you talking about a forward or rear facing ram head?

Either way, I can't really see mud and water being thrown from the wheels and entering the open face. Sounds a bit like a "Hollywood Bullet" to me.

Also, the Rams are designed to expel water (albeit not a bucket full). How else would you use them in the rain?

Would love to read that article.

Cheers

Anthony
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Follow Up By: Batt's - Sunday, May 14, 2017 at 11:57

Sunday, May 14, 2017 at 11:57
Michael that's a bit extreme it may apply to mud racers but they usually position it out of harm's way but you do get a lot of wally's who can't help but smash their way through mud or water without thinking first or sitting in a bog with a rooster tail of crud shooting over their roof so some do deserve the repercussion of their actions. The average person who has some common sense won't have any problems.
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Reply By: Rangiephil - Wednesday, May 10, 2017 at 22:15

Wednesday, May 10, 2017 at 22:15
I tested the effect of a forward facing snorkel ram on a petrol engine RRC 3.9 V8 at full throttle at 80Kmh.
The ram effect was 1inch of water on a Minihelic air pressure gauge ie a bees dick.
Regards Philip A
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Reply By: splits - Thursday, May 11, 2017 at 14:34

Thursday, May 11, 2017 at 14:34
You could argue all day on this subject but it is hard to say what happens without seeing all the intake design and air flow statistics that the factory engineers were working with.

It reminds me of the days in the 1960s when ram tubes on hotted up street cars were all the rage. One magazine experimented with different size and length tubes on a small four cylinder car and only got reductions in power yet these things were used on many racing cars including formula 1.
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Follow Up By: The Bantam - Tuesday, May 16, 2017 at 21:57

Tuesday, May 16, 2017 at 21:57
ram tubes are an entirely different thing to a scoop head on a snorkle.

Ram tubes are about tuned intake length ........ they are known a proven to work, the math and the principles are well documented ..... as are the reasons they don't work when not done correctly.

cheers
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Reply By: Manic - Thursday, May 11, 2017 at 15:25

Thursday, May 11, 2017 at 15:25
Thanks for all the replies.

I think what I can take from this is it's potentially dangerous, especially with a diesel vehicle.

The only positive reason to do this is the stock hat is ugly and that's probably not reason enough to modify the vehicle.
AnswerID: 611040

Follow Up By: Member - Leigh (Vic) - Thursday, May 11, 2017 at 19:21

Thursday, May 11, 2017 at 19:21
If you are looking for another reason to change from std snorkel then your snorkel is probably in two parts and the join is poorly sealed and too low for those doing deep water crossings. Is it worth the $500 to change??
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Follow Up By: Member - ACD 1 - Thursday, May 11, 2017 at 19:34

Thursday, May 11, 2017 at 19:34
I just changed the ugly hat it was wearing! Definately not a $500 changeover

The snorkel body remains as original. Mine isnt in two parts, it is a single main body, a good sealing with sika flex in any joins will sort out possible water leaks.

Cheers

Anthony
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Too many places - too little time

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Reply By: Batt's - Sunday, May 14, 2017 at 12:07

Sunday, May 14, 2017 at 12:07
Manic don't be deterred from changing it you will get no ill effects that will cause any potential harm to you engine. Snorkel heads have flutes to divert excess water away even in the heaviest tropical downpour. You may get a couple of extra bugs out of you air box which is no big deal give on a go but the only thing I would stipulate it to get a reputable brand that has been tried and tested not a $2 knock off.
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