reverse snorkle intake
Submitted: Tuesday, Jul 10, 2007 at 22:04
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47599
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Gary
Can anyone help me with an answer to this question?
I was travelling home from work in
Canberra and a Patrol (I think) passed me and had the intake of the snorkle pointing to the rear. I do not know if it was a local or someone passing thru on their way home from the snow. Can anyone give me an explanation for this? Maybe the owner will see this post. Is it a cold air thing, if it is, for those based in the cooler climes is it something we should be trying?
Your
views would be appreciated.
I am also the owner of an new explorist 600 (50th presssie from the wife and my mates) I am coming to grips with it but if there is anyone in
Canberra area who is
well versed with them and who wouldn't contacting me to give me some tuition on getting the most out of it, would be appreciated e.g. downloading waypoints from explore oz treks etc. Am doing the Flinders in Feb/Mar 08.
I am not a regular poster to the
forum but I do find a lot of invaluable tips and suggestions contained within the postings. Their is a lot of knowledge ot there.
Reply By: cokeaddict - Tuesday, Jul 10, 2007 at 22:10
Tuesday, Jul 10, 2007 at 22:10
People sometimes reverse the
snorkel head to stop excessive
water entering during rainy days. The theory is that in heavy rain, heaps of
water can be sucked into the intake and if things are NOT properly sealed, can cause considerable damage to an engine, especially a diesel. Personally i agree with the theory, in my opinion, running the head facing the back of the 4b still works fine, air is still inducted into the engine and there is no reduction in the amount of intake. I use it in rainy days and excessive dusty tracks.
Ange.
AnswerID:
251799
Follow Up By: Crackles - Tuesday, Jul 10, 2007 at 22:58
Tuesday, Jul 10, 2007 at 22:58
When rain enters a
snorkel it hits the rear of the air ram running back out through the slots so very little
water will actually get in. The rest is deposited in the bottom of the air filter & runs out the rubber one way valve. Before
water can get into most engines one would need to half fill the air filter with
water which is totally impossible from rain alone, no matter how hard it's pouring.
Many who play in deep bogholes or rivers often reverse the ram to stop large amounts of
water splashing in.
Cheers Craig.........
FollowupID:
512872
Follow Up By: handy - Wednesday, Jul 11, 2007 at 07:56
Wednesday, Jul 11, 2007 at 07:56
when i fitted my safari snorkle the destructions said silicone the rubber one way valve up ?? cheers
FollowupID:
512901
Reply By: Member - eerfree(QLD) - Tuesday, Jul 10, 2007 at 22:57
Tuesday, Jul 10, 2007 at 22:57
Gary
Cant help with the Explorist but I think cokeaddict is on the right track, a
snorkel will work OK both ways and the Ram effect would probably be negated by the bends and twists in a normal installation.
"Canberra" it was probably a Public Servant they tend to get most things back to front.
eerfree
AnswerID:
251812
Reply By: Truckster (Vic) - Tuesday, Jul 10, 2007 at 23:00
Tuesday, Jul 10, 2007 at 23:00
Some people do it cause they think it makes them feel like they are hardcore.
Others do it to keep dust out of the intake when in convoy etc...
AnswerID:
251814
Follow Up By: Member - Jeff H (QLD) - Tuesday, Jul 10, 2007 at 23:21
Tuesday, Jul 10, 2007 at 23:21
Nice touch Truckster
Jeff....
FollowupID:
512874
Follow Up By: kwozz - Wednesday, Jul 11, 2007 at 00:38
Wednesday, Jul 11, 2007 at 00:38
it almost looks like a post from jeff h made sense then....must be a sober moment?
FollowupID:
512889
Follow Up By: Member - Jeff H (QLD) - Wednesday, Jul 11, 2007 at 02:00
Wednesday, Jul 11, 2007 at 02:00
kwozz,
'Please explain'.
FollowupID:
512892
Follow Up By: jeffwa - Wednesday, Jul 11, 2007 at 14:20
Wednesday, Jul 11, 2007 at 14:20
I do it when I have to "charge" a mud pit. Normal
water crossings are slow and steady with little bow wave, but when you have to hit a long muddy section that's full of
water, sometimes you need some momentum and the bow wave can easily splash up to the
snorkel. I had the bow wave go over the roof once from a slight miss judgment of the depth. Lucky I had it round the other way as the
water was dripping off the back of the
snorkel when I got to the other end. Even then I had a small amount of
water enter the airbox, but luckily it didn't go any further.
FollowupID:
512957
Follow Up By: Gary - Wednesday, Jul 11, 2007 at 21:23
Wednesday, Jul 11, 2007 at 21:23
I can understand that one.
FollowupID:
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Reply By: Member - Pixie - Tuesday, Jul 10, 2007 at 23:56
Tuesday, Jul 10, 2007 at 23:56
i believe the Queensland police do it with their speed camera vehicles (camera mounted in the air intake) so that it is pointing at oncoming vehicles when parked on the side of the road
AnswerID:
251822
Follow Up By: Member - BUNDY BOY (WA) - Wednesday, Jul 11, 2007 at 07:55
Wednesday, Jul 11, 2007 at 07:55
very sneaky of them ...its also called entrapment....same as hiding flash for cash vehicles and hand helds.......but no one ever fights it........there to be seen from all angles.......openly
FollowupID:
512900
Follow Up By: Truckster (Vic) - Wednesday, Jul 11, 2007 at 11:28
Wednesday, Jul 11, 2007 at 11:28
people have fought it.. entrapment was deemed not to be illiegal in this sort of traffic case. even made today tonight o some pox show like that.
FollowupID:
512942
Follow Up By: Wizard1 - Thursday, Jul 12, 2007 at 13:53
Thursday, Jul 12, 2007 at 13:53
The Queensland Police do not mountb their camers in snorkels. Their 100 series have the standard Toyota box top type
snorkel and aren't turned around like the Safari type.
The camera is mounted in the back with the operator sitting next to it.
Now I've heard everything. Why would the Queensland police use those sort of tactics when they can nab hundreds in the M1 just parked on the side in full view with a
sign saying "speed camera in use" next to the vehicle?
Oh, I know a conspiracy theory.
FollowupID:
513123
Reply By: Hero - Wednesday, Jul 11, 2007 at 00:19
Wednesday, Jul 11, 2007 at 00:19
I wouldnt recommend it, If the
snorkel head is fitted reverse and driven at high speed, the intake will be drawing air from the low pressure slipstream area behind and create a vacuum in the head. This could drasticly reduce perfomance, even drawing air out of the intake system at high speed.
AnswerID:
251826
Follow Up By: Member - JohnR (Vic)&Moses - Wednesday, Jul 11, 2007 at 08:30
Wednesday, Jul 11, 2007 at 08:30
Keeps the magpies out of it though. Had one displace the grill in the intake last week.
FollowupID:
512911
Follow Up By: Kev M (NSW) - Wednesday, Jul 11, 2007 at 08:48
Wednesday, Jul 11, 2007 at 08:48
Is that what the teeth in the diff chewed on?? :)
Kev
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FollowupID:
512917
Follow Up By: John R (NSW) - Wednesday, Jul 11, 2007 at 19:52
Wednesday, Jul 11, 2007 at 19:52
Horsefeathers!
You'd have to be travelling at half the speed of light to come even close to getting negative pressure with a
snorkel head turned around backwards. You won't even get the slightest sniff of ram recovery until 140kt (yes, knots), and that's with an intake with a straight line and facing into the relative airflow, not something with friction/inertia losses associated with a change of direction of greater than 100 deg, such as a
snorkel intake.
FollowupID:
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Follow Up By: Member - Davoe (Nullagine) - Thursday, Jul 12, 2007 at 01:47
Thursday, Jul 12, 2007 at 01:47
with
John R (NSW) - the force of recipricating pistons sucking air in is so far in magnitude against negtive airflow from a backward facing intake that the 00000000000000000000000000.000000001 % if you could meausure it would have to make a difference to be bothered
FollowupID:
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Follow Up By: kiwicol - Friday, Jul 13, 2007 at 18:57
Friday, Jul 13, 2007 at 18:57
Hi Hero have a look at European Trucks as most of them have their air intakes behind their cabs or on the sde with fins facing to the rear, i have found facing the head to the rear helps to keep dust and heaps of bugs out. Col
FollowupID:
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Reply By: Member - Bucky (VIC) - Wednesday, Jul 11, 2007 at 06:50
Wednesday, Jul 11, 2007 at 06:50
The motor is still going o suck in the air it needs to function. No matter if it is facing forward or backwards.
Excessive dust or heavy rain will not be induced into the engine, if facing backwards
I'm nor too sure about the " Ram " effect being negated by spinning the head backwards, I will leave that to the experts, but I do know that the Genuine
Snorkel, fitted to my Navara, has a real tight restriction type of " goose-neck " ,, that one puzzles me and I have wondered if I modified it a little to remove that goose-neck, what would it do to my air intake sensor ,,because it confuses my logic just a little
Any comments from people that have done this would be greatly appreciated !
Cheers
Bucky
AnswerID:
251833
Follow Up By: Member - JohnR (Vic)&Moses - Wednesday, Jul 11, 2007 at 08:33
Wednesday, Jul 11, 2007 at 08:33
Nearly had a magpie neck in last week rather than any goose-neck! One decided to commit hari-kari and Heather extracted it when I stopped.
FollowupID:
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Follow Up By: Truckster (Vic) - Wednesday, Jul 11, 2007 at 11:30
Wednesday, Jul 11, 2007 at 11:30
The ram effect. one of the comp dudes gained many KW of power without a head on his
snorkel at all on a dyno but that is also standing still which is different again.
most comp trucks now have snorkels facing backwards with no head at all..
FollowupID:
512943
Reply By: Member - Kiwi Kia - Wednesday, Jul 11, 2007 at 08:12
Wednesday, Jul 11, 2007 at 08:12
I have
mine facing the rear so that it does not act like a hook and catch low branches and vines in the bush. Not a good experience having to buy a new top to replace one that has been ripped off by a low branch :))
Dessert travellers don't normally have to worry but it is a common problem on bush tracks.
AnswerID:
251845
Follow Up By: Member - Davoe (Nullagine) - Thursday, Jul 12, 2007 at 14:40
Thursday, Jul 12, 2007 at 14:40
one place I worked had to remove them from the utes when they became factory standard - they just dont last long out bush
FollowupID:
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Reply By: Andrew-rodeo - Wednesday, Jul 11, 2007 at 18:48
Wednesday, Jul 11, 2007 at 18:48
If the car was on gas, it is turned around to prevent the engine stalling on decellaration.
AnswerID:
251942
Reply By: Voxson - Wednesday, Jul 11, 2007 at 22:08
Wednesday, Jul 11, 2007 at 22:08
I have a standard "NISSAN"
snorkel which is very similar or maybe even the same as an "AIRTEC" which TJM flog.....
These snorkels are crap design...(in my opinion)........
Cant spin the head backward because it hits on the "A" pillar when it gets to about 40degrees turned....
All the water "rain" seems to find its way to the air filter and is quite often an internal mudpit...
When i am driving on dusty roads which are busy i have to take the head off....
My next
snorkel will be a "SAFARI" for all the obvious reasons...
On my GQ i cut out a little square of flywire and put it in behind the front cover and it worked a treat for insects also...On a Safari that was...
AnswerID:
251980
Follow Up By: Truckster (Vic) - Wednesday, Jul 11, 2007 at 22:12
Wednesday, Jul 11, 2007 at 22:12
and you cant run a donaldson on top of those airteks either.
FollowupID:
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Follow Up By: Voxson - Wednesday, Jul 11, 2007 at 22:56
Wednesday, Jul 11, 2007 at 22:56
A Donaldson will be my next purchase when i get a real
snorkel..
FollowupID:
513050
Follow Up By: Truckster (Vic) - Friday, Jul 13, 2007 at 15:34
Friday, Jul 13, 2007 at 15:34
Finally got my Auto gear coming :) Dude did a manual conversion to a 4.5 petrol.. I got everything !!!! Cheaper than the $~7k quoted too!
FollowupID:
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Follow Up By: Voxson - Friday, Jul 13, 2007 at 17:09
Friday, Jul 13, 2007 at 17:09
Mate, if an auto conversion was $10k,,, i rekon i would part with the money...
Who in their right mind would convert a 4.5 over to a manual?
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Follow Up By: Truckster (Vic) - Friday, Jul 13, 2007 at 17:10
Friday, Jul 13, 2007 at 17:10
easy to say if you have the 10k layin round :(
the bloke did the conversion on a high HP Turboed 4.5.... but I wonder how long the clutch will last!
FollowupID:
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Follow Up By: Voxson - Friday, Jul 13, 2007 at 21:44
Friday, Jul 13, 2007 at 21:44
hmmm,,,i still rekon an auto behind power is the go..
But call me new fashioned...
Clutch,,,, well,,,, he had better have a change over ready...lol....
If i could put an auto in my ST1300A i would,,,, but having said that,,, the FJR1300AS is pretty close to auto.....
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Reply By: Bonz (Vic) - Sunday, Jul 15, 2007 at 09:11
Sunday, Jul 15, 2007 at 09:11
The only real reason I have seen and been told of is to reduce mud and water rushing down the tube in great gollops when rushing thru a puddle or muddy quagmire. Comp trucks do it sometimes during wet events.
There is no worry with it facing backwards regarding air being sucked OUT of the system as the eddy effect wont kick in till astronomical speeds are reached. Rain isnt a worry either as it will run down the back of the snork, what little gets in that is. Wildlife entry is a problem but it rare.
Most people do it
on the road due to the W@#ker Factor IMHO
AnswerID:
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Reply By: Waynepd (NSW) - Sunday, Jul 15, 2007 at 09:35
Sunday, Jul 15, 2007 at 09:35
Dusty convoy conditions is the only time i have ever done this. It just saves the air filter from clogging up prematurely. No reason to do it on tar roads.
So this guy may have been returning from a trip and forgot/hadn't had a chance to face it forward or he is a wanker.....quick tip....if he had fog lamps blazing this would also give you a clue...
AnswerID:
252481