Fuel consumption & snorkels

Submitted: Wednesday, Apr 13, 2005 at 12:07
ThreadID: 22022 Views:2643 Replies:8 FollowUps:9
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Hi, I have recently fitted a Safari snorkel on my GU 3.0lt. Over 4 tanks of fuel I have noticed a significant increase in fuel consuption. 15 to 18% on average.
Has anyone experienced similar?

Thanks
Charlie
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Reply By: Member - JohnR (Vic) - Wednesday, Apr 13, 2005 at 12:35

Wednesday, Apr 13, 2005 at 12:35
charlies, have you checked your air filter, I have found significant insect impact on mine that could combined with the dust increase fuel useage. I did hear the turbo a bit more buy don't know about fuel useage.
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AnswerID: 106515

Follow Up By: charlies - Wednesday, Apr 13, 2005 at 13:10

Wednesday, Apr 13, 2005 at 13:10
Yes, checked the air cleaner, in fact it is near new. and is amazingly clean after very dusty Easter. I will replace it again to be sure.
It is interesting you mention turbo noise. i notice quite a hiss on deceleration. I have not heard in similar vehicles I have driven (or at least don't recall)

Cheers
Charlie
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FollowupID: 363539

Reply By: Member - Poppy (QLD) - Wednesday, Apr 13, 2005 at 12:44

Wednesday, Apr 13, 2005 at 12:44
G'day Charlie
Had the same problem, so checked air cleaner and found it was fairly dirty.
Just replaced it 2 days ago so will wait and see if I get better results now.
Cheers Poppy
AnswerID: 106517

Reply By: Member - Banjo (SA) - Wednesday, Apr 13, 2005 at 13:03

Wednesday, Apr 13, 2005 at 13:03
See my post 20917 (and subsequent comment). Sounds a monty for the restrictor to me..... but not all snorkel fitments in that brand have a restrictor. Apart from the noise I had, I do recall laying a smoke trail on acceleration (seen at night in following headlights - not strong enough to see in daylight) - that smoke being half burnt fuel of course - my economy would have been suffering (not measured). While my problem noise is gone and the smoke is gone, I do get a bit of harmonic noise from the snorkel but I want efficient breathing !
AnswerID: 106520

Follow Up By: charlies - Wednesday, Apr 13, 2005 at 13:42

Wednesday, Apr 13, 2005 at 13:42
G'day Banjo
just read your archive. I thought I was being a bit picky, but obviously not alone. Since fitting the snorkel I have experienced poor fuel, noise and vibration. There was a rattle from a poorly fitted clamp on the tube under the guard, but that was easily fixed.

I can't see any restrictor

Hmmm..... the plot thickens

Cheers Charlie
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FollowupID: 363540

Follow Up By: Member - Jeff M (WA) - Wednesday, Apr 13, 2005 at 21:50

Wednesday, Apr 13, 2005 at 21:50
Yep, after Banjo's origional post I check the air ram on my safari, found a whopping huge restrictor. Got rid of it, I know how some more of that "hissing" you talk about but overheating problems are cured on hot days going up hill and fuel consumption is FAR better. Accelleration had improved no end, especially in low revs.
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FollowupID: 363603

Reply By: flappa - Wednesday, Apr 13, 2005 at 13:36

Wednesday, Apr 13, 2005 at 13:36
Its not uncommon to get a slight increase in fuel use with a snorkel.

15- 18% on . . . what 13/100 or so , is still only around 1-2/100 per hundred extra.

Not a lot when you consider the benefits on having one fitted.
AnswerID: 106521

Reply By: old-plodder - Wednesday, Apr 13, 2005 at 17:16

Wednesday, Apr 13, 2005 at 17:16
I don't have a snorkel but am looking at fitting one.
The salesman at tow well known 4wd shops told me I would get better fuel consumption (less litres / 100k) due to the ram effect of the snorkel anfd better breathing.
I assume this does require the snorkel to be a larger dia than the rest of the intake :-).
Sounds like this is not the case! Correct?

AnswerID: 106546

Follow Up By: charlies - Wednesday, Apr 13, 2005 at 17:52

Wednesday, Apr 13, 2005 at 17:52
G'day
There is little if any ram effect. The engine actually sucks more than that could be forced down there. The real advantage is cool air and hopefully dry air. The diameter isn't that critical, long as it is not rediculously small. The important thing is good flow. I suspect in my case I am getting turbulance at some point in the snorkel thus reducing the flow. Or maybe just lost the venturi effect from the standard setup.
Whatever, its frustrating as I don't really intend deep river crossings or the like. Just peace of mind, just in case.
I guess as one of the other guys said, its only a couple mpg, which is hardly the end of the earth.

Cheers Charlie
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FollowupID: 363561

Follow Up By: Member - Jeff M (WA) - Wednesday, Apr 13, 2005 at 21:52

Wednesday, Apr 13, 2005 at 21:52
I have found the surf running slightly better with the safari and restirctor removed than without the snorkel, however it is a turbo diesel (therefore liking more air) and the factory air intake was quite restricted (probally to try and prevent induction noise). Main difference is on highway driving, not around town.
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FollowupID: 363604

Follow Up By: Member - Jeff M (WA) - Wednesday, Apr 13, 2005 at 21:53

Wednesday, Apr 13, 2005 at 21:53
And even if it does make it worse on your vehicle it would be less than putting bigger tyres on, but I bet the fuel consumption wouldn't stop you doing that! ;-)
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FollowupID: 363605

Follow Up By: old-plodder - Sunday, Apr 17, 2005 at 18:03

Sunday, Apr 17, 2005 at 18:03
Thanks for the replies.
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FollowupID: 364109

Reply By: muzzgit (WA) - Thursday, Apr 14, 2005 at 01:40

Thursday, Apr 14, 2005 at 01:40
Had a snorkel put on the GU about a year ago. Fuel consumption is much the same, but I don't pay too much attention to it. City driving I average around 860 K's to about 117L. I havn't done a country run that hasn't involved 4WDriving or I hav'nt been towing, so I can't say.

I have recently noticed the smoke at night as stated above. But only when I give it a boot full and it takes a second or two for the auto to kick back, then no smoke, lots of go.

When off road, people following me often say they can't believe its a diesel, cos they never see any smoke. (and it goes so quick. te he)

Any air ram effect would only possibly happen at high speed --- over 90. Same as the intercooler on the top is only truly effective when cruising at 80 or more. The biggest positive with the snorkel, and this is why I got one.....
The aircleaner is now always clean.
AnswerID: 106639

Reply By: Member - Banjo (SA) - Thursday, Apr 14, 2005 at 08:30

Thursday, Apr 14, 2005 at 08:30
I put the so called air ram effect down to pure sales hype - plain physics suggests that the plumbing with the twists turns and simple surface drag would negate most of the ram effect at anything less than significant speed. With the restrictor in place (the customer is kept in the dark on that) on some models, the ram air effect could be close to the purest bulls**t you'll ever hear over a sales counter.
AnswerID: 106648

Follow Up By: govo - Thursday, Apr 14, 2005 at 19:43

Thursday, Apr 14, 2005 at 19:43
HI Banjo..where abouts is this restrictor siuated..at the top or down the bottom of the snorkel ?
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FollowupID: 363758

Follow Up By: Member - Banjo (SA) - Friday, Apr 15, 2005 at 08:37

Friday, Apr 15, 2005 at 08:37
Its on the top of the main tube by your A pillar - just take the scoop off the top of the snorkel and there it is. As said, its not used on all models.
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FollowupID: 363805

Reply By: Member - Banjo (SA) - Friday, Apr 15, 2005 at 08:58

Friday, Apr 15, 2005 at 08:58
Yep - forgot to say - my primary reason for having the snorkel fitted was to get clean air to the filter - the original setup was hopeless in the bush - sucking air in from the wheel well.... very dirty, very soon.
AnswerID: 106848

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