 | Home > Maintenance & Modifications > TD5 Raised Air Intakes 3", 4"? |
 
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| ibexman Member Since: 13 Dec 2008 Location: Essex Posts: 2945  
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I expect it is strangled of air with a Southdown I would disconnect it on road fit 90/100 inlet
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13th Feb 2018 1:21pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17369 
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The Nakatanenga snorkels look better (by far) that almost any other IMO, are larger bore than any others I know, and are available in both cage and non-cage mountings. A single Nak snorkel would look better than twin Southdowns.
A poor photo of the non-cage version for the Puma, but similar to the cage version and the Td5.  Click image to enlarge |
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13th Feb 2018 1:45pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2162 
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Sorry but thats ugly as sin and I expect an absolute fortune for what it is.
Theres very little point connecting/disconnecting for road/off road as it creates a weak point for water ingress. Question is would two southdowns actually help the airflow by a decent amount or not worth fitting? Last edited by bankz5152 on 13th Feb 2018 4:49pm. Edited 1 time in total |
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13th Feb 2018 2:10pm |
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| V8GPC Member Since: 18 Jul 2016 Location: Manchester Posts: 289
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When designing duct work for Local Exhaust Ventilation systems, there are airflow losses due to friction of the inner surfaces, plus losses for each bend and connection. All added together means when specifying the air mover (fan) you need to select one that can shift the appropriate volume of air to maintain the required in-duct velocity (which based on duct diameter) gives volume airflow. m3/s
Therefore making the assumption that the engine is the air mover; and snorkels would inherently put extra load on the engine to achieve the same volume flow (as without a snorkel) then by fitting two would definitely split the load; and therefore have an easier route for the required volume of air to be moved. m3/s. Having two comes down to esthetics, ducts ideally need to be smooth (corrigated adds friction) and juctions should never be 90 degrees or T shaped, they should be 45 and nicely curved, so worth considering how the two snorkels meet at the airbox. In most engines the air losses probably don't cause too much restriction; but for a performance point of view you need to let it breath as easily as possible. |
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13th Feb 2018 4:48pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17369
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And you think that this one isnt't ?! Click image to enlarge The fact that the Nak pipework appears to be about twice the CSA of the Southdown is probably a fair indication of the relative performance. The Nak also replaces (on the TDCi at least) the chronically restrictive underbonnet pipework whereas the Southdown does not. But beauty is in the eye of the beholder, and one man's "ugly as sin" is another's "ruggedly handsome". |
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13th Feb 2018 5:02pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2162
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Very true. Though the Southdown (2.75" hence asking about two!) also replaces the LR pipe work. Either way I've removed the LR intake long ago and replaced with a 3" intake pipe that runs to the airbox. Much easier and better than trying to seal up all the LR nonsense!
Now wondering if its worth me fabricating a 3.5" or even 4" custom snorkel. |
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13th Feb 2018 5:15pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785 
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I haven't got a snorkel but I replaced the airbox to wing pipework on my Td5 90 with 110mm ducting, taking the most direct route possible. It's big enough to fit your arm in.
At just over idle it will hold a towel against the wing so it shows how much air it pulls. I have also gutted my airbox to remove the water separator. I had an aluminium adaptor machined to replace the standard plastic 90° bend going into the airbox. It makes a decent difference to performance, and I'm sure it helps a lot with my VNT  2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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13th Feb 2018 6:41pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2162
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Cheers grafty, pretty much did the exact same thing after seeing pics on here (yours I think) though only 76mm not 101. How did you route the larger bore pipe? I can't see how I could run thicker ABS/steering column appear to be in the way!
Problem is I would rather not use the wing top as the intake if possible but I think I could squeeze a 3.5" or 4" pipe there and then to a RAC snorkel or a custom one. Or I could pretty easily fit two Southdowns (2.75") and a two runs of 3" pipe work which would run pretty close and direct to the air box. |
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13th Feb 2018 7:03pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785
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One lager pipe is better for flow than two smaller ones
I'ts a VERY tight squeeze but it goes down and below the steering column, under the brake master cylinder then into the side vent. (pretty much the same route as factory) I plan to fit a 200 tdi wing skin at some point and re route the air intake to the wing top so both snow vents are functional. currently the divers side on mine is there to vent heat (adaptor fitted for ducting - just not got round to re routing) 2002 90 Td5 Station Wagon 1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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13th Feb 2018 7:12pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2162
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Thats how I routed mine as well, though it was tight for a 3" under the steering column! I had to fit a hard plastic cover over the top of the pipe to stop the steering column from rubbing on the pipe and making an awful noise!
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13th Feb 2018 7:46pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8021  
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when i did the maths on mine a TGV needs just over 3.25" dia of pipework, a td5 i would of thought needs more air than a TGV with your setup, so 4" would be better yes. Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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13th Feb 2018 8:51pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2162
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Correct.
I ran through a few bits with an engineering friend of mine. Current set up 3" snorkel + 3" intake is good enough but could be improved and far better over standard. Twin Southdowns 2.5" snorkel with 3" intake pipe 32% better than my current set up 4" snorkel and 4" intake pipe 56% better than current So naturally the 4" is the better choice here but as a 4" snorkel doesnt exist (as far as I can tell after 3 hours on Google/forums) I would have to make one and find a suitable route for the 4" pipe. It's also something I would want to do properly with a lot of thought and time which I can't do right now. However I will return to the idea! (mainly down to not wanting a wing top snorkel at this time) So confident that twin Southdowns will be an improvement or at the very least the same as my current set up I've ordered some 3" intake and some couplers. Main reason for the thread is I am currently fitting my roll cage and the outer wings are off, making for very easy routing of the intake pipes! Which would be almost impossible with the wings fitted. Current plan is to run the intake pipes and secure in place but not plumb in until I have the snorkels in hand, then I can cut the wings as and when I need to. |
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13th Feb 2018 9:12pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324 
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While I'm not so enamoured with the fish tank on top, I just ordered the Nakatenganagrbleblahb, Nakatengaglleblabagabba ... 'Nak' RAI for mine. I'm aware we're not doing Fine Arts degrees but something about the ones that point forward in the airstream seem to me too aesthetically 'literal'. Turning them 180deg as I've seen a few examples of doesn't remedy that  
The mantec one is ok, could live with that, but I think peak niceness is this original LR model: Click image to enlarge But as has been pointed out, unless you're modifying it, they both use the standard convoluted intake piping inside the wing. I much prefer the idea of a direct feed to the filter but after the gen LR ladder and SD cage I've decided that drilling in to my body is to be avoided from now on, so the Nak one fits the bill in that regard too. Wondering if it clashes with the aerial though? Not a biggy, less work if it doesn't. I considered using the fresh hole as a new place for a BBUS, nice and loud, but of course access once it's gone off is easy, but then I was wondering if there was enough current capacity to run two in parallel: Thief finds out that the BBUS in standard location they tampered with was just a decoy, alarm goes off (!), thief finds loudest source behind old air intake, cuts that .... alarm still going off (!) - thoughts ? Solved the bowel problem, working on the consonants... |
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13th Feb 2018 9:16pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8021
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this is to the vehicle in the picture? ie double cab?
i ran a 4" pipe through cab for rear snorkel on a truck cab, used Ali tubing and Silicon hoses all from ebay to make it up. had a foam filter on the top. Allsiport do a very nice air filter large bore setup Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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13th Feb 2018 9:17pm |
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