 | Home > Td5 > Snorkel flow rates. |
 
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| 34064 Member Since: 12 Dec 2023 Location: South Central Posts: 191   
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I have the cheapo Britpart one and I'm thinking between that and the LR ducting it's proving a bit of a choke point 110 Td5 Ex Utilities slowly converting into a pop top camper one day
Build thread:https://www.defender2.net/forum/post1024784.html#1024784 |
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19th Sep 2024 4:58pm |
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| Chicken Drumstick Member Since: 17 Aug 2020 Location: Near MK Posts: 751
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Considering the size of the tube on most snorkels and that they are basically just a tube and given the cfm requirements for the power levels of most Land Rover's, I'd be most surprised if they represented any kind of restriction to any meaningful amount.
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19th Sep 2024 8:13pm |
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| portal pat Member Since: 05 Jan 2015 Location: South. Very south. Posts: 36  
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Should have said, my TD5 has a lot of power. Not stock. Nothing suggests poor workmanship like wrinkles in the duct tape.
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19th Sep 2024 10:15pm |
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| jimbo55 Member Since: 15 Jul 2020 Location: Midlands Posts: 399
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Pete bell did some testing years back
Snorkels are a lot more restrictive than you’d think, even if the diameter is the same as the existing pipework, the fact the length increases significantly is where the main impact is. |
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20th Sep 2024 8:54am |
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| mturri Member Since: 13 Jul 2010 Location: All over Posts: 33  
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Did some modelling work on friction losses (*), standard vs raised air intake; what are you after? (*) AAP sensor seats inside air filter box, so at constant atmospheric pressure, reduction in measured AAP is roughly equal to intake friction losses (including that across air filter as AAP sensor is on downstream side). 24 yrs of Td5 ownership D110 Td5 MY06 fully tuned up ex-D2 Td5 MY04 Auto ex-D110 Td5 MY00 ex-D2 Td5 MY00 ex-D2 Td5 MY99 ex-D1 300Tdi MY89 ex-D90 200Tdi MY87 |
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21st Sep 2024 3:56pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20418
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Basically wherever you have the narrowest aperture, which is the narrowest tubing or point in the inlet pipework, is the smallest restriction and any extreme angles add to flow delay.
So you want to aim for the largest dia apertures / pipework that is feasible, with a sweeping smooth angle where possible, so a 45 degree angle is far better than a 90 degree bend where possible. I don’t think there is much point in increasing the diameter significantly larger than the air box entry or exit whatever it may be. You can get scientific with it with air mass and flow etc if you want to, a nice smooth tube and smooth bends aide flow with less obstruction, it can pay to try and spin the incoming airflow, but in doing that you can add a little restriction in itself. Does however, create a cyclone effect, but again that is easily lost if the inlet isn’t smooth and sweeping. You can get a ram air effect as well like I get with a Safari, but for example a Mantec RAI doesn’t do that. The only way I think you can test these things is by air metering and specs, which is easier said than done in real world situations. One thing for sure is guaranteed, the LR black plastic pipework behind the wing IS restrictive. $W33T $0U7H3RN $UG4R 🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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21st Sep 2024 8:21pm |
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| portal pat Member Since: 05 Jan 2015 Location: South. Very south. Posts: 36
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[quote="mturri"]
Did some modelling work on friction losses (*), standard vs raised air intake; what are you after? (*) AAP sensor seats inside air filter box, so at constant atmospheric pressure, reduction in measured AAP is roughly equal to intake friction losses (including that across air filter as AAP sensor is on downstream side).[/quote I have a VNT turbo along with all that needs to go with that and am currently running a Safari snorkel. I'm wondering whether there are any other snorkels that flow better? Nothing suggests poor workmanship like wrinkles in the duct tape. |
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21st Sep 2024 11:13pm |
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| portal pat Member Since: 05 Jan 2015 Location: South. Very south. Posts: 36
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I run a Safari snorkel and initially had a Donaldson pre filter atop that. Changed to a regular snorkel intake and felt as though I gained a little torque rise. Nothing suggests poor workmanship like wrinkles in the duct tape. |
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21st Sep 2024 11:16pm |
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| Jabberwocky Member Since: 27 Oct 2021 Location: Luxembourg Posts: 223 
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I have a cyclonic head on my raised air intake and I think it has done its job well on various dusty trips I’ve done, but I do wonder if it’s too restrictive, I have a heavy camper and it does seem to struggle more than it should on hills and I think the engine is working too hard. I’ve decided to reinstate the OEM side grille but leave the pipe up the A pillar in place so I can switch between the 2 as needed. I have no more dusty trips planned until our big trip in 2026 so the raised intake is unnecessary.
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22nd Sep 2024 12:22pm |
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