 | Home > Maintenance & Modifications > Breather routing inside snorkel |
 
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2237   
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Evening all,
Just after some opinions on this idea. Will be running all my breathers to a manifold under the bonnet but really dont want to have to run the pipe out of the bonnet and cable tie it to the snorkel. Debating putting a pneumatic bulkhead fitting into the lower half of the airbox (pre-filter) and routing thr pipe internally right to the Safari snorkel top with it protruding just out of the end. Cant see any real issues with doing this, with it out the end of the snorkel it should not see any negative pressure from the induction. Any thoughts/opinions? Cheers Steve 02' 110 TD5 Double Cab Rebuild Thread |
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23rd Mar 2022 7:59pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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As long as the breather pipe goes all the way to the top of the snorkel and the pass through gland is watertight then it will be just fine.
A long time ago folks used to run the breather to the RAI pipe, in to it via a rubber grommet and then up to the snorkel top. |
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23rd Mar 2022 8:09pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Just remembered that the MOD had their breathers up in to the snorkel top from the outside, so running the breather up the inside and just to the outside of the snorkel top will work. If it is good for the MOD then...
 Last edited by geobloke on 25th Mar 2022 11:30am. Edited 1 time in total |
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23rd Mar 2022 8:16pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2237
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Spot on cheers, was just what I was thinking
02' 110 TD5 Double Cab Rebuild Thread |
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25th Mar 2022 10:22am |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5724 
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Because if you don’t run them to “fresh air” there will suction on the hose, then causing a vacuum in the axles/boxes. Either this may cause to suck the oil into air intake system or just promote water ingress into the components when wading. Some vehicles do the opposite and slightly pressurise them to stop ingress.
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26th Mar 2022 5:34am |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 2029
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How much space would all the breathers take up if run inside a RAI ? Just thinking you will be restricting airflow, however on a standard map that may not have an impact but worth calculating the percentage of reduced airflow you are going to get beforehand.
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26th Mar 2022 9:41am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17442 
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Whilst it is undoubtedly true that there will under most conditions be a partial vacuum (i.e., a lowering of pressure with respect to atmospheric) in the RAI pipework, I cannot myself see that there is any chance of oil being drawn from the axle to intake as long as the vehicle remains the right way up. I also doubt that the partial vacuum would be enough to draw air or water past the axle seals into the axle, although the PV will depend air velocity in the RAI which itself is proportional to the bore of the RAI. Something like the classic plastic Mantec RAI will be at a lower pressure than something like the huge Nak RAI since the air velocity for similar engine conditions will be higher since the RAI is much more restrictive. It would be interesting if someone was sufficiently intrigued to connect a manometer to the RAI to determine the internal pressure with the engine running at different load and boost conditions. You could design the entry of the breather into the RAI pipe to use the velocity of the air-flow to create a positive pressure in the axle breathers, but this would lessen the free-flow characteristics of the RAI. Bottom line, will you come to grief if you connect your breathers into the RAI? I think it is highly unlikely but it is possible under some circumstances, and if you're going to the trouble of extending them all anyway, why not run them to atmosphere at the top of the RAI by extending them and extra three feet or so (90cm for the youngsters). Personally I certainly wouldn't bother to try to run them up the inside of the RAI pipe to the top, it is a lot more hassle than running them up the outside, it will restrict slightly the bore of the RAI, it will create an unnecessary hole in the RAI with the potential for leaking, all just to save having a small pipe attached to the outside of a larger pipe. |
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26th Mar 2022 10:16am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Just a thought
 I know I know it happens from time to time... Can't be helped... 
If you have a steel bodied RAI with steel baking plate, Mantec/PandP/Naka-style... Then it would not be a difficult thing to modify the system by adding a small bore steel pipe to the back of the main RAI pipe. Tacked in place so it is a tight tidy fit. Then run to the top of the RAI (terminating in either a downward facing open end or a rain-proof vent) and through the backing plate via a hollow bolt. Attach the single breather pipe from the manifold to the hollow bolt. Bob's your uncle a tidy method of getting the breathers to the top of the RAI and no risk of sucking the oil out of your axles. If I may say so myself... Its a good idea  I may even do it on MIffy |
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26th Mar 2022 2:14pm |
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