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Old 04-29-2013, 06:36 PM   #1
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Breather Tube into Exhaust


Has anyone tried exiting the breather tube into the exhaust pipe and with what results ?
If done right it would have a small savaging affect and would eliminate the need for any other device to eliminate any oil mist coming from the breather tube and getting on your toad.
To me it would make a lot of sense doing it this way which got me to wondering if anyone else has tried it ?



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Old 04-29-2013, 06:45 PM   #2
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I have a 02 discovery with a 330 cat and bought it two years ago and that is what someone did to this one welded a small exhaust pipe maybe a inch od and ran it over to by the blow by and hook the rubber hose to it I will take a pic tomorrow for u if u want have not notice any oil on toad
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Old 04-29-2013, 06:55 PM   #3
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Quote:
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I have a 02 discovery with a 330 cat and bought it two years ago and that is what someone did to this one welded a small exhaust pipe maybe a inch od and ran it over to by the blow by and hook the rubber hose to it I will take a pic tomorrow for u if u want have not notice any oil on toad
Thank you Randy for the quick response.
I can probably figure it out with just a few questions.
Does the small exhaust pipe go into the main exhaust at an angle and if you can tell, does it extend inside the exhaust pipe for a venturi effect ?
I also assume that the welded in pipe is AFTER the muffler.
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Old 04-29-2013, 08:02 PM   #4
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Wonder how the pressure on the exhaust would affect the breather tube pressure. Would the positive pressure of the exhaust have a negative effect on the crank case pressure?
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Old 04-29-2013, 08:14 PM   #5
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I should think that would kill your smog reading for any places that require that sort of annual environmental test. I have no idea if any do, that's just the first thing that came to mind.
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Old 04-29-2013, 08:19 PM   #6
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Wonder how the pressure on the exhaust would affect the breather tube pressure. Would the positive pressure of the exhaust have a negative effect on the crank case pressure?
If the tube going into the exhaust pipe AFTER the muffler, was installed projecting into the exhaust flow at an angle aimed toward the rear, you should gain a small venturi effect that would generate a slight vacuum in the breather tube.
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Old 04-29-2013, 08:37 PM   #7
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I doubt if the exhaust would be hot enough to burn the oil, so it would still come out the exhaust as oil droplets that could coat the toad. I think a collection bottle is far easier and I know it works.
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Old 04-29-2013, 08:40 PM   #8
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Chuck, the road pipes are not designed to be used under a neg pressure(vacuum). You may end up with a situation of sucking oil from the crankcase. You are correct as the connection would be needed after the muffler. Why not run the road pipe parallel the tailpipe outlet...so the road pipe vapors are just mixed into the exhaust air stream an dispersed with the exhaust after it leaves the tailpipe?
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Old 04-29-2013, 09:01 PM   #9
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Be carefull with this idea.
You could end up with a negative crankcase pressure resulting in sucking oil from the crankcase Or, you could go the other way and get a positive pressure causing oil leaks. IMHO, you would be better off using some type of catch can on the end of the OEM breather tube to catch the residue. You do not want to restrict the size or flow of the OEM breather tube.
Messing with crankcase breathers can cause headaches you don't need. If you are getting that much carry over off the breather, it is best to look into why that is happening because it is not normal.
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Old 04-30-2013, 08:50 AM   #10
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in short, it is NOT a good idea. When using differing pressures/vacuums, tread lightly.

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Old 04-30-2013, 10:21 AM   #11
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Old 04-30-2013, 10:30 AM   #12
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Technically, since you have altered the amount of emissions, you are in violation of Federal law.

What you are proposing, in essence, creates a Road Draft Tube. If the vehicle wasn't emission-certified with one, you could be tagged by the Smog Nazis.

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Old 04-30-2013, 10:53 AM   #13
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Technically, since you have altered the amount of emissions, you are in violation of Federal law.

What you are proposing, in essence, creates a Road Draft Tube. If the vehicle wasn't emission-certified with one, you could be tagged by the Smog Nazis.

Pop
If he currently has an open crankcase vent generally known as a "slobber tube" then it's not a part of an emissions system and would have zero impact on those emissions. Many diesels ran open crankcase vents until the '07 engine requirements.
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Old 04-30-2013, 08:45 PM   #14
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My exhaust is 4 inch out of the Turbo into a Arro Turbine 5050XL
Muffler
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