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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

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Old 04-09-2009, 06:40 PM   #1
Question difference and purpose of breather cap and breather filter?  
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Would someone be so kind to explain to me what the difference between a breather cap and breather filter are and the purpose for them and if is or isn't a good idea to put on a car? Thank you
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Old 04-09-2009, 06:59 PM   #2
Re: difference and purpose of breather cap and breather filter?  
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detobias is keeping our cars running
hello fellow SL owner -

a breather is a part of the PCV system which allows air to be filtered before being drawn into then through yur valve cover (VC) b4 being sucked out via the PCV valve, thus sweeping crank vapors out...

not necessary on our TDs ; our (stock TII) PCV system draws filtered air from the airbox, meeting the PCV valve at the big rubber 'tee' on the drivers back corner of the valve cover

hth - David T
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Old 04-09-2009, 11:15 PM   #3
Re: difference and purpose of breather cap and breather filter?  
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Thank you for the information, with your explanation and looking at some pictures, etc. It makes sense to me. Thanks! :)
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Old 08-07-2009, 06:13 PM   #4
Re: difference and purpose of breather cap and breather filter?  
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Okay, I'm confused. If the PCV is drawing air through the breather, what is the air filter doing? Is the car getting two seperate sources of air?

I don't have the stock air box on my car and don't have the option to put it back on (unless I comb junk yards for the parts). I do have a breather, though. So without a stock air box, is the breather absolutely vital or what?
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Old 08-07-2009, 06:29 PM   #5
Re: difference and purpose of breather cap and breather filter?  
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Works like this.
The "baffle" in the VC is supposed to separate out oil and contaminates before the PCV valve see them. When not in boost the PCV valve sucks on the VC (crankcase venting) and sends that to the intake manifold to be reburned and other wise mess up your A/F ratios.
The connection to the airbox vents the crankcase (via the three way nipple on the VC) when in boost. The turbo itself is helping pull the pressure out with it's inlet demand. The PCV valve is closed when in boost.

Without an "airbox" connection (just PCV) the crankcase has no way to vent combustion pressure ... except through weak seals. If you don't have an airbox put a separate little filter ("breather" ... k/n or such) on the end of the hose that used to go to the airbox. At least the engine can push the pressure out that way.
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Old 10-15-2009, 02:05 PM   #6
Re: difference and purpose of breather cap and breather filter?  
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Does the breather go between the pcv valve and the intake manifold by installing a tee?
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Old 10-15-2009, 04:41 PM   #7
Re: difference and purpose of breather cap and breather filter?  
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no the pvc is teed into the breather and the intake. when under vacuume the pvc vents into the intake. when under boost the pvc vents to the air box, if you dont have a air box u need to have your pvc routed to the turbo inlet just after the air filter (a 1/2" hole with a ruber gromet and a 3/8" niple fiting works fine) and the intake so the crank case gases have some were to go and not blow oil out of seals.
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Old 10-15-2009, 04:44 PM   #8
Re: difference and purpose of breather cap and breather filter?  
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Thanks for the info
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Old 10-15-2009, 04:48 PM   #9
Re: difference and purpose of breather cap and breather filter?  
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no prob the first time I read how to do it I was like wth but then I got it finger out.
some pepole say to vent the pvc to the intake and the open air but it needs some vacuume to work right so I put it in the intake tube for the turbo. It would prob be a good idea to use a cach can of some sort to keep the oil out ot the copressor housing but my brothers runs fine with out one.
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