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Old 12-16-2008, 08:21 PM   #1 (permalink)
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Valve Cover breather spits oil

Ok guys here is the problem I need help with. On my motor I have a set of Ford Racing valve covers with push in breathers. The thing is during hard acelerationthe breathers spit oil. Even with the valve cover baffels in place
it spits the oil out. The breathers are also the kind that have a shield to keep oil in the valve covers. So if anyone can help me get rid of this oil spill I will apreciate it. (no pcv valve other than the one behind the EFI intake manifold)
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Old 12-16-2008, 09:01 PM   #2 (permalink)
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Re: Valve Cover breather spits oil

I had the same set up with my 347.......2 breathers. No PCV. It would only blow oil out the breather and dipstick........all over the front of my engine. I finally have 1 breather and a PCV on the other valve cover. Problem went away. No more oil pushing out the breathers. I found out that you have to have something sucking the exhaust gases out or it will find it's way out.....by either the rear main seal or the breathers.
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Last edited by Spali32; 12-16-2008 at 09:06 PM.
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Old 12-16-2008, 09:16 PM   #3 (permalink)
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Re: Valve Cover breather spits oil

So you are suggesting i get a pcv set up for my valve covers huh?Maybe breathers with pcv and connections to vacume line.What breathers did you get or which breathers you recomend? Im all ears....
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Old 12-16-2008, 11:26 PM   #4 (permalink)
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Re: Valve Cover breather spits oil

Yep, one breather on driver's side and a PCV on the passenger side. Any breather will do, you just have to have a PCV valve to help suck the exhaust gases out of your engine. Otherwise you will continue to push the oil out both breathers and/or the rear main seal. Try it......I think you'll be surprised on how well it will work for ya.
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Old 12-18-2008, 09:28 AM   #5 (permalink)
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Re: Valve Cover breather spits oil

Quote:
Originally Posted by Spali32 View Post
Yep, one breather on driver's side and a PCV on the passenger side. Any breather will do, you just have to have a PCV valve to help suck the exhaust gases out of your engine. Otherwise you will continue to push the oil out both breathers and/or the rear main seal. Try it......I think you'll be surprised on how well it will work for ya.


One other thing I forgot to mention.Back when i installed the intake manifold
I fabricated a aluminum plate,sorta like a baffle for the rear of the intake manifold. So that plate resides on the underside of the intake covering the the whole where the pcv and vacume hose connect. It does not completly
plug the hole and does have a gap to breath , about 1/4 inch. Maybe less.
That might be another cause to make it spitt right?
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Old 12-18-2008, 10:45 AM   #6 (permalink)
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Re: Valve Cover breather spits oil

It's spitting oil since the exhaust gases have nowhere else to go. By plumbing in a PCV set up your sucking out the exhaust gases via vacuum.
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Old 12-18-2008, 07:13 PM   #7 (permalink)
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Re: Valve Cover breather spits oil

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It's spitting oil since the exhaust gases have nowhere else to go. By plumbing in a PCV set up your sucking out the exhaust gases via vacuum.

Cool. I started putting my Stang back together today. Hopefully be done by tomorrow and head out to Houston Raceway Park. Thanks for the intell.
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Old 12-18-2008, 10:54 PM   #8 (permalink)
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Re: Valve Cover breather spits oil

Let us know how it worked out for ya. I know it did the same thing on mine, hooked up the PCV system correctly and my pushing oil out issues went away.
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Old 12-19-2008, 08:22 AM   #9 (permalink)
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Re: Valve Cover breather spits oil

Alot of guys are also running some other type of system like a header evac system or an electric/mechanical vacuum pump....Sometimes a PCV is not enough..
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Old 12-19-2008, 09:08 AM   #10 (permalink)
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Re: Valve Cover breather spits oil

Along the same lines....Can you hook up a header type evac system to a small block with around 350 horse? Or would that be too little horsepower for a system like the header type evac? Would the carb perform better not pulling hot air from the crankcase?
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Old 12-19-2008, 02:08 PM   #11 (permalink)
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Re: Valve Cover breather spits oil

I just use an evac system on my street car.

You can see the tubes with the anti-backfire valves on the pipes.




Just run hoses from those valves to the breather caps on the valve covers. I think you can make out the hoses going to the breather cap on each valve cover in the picture. I took the baffles out of the valve covers for rocker clearance and it still works well.




The evac system works fine with straight through mufflers like the Hooker Max Flows. It works fine even with the evac tubes a couple of feet behind the headers.
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