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speedy266
Joined: 25 Jun 2003
Posts: 347
Location: Ontario, Canada
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| Posted: Sun Mar 07, 2004 3:16 pm Post subject: Crankcase Breather |
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I have an 85 3.8, heres a pic of someone that has the same engine as me
http://www.sounddomain.com/memberpage/252213/2
See the side of the valve cover it shows there it has blue thing coming out of it that bends 90 degress, it connects to the intake. Basically its sucking the hot crankcase gases back into the manifold to be reburned. Many people just put filters at the end of that, i was wanting to do that, would i be able to without any probelms. I have another pic of someone who did just that on a 1987 Buick Grand National 3.8 Turbo
http://www.downloadedskill.com/gallery/album02/DSCF0455?full=1 |
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OldsGuy
Joined: 16 Feb 2004
Posts: 269
Location: Lees Summit MO
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| Posted: Mon Mar 08, 2004 9:51 am Post subject: |
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| That is part of the positive crankcase ventilation system, it maintains a positive flow of vapors and air throughout the engine block. On V8s and V6s there are usually two, one on each valve cover, one draws filtered air from someplace like the air filter box, the other is connected to a vaccum source near the manifold. That way, one side of the engine is at a little lower pressure level than the other, which is nearer ambient pressure levels, this establishes the positive flow. If you want to remove the one you described, which sounds like the one to a vaccum source, you should plug the leak created and it may decrease the effectiveness of the pcv system, also, you might see dirtier valve covers after doing it. As to what, if any, negative effect doing that would produce, I am not sure. Maybe just a dirtier crankcase after a couple hundred thousand miles. |
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86Delta
Joined: 06 Nov 2003
Posts: 281
Location: NJ, USA
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| Posted: Mon Mar 08, 2004 3:39 pm Post subject: |
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| if you did just put a breather in the valve cover you'd have to plug the hole in the intake duct because it is after the mass air flow sensor, the engine would be sucking in more air than the sensor is registering. i would just leave it alone, because it is there for a reason. |
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73Delta88
Joined: 08 Jun 2003
Posts: 975
Location: Western Massachusetts
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| Posted: Mon Mar 08, 2004 6:47 pm Post subject: |
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| Not using the PCV system can also lead to quicker breakdown of your oil. the "blow by" gasses that enter your crank case during normal operation can do some damage if not vented out |
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c_creations
Joined: 20 Jan 2004
Posts: 205
Location: south dakota: SALTY ROAD CAPITAL :(
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| Posted: Sun Apr 09, 2006 1:26 am Post subject: |
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| Ive run into this same issue, except mine isnt a i want to remove it deal. I put a different carborater on it just to see how well the motor runs with the extra CFM nothing big, went from 670-750. They are both holley BTW. but anyways the 750 doesnt have a PCV intake plug on it, so what should be done w/ the gapping hole on the valve cover? Im going to put the other carb back on soon because i like that one better but if this problem occurs again what is to be done? |
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