Oil in PCV/Breather
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Junior Member
Joined: Mar 2001
Posts: 28
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From: Wilmette, IL
Oil in PCV/Breather
Ok I just bought this car, and I notice that there is oil on the passenger side valve cover. I pulled out the little black 90 degree angle thing, and it's covered in oil on the inside. I think that this is the breather for the PCV system, right? Should I put a bezel in it so oil doesn't splash up in there? Also, is this bad?????
Senior Member
Joined: Apr 2000
Posts: 860
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From: Alberta, Canada
Car: 1987 IROC
Engine: Vortec 350 TPI
Transmission: 7004r
<font face="Verdana, Arial" size="2">Originally posted by bomax:
Ok I just bought this car, and I notice that there is oil on the passenger side valve cover. I pulled out the little black 90 degree angle thing, and it's covered in oil on the inside. I think that this is the breather for the PCV system, right? Should I put a bezel in it so oil doesn't splash up in there? Also, is this bad?????</font>
Ok I just bought this car, and I notice that there is oil on the passenger side valve cover. I pulled out the little black 90 degree angle thing, and it's covered in oil on the inside. I think that this is the breather for the PCV system, right? Should I put a bezel in it so oil doesn't splash up in there? Also, is this bad?????</font>
Senior Member
Joined: Jun 2000
Posts: 712
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From: Los Angeles, Ca, USA
Car: 90 Camaro RS
Engine: 305 TBI
Transmission: T56
<font face="Verdana, Arial" size="2">Originally posted by Jer82Z28:
well if there is a PCV valve there that is getting hit by oil, it could hinder breathing through the valve, perhaps even get some oil in your vaccum line and into your TBI unit or carb. pull the valve out and shake it, if it rattles its good, if it doesn't then you should buy a new one. A bezel in there would definatly help keep things cleaner</font>
well if there is a PCV valve there that is getting hit by oil, it could hinder breathing through the valve, perhaps even get some oil in your vaccum line and into your TBI unit or carb. pull the valve out and shake it, if it rattles its good, if it doesn't then you should buy a new one. A bezel in there would definatly help keep things cleaner</font>
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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 LTs, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo here...but not installed yet)
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Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!
"Just because I've done it, doesn't mean I knew what I was doing!" - Me
Senior Member
Joined: Jul 1999
Posts: 888
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From: Houston, TX
Car: '87+'02 Z28
Engine: 454 LSX
Transmission: T-56, Viper output shaft
Axle/Gears: Strage 12-bolt 3.73:1
I am having the same problem! My PCV system should be termed "OSS" for Oil Suction System 
At first I thought this was due to the baffleless Wysco valve covers I put on , so I bolted in a baffle to deflect away oil from the PCV. Result, oil still gets sucked into the PCV and then into the intake. Next , I tried adding a Moroso oil separator/breather inline w/ the PCV, still oil in the PCV!!! :MAD:
Some things I should mention, I have Total Seal Piston rings (Gapless 2nd), 383 cu. in., and the cam has a 112 deg lobe separation. There is approx. 10-12 inches of vacuum through the PCV and 15 inches of vacuum through other vacuum ports.
With these total seal rings I am forcing myself to think that the leak down is in fact around or even < than 2% as the company claims. (After I do a leak down test I'll know for sure). I am thinking that these rings generate so much positive pressure in the crank case that oil gets forced up into the valve train area as well as in the lifter valley (which would also explain a newly developing leak at the rear of the intake -which occurred while beating a supercharged mustang senseless!!!!!
)
Does anyone have any thoughts on this?
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1987 383 cu.in. IROC-Z: TPIS MiniRamIII / GM FastBurn heads / Strange 12Bolt Diff./ Neil's Home-Built BulletProof 700R4+Vigilante 2800 stall converter
MSD Billet Distributor, Dig 6+, & Blaster coil / Hooker Supercomp Long tube headers
At first I thought this was due to the baffleless Wysco valve covers I put on , so I bolted in a baffle to deflect away oil from the PCV. Result, oil still gets sucked into the PCV and then into the intake. Next , I tried adding a Moroso oil separator/breather inline w/ the PCV, still oil in the PCV!!! :MAD:Some things I should mention, I have Total Seal Piston rings (Gapless 2nd), 383 cu. in., and the cam has a 112 deg lobe separation. There is approx. 10-12 inches of vacuum through the PCV and 15 inches of vacuum through other vacuum ports.
With these total seal rings I am forcing myself to think that the leak down is in fact around or even < than 2% as the company claims. (After I do a leak down test I'll know for sure). I am thinking that these rings generate so much positive pressure in the crank case that oil gets forced up into the valve train area as well as in the lifter valley (which would also explain a newly developing leak at the rear of the intake -which occurred while beating a supercharged mustang senseless!!!!!
)Does anyone have any thoughts on this?
------------------
1987 383 cu.in. IROC-Z: TPIS MiniRamIII / GM FastBurn heads / Strange 12Bolt Diff./ Neil's Home-Built BulletProof 700R4+Vigilante 2800 stall converter
MSD Billet Distributor, Dig 6+, & Blaster coil / Hooker Supercomp Long tube headers
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