What's the PCV Value do?
Retired MF Moderator
Joined: Apr 2004
Posts: 7,156
From: I live in Canada, eh
RE: What's the PCV Value do?
ORIGINAL: Chopper
PCV's were installed to allow the engine to burn all the stuff that was previously allowed to escape into the atmosphere.The old cars had a simple fiber and baffle filled cap that also doubled as the oil fill cap.These would eventually fill up with oil and start leaking oil all over the valve covers,and eventually onto the ground.Oil and unburned gas vapors would also get out into the air and this is what the EPA wanted Detroit to eliminate.
The PCV system is used to allow filtered air into the engine with the purpose of carrying unburned gasoline and oil vapors into the engine to be burned thereby saving the Earth for future generations.There is one hose going from the intake tube into the drivers side cam cover and a vacuum hose going from the passenger side cam cover to the upper plenum.The PCV is where the vacuum hose goes into the cam cover.
If the PCV is removed the unburned vapors will still find their way to the intake tube but it will be through the T/B and plenum.This will eventually cause a build up of some of the hardest to remove gom you have ever seen on everything (including the MAF) in the engine.
If the engine is sealed completly with no way for gasses and vapors to get out the result will be popped gaskets and severe leaks.Performance will suffer because there will be a pressure build up under the pistons holding them back against combustion pressure.One thing is sure,this is one problem that won't last for very long.
ORIGINAL: 03YellowPony
+1. No it's NOT for emissions. It's a pressure relief valve. Before they had PCV's, engines had a tube that dumped the excess pressure out of the engine all together.
ORIGINAL: myshifter
the main function of the PCV is to ventilate the pressure that is built up inside the engine, if you run no pcv you will find that pressure has to go somewhere and next thing you know, your valve covers will be leaking, oil pan leaking. The pressure will find the path of least resistance and thats the gaskets.
the main function of the PCV is to ventilate the pressure that is built up inside the engine, if you run no pcv you will find that pressure has to go somewhere and next thing you know, your valve covers will be leaking, oil pan leaking. The pressure will find the path of least resistance and thats the gaskets.
The PCV system is used to allow filtered air into the engine with the purpose of carrying unburned gasoline and oil vapors into the engine to be burned thereby saving the Earth for future generations.There is one hose going from the intake tube into the drivers side cam cover and a vacuum hose going from the passenger side cam cover to the upper plenum.The PCV is where the vacuum hose goes into the cam cover.
If the PCV is removed the unburned vapors will still find their way to the intake tube but it will be through the T/B and plenum.This will eventually cause a build up of some of the hardest to remove gom you have ever seen on everything (including the MAF) in the engine.
If the engine is sealed completly with no way for gasses and vapors to get out the result will be popped gaskets and severe leaks.Performance will suffer because there will be a pressure build up under the pistons holding them back against combustion pressure.One thing is sure,this is one problem that won't last for very long.
2nd Gear Member
Joined: Oct 2004
Posts: 197
From:
RE: What's the PCV Value do?
chopper usually has very good posts...
i use a breather catch can so it catchs the oil but still vents to air.
kinda hard to see but its mounted on the power steering bracket
[IMG]local://upfiles/9837/FA451502851B4F018A4EC5C4C45E00A6.jpg[/IMG]
i use a breather catch can so it catchs the oil but still vents to air.
kinda hard to see but its mounted on the power steering bracket
[IMG]local://upfiles/9837/FA451502851B4F018A4EC5C4C45E00A6.jpg[/IMG]
Retired MF Moderator
Joined: Apr 2004
Posts: 7,156
From: I live in Canada, eh
RE: What's the PCV Value do?
ORIGINAL: pdk
chopper usually has very good posts...
i use a breather catch can so it catchs the oil but still vents to air.
kinda hard to see but its mounted on the power steering bracket
[IMG]local://upfiles/9837/FA451502851B4F018A4EC5C4C45E00A6.jpg[/IMG]
chopper usually has very good posts...
i use a breather catch can so it catchs the oil but still vents to air.
kinda hard to see but its mounted on the power steering bracket
[IMG]local://upfiles/9837/FA451502851B4F018A4EC5C4C45E00A6.jpg[/IMG]
He sure does.
Looks like you know a thing or two by that engine pic. How much boost are you running? Is that the stock motor with valve covers or are you hiding some massive cams under there...they look kinda tall?
2nd Gear Member
Joined: Oct 2004
Posts: 197
From:
RE: What's the PCV Value do?
bout the only thing i know is where to sign the check.
most mod were put on in a shop. i can do minor things myself but nothing i could screw up really bad
overview
7psi p1sc, 9.5cr forged s/b by FPS, vt stg2blwr cam, patriotstg2 heads, cobra tank/pumps + BAP, mcleod clutch, stock tranny...447rhp/420rtq preforged
most mod were put on in a shop. i can do minor things myself but nothing i could screw up really bad
overview
7psi p1sc, 9.5cr forged s/b by FPS, vt stg2blwr cam, patriotstg2 heads, cobra tank/pumps + BAP, mcleod clutch, stock tranny...447rhp/420rtq preforged
Retired MF Moderator
Joined: Apr 2004
Posts: 7,156
From: I live in Canada, eh
RE: What's the PCV Value do?
ORIGINAL: pdk
bout the only thing i know is where to sign the check.
most mod were put on in a shop. i can do minor things myself but nothing i could screw up really bad
overview
7psi p1sc, 9.5cr forged s/b by FPS, vt stg2blwr cam, patriotstg2 heads, cobra tank/pumps + BAP, mcleod clutch, stock tranny...447rhp/420rtq preforged
bout the only thing i know is where to sign the check.
most mod were put on in a shop. i can do minor things myself but nothing i could screw up really bad
overview
7psi p1sc, 9.5cr forged s/b by FPS, vt stg2blwr cam, patriotstg2 heads, cobra tank/pumps + BAP, mcleod clutch, stock tranny...447rhp/420rtq preforged
You run it on the track at all?
2nd Gear Member
Joined: Oct 2004
Posts: 197
From:
RE: What's the PCV Value do?
sort of...thats how i got the forged motor
its a long story ill try to keep it sweet
12.3 w/ just the blower and slicks (forgot mph)
upgraded heads/cam
dynoed 447/420
threw rod on first real pass trying to get times
forged motor
HRP (track) now closed
at least i drive it on the street its not too big a problem
its a long story ill try to keep it sweet
12.3 w/ just the blower and slicks (forgot mph)
upgraded heads/cam
dynoed 447/420
threw rod on first real pass trying to get times
forged motor
HRP (track) now closed
at least i drive it on the street its not too big a problem
5th Gear Member
Joined: Apr 2006
Posts: 3,625
RE: What's the PCV Value do?
ORIGINAL: 03YellowPony
+1. No it's NOT for emissions. It's a pressure relief valve. Before they had PCV's, engines had a tube that dumped the excess pressure out of the engine all together.
ORIGINAL: myshifter
the main function of the PCV is to ventilate the pressure that is built up inside the engine, if you run no pcv you will find that pressure has to go somewhere and next thing you know, your valve covers will be leaking, oil pan leaking. The pressure will find the path of least resistance and thats the gaskets.
the main function of the PCV is to ventilate the pressure that is built up inside the engine, if you run no pcv you will find that pressure has to go somewhere and next thing you know, your valve covers will be leaking, oil pan leaking. The pressure will find the path of least resistance and thats the gaskets.
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