pcv
6th Gear Member
Joined: Oct 2006
Posts: 6,417
From: Cork, Ireland
Some sentence that is :-)
however I'd nearly say a PCV would operate without a breather. haven't tried it, but as far as I know it only opens when there is pressure in crankcase causing the intake to pull it out. no pressure->no operation. there should never be a vacuum in the crank case. and if there is no pressure in the crank case the PCV should not open for the intake to pull. otherwise you don't have a PCV but a massive vacuum leak
Kalli
however I'd nearly say a PCV would operate without a breather. haven't tried it, but as far as I know it only opens when there is pressure in crankcase causing the intake to pull it out. no pressure->no operation. there should never be a vacuum in the crank case. and if there is no pressure in the crank case the PCV should not open for the intake to pull. otherwise you don't have a PCV but a massive vacuum leak
Kalli
4th Gear Member
Joined: Apr 2010
Posts: 1,027
From: NJ
Some sentence that is :-)
however I'd nearly say a PCV would operate without a breather. haven't tried it, but as far as I know it only opens when there is pressure in crankcase causing the intake to pull it out. no pressure->no operation. there should never be a vacuum in the crank case. and if there is no pressure in the crank case the PCV should not open for the intake to pull. otherwise you don't have a PCV but a massive vacuum leak
Kalli
however I'd nearly say a PCV would operate without a breather. haven't tried it, but as far as I know it only opens when there is pressure in crankcase causing the intake to pull it out. no pressure->no operation. there should never be a vacuum in the crank case. and if there is no pressure in the crank case the PCV should not open for the intake to pull. otherwise you don't have a PCV but a massive vacuum leak
Kalli
1st Gear Member
Joined: Jul 2007
Posts: 63
From:
I had the same problem on my 1967, I tried a couple of different brands, some worse then others. Got a Motorcraft PCV for a 1994 5.0 and the noise is gone. It is plastic and has a 90 Degree adaptor that pops off you if just want the fitting that faces up.
2nd Gear Member
Joined: Sep 2008
Posts: 469
From: The garage (near SF bay- Calif)
Some sentence that is :-)
however I'd nearly say a PCV would operate without a breather. haven't tried it, but as far as I know it only opens when there is pressure in crankcase causing the intake to pull it out. no pressure->no operation. there should never be a vacuum in the crank case. and if there is no pressure in the crank case the PCV should not open for the intake to pull. otherwise you don't have a PCV but a massive vacuum leak
Kalli
however I'd nearly say a PCV would operate without a breather. haven't tried it, but as far as I know it only opens when there is pressure in crankcase causing the intake to pull it out. no pressure->no operation. there should never be a vacuum in the crank case. and if there is no pressure in the crank case the PCV should not open for the intake to pull. otherwise you don't have a PCV but a massive vacuum leak
Kalli
If your breather has a tube connected to the air cleaner, it's considered a "closed system" because even if bad gasses back up into the air cleaner, they get sucked down the carb. It does work with just a filtered breather cap though (if the filter is not clogged).
It's a great system if it's setup right (with a breather) and it doesn't affect performance.
A detailed overview of how the PCV works and it's history is at:
http://en.wikipedia.org/wiki/PCV_valve
Last edited by 1971mach1; Apr 6, 2011 at 02:08 PM.
Thread Starter
1st Gear Member
Joined: Dec 2010
Posts: 136
From: az
jc someone told me about running one from a efi 5.0 we are stalled on the car right now as we are moving next month (just down the road) 8 miles thats it lol so wife says no more money on mustang, she is just saying drive it like it is until oct then pull it out and bore and stroke it 
btw what can a 289 be stroked out to? and bored out too? lol
btw what can a 289 be stroked out to? and bored out too? lol
Thread Starter
1st Gear Member
Joined: Dec 2010
Posts: 136
From: az
Last edited by mikenkiki05; Apr 6, 2011 at 11:00 PM. Reason: couldnt get pics to upload so i made a flicker account
2nd Gear Member
Joined: Nov 2010
Posts: 493
From: Ontario
A PCV definatly needs a breather to let in fresh air. A PCV is more of a controlled vacuum leak, not massive.
If your breather has a tube connected to the air cleaner, it's considered a "closed system" because even if bad gasses back up into the air cleaner, they get sucked down the carb. It does work with just a filtered breather cap though (if the filter is not clogged).
It's a great system if it's setup right (with a breather) and it doesn't affect performance.
A detailed overview of how the PCV works and it's history is at:
http://en.wikipedia.org/wiki/PCV_valve
If your breather has a tube connected to the air cleaner, it's considered a "closed system" because even if bad gasses back up into the air cleaner, they get sucked down the carb. It does work with just a filtered breather cap though (if the filter is not clogged).
It's a great system if it's setup right (with a breather) and it doesn't affect performance.
A detailed overview of how the PCV works and it's history is at:
http://en.wikipedia.org/wiki/PCV_valve
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