pcv
04-06-2011, 11:28 AM
#11
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
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
04-06-2011, 11:33 AM
#12
4th Gear Member
Join Date: Apr 2010
Location: NJ
Posts: 1,027
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
04-06-2011, 12:55 PM
#13
1st Gear Member
Join Date: Jul 2007
Location:
Posts: 63
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.
04-06-2011, 01:55 PM
#14
2nd Gear Member
Join Date: Sep 2008
Location: The garage (near SF bay- Calif)
Posts: 469
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; 04-06-2011 at 02:08 PM.
04-06-2011, 10:26 PM
#15
1st Gear Member
Thread Starter
Join Date: Dec 2010
Location: az
Posts: 136
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
04-06-2011, 10:56 PM
#16
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Thread Starter
Join Date: Dec 2010
Location: az
Posts: 136
Last edited by mikenkiki05; 04-06-2011 at 11:00 PM. Reason: couldnt get pics to upload so i made a flicker account
04-07-2011, 11:45 AM
#18
2nd Gear Member
Join Date: Nov 2010
Location: Ontario
Posts: 493
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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