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Re: Do I have to run a pcv
[Re: 1BAD68]
#1322044
10/19/12 09:36 AM
10/19/12 09:36 AM
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Joined: Apr 2005
Posts: 4,923
new berlin wisconsin
Mr T2U
master
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master
Joined: Apr 2005
Posts: 4,923
new berlin wisconsin
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i have a 572 hemi.
i use cast breathers bolted to cast mopar valve covers. i have a single plane intake and the valve covers really aren't set up for pcv valves, so using a pcv system gets complicated.
i run a 10 or 12an, can't remember which, braided line line from the breather to the bottom of the air cleaner. seems to work ok.
if i used baffle in the valve cover i would get less oil thru the breathers. the only problem is there isn't enough room in the valve cover for that.
Last edited by Mr T2U; 10/19/12 09:54 AM.
perception is 90% of reality
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Re: Do I have to run a pcv
[Re: Cab_Burge]
#1322046
10/19/12 01:59 PM
10/19/12 01:59 PM
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Joined: Jan 2007
Posts: 891
wisconsin
1BAD68
super stock
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super stock
Joined: Jan 2007
Posts: 891
wisconsin
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Edit:
At idle the PCV is forced open from vacuum.
At high rpm's, the PCV closes.
Still don't know if it's a spring that closes it?
Last edited by 1BAD68; 10/19/12 03:51 PM.
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Re: Do I have to run a pcv
[Re: 1BAD68]
#1322047
10/19/12 02:24 PM
10/19/12 02:24 PM
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Joined: Jun 2005
Posts: 5,107
Western Md.
skicker
"The Champ"
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"The Champ"
Joined: Jun 2005
Posts: 5,107
Western Md.
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I put about 5,ooo miles or so on my 383 and always had a oil pushing out the breather and trying to leak around the ends of the intake. I'm running an old set of MT valve covers that had no hole for a pcv. After pushing a valve cover gasket out a few weeks back I drilled the v/c for a pcv. END OF PROBLEMS! I never ran one before on aftermarket v/c's but from now on I'm not running without one.
Yeh Mike...I know if I would've listened to you....
...FAFO...
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Re: Do I have to run a pcv
[Re: skicker]
#1322048
10/19/12 03:43 PM
10/19/12 03:43 PM
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Joined: Jan 2003
Posts: 21,076
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
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They suck at idle.Pull one and see.As for pushing out a cover gasket you need a rebuild or better gaskets.Our cars get the h--l beat on them and I know the 62 with 50K has never been reringed etc.No problems ever.Rocky
Chrysler Firepower
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Re: Do I have to run a pcv
[Re: Cab_Burge]
#1322049
10/19/12 04:03 PM
10/19/12 04:03 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
Quote:
I'm pretty sure it's closed at idle, otherwise it would act like a big vacuum leak.
That is real easy to check, start your motor up, pull the PCV out and put your finger over the hole in the bottom of the PCV and let us know if your motor speeds up or slows down blocking the PCV  Let us know your results 
Of course it's going to speed up. It's a vacuum leak at idle. Most of them have an orfice to leak at idle regardless of vacuum.
Pull the pcv from cover, hook up a vacuum gauge to another port and observe what the gauge does when the pcv is attached, attached and covered and completely unplugged. Those observations should get you in the area of how it works and whether it's closed or open at high/idle vacuum situations.
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Re: Do I have to run a pcv
[Re: RobX4406]
#1322050
10/19/12 07:57 PM
10/19/12 07:57 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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PCV Valves are open at idle. One set of ring seal is to idle the engine, pull the breather and see if a piece of paper will get sucked down in the open hole by vacuum (obviously you have the PCV in place for this test).
If it doesn't get pulled down and seal the hole, or worse yet you see exhaust pulsing out the hole you have ring seal issues.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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