PCV valve,can I remove?
Le Mans Master
Joined: Nov 1999
Posts: 5,768
Likes: 3
From: San Diego CA
3 pages on PVC kills me...
I have one, and a carb - lets talk about how jacked up my paint is here...
I have one, and a carb - lets talk about how jacked up my paint is here...
3 pages on Polyvinyl chloride? really where?
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
I had a '65 Corvette with an L79. These engines were designed with a blowby tube on the back of the intake manifold and a rubber hose than hung down the back of the engine.
Made quite a mess on the underside of the car and even dripped oil on the pavement.
As we all know, oil, especially used oil, is not good for the ground and lord knows we get enough of it everywhere anyway.
Golden, I have to tell you that maybe one little car or even a few race cars won't make any difference but billions of them blowing used oil all over the place will absolutely have an effect. And over time the effect is compounded.
Removing the PCV is not unlike what Bubba does with most things. If he doesn't understand it and he 'cain't figger it out' he disables it.
Geez, a little valve that ensures the crankcase has room for fresh air by removing the nasty stuff already in there...what's the big deal. It's not a conspiracy for crying out loud.
People always ripped the A.I.R. pumps off too thinking they robbed them of horse power. Yes, they are parasitic because of the belt but that's about it. They just pump fresh air into the exhaust manifolds. No power robbing there. It's all downstream of the combustion process.
Good grief.
Made quite a mess on the underside of the car and even dripped oil on the pavement.
As we all know, oil, especially used oil, is not good for the ground and lord knows we get enough of it everywhere anyway.
Golden, I have to tell you that maybe one little car or even a few race cars won't make any difference but billions of them blowing used oil all over the place will absolutely have an effect. And over time the effect is compounded.
Removing the PCV is not unlike what Bubba does with most things. If he doesn't understand it and he 'cain't figger it out' he disables it.
Geez, a little valve that ensures the crankcase has room for fresh air by removing the nasty stuff already in there...what's the big deal. It's not a conspiracy for crying out loud.
People always ripped the A.I.R. pumps off too thinking they robbed them of horse power. Yes, they are parasitic because of the belt but that's about it. They just pump fresh air into the exhaust manifolds. No power robbing there. It's all downstream of the combustion process.
Good grief.
Pro
Joined: May 2003
Posts: 593
Likes: 0
From: London England
People always ripped the A.I.R. pumps off too thinking they robbed them of horse power. Yes, they are parasitic because of the belt but that's about it. They just pump fresh air into the exhaust manifolds. No power robbing there. It's all downstream of the combustion process.
Good grief.
Good grief.
Before you start posting pompous replies I suggest you know what you're talking about.
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
The latter is really beginning to shine...
Last edited by Avette4me; Dec 16, 2009 at 06:56 PM.
Pro
Joined: May 2003
Posts: 593
Likes: 0
From: London England
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Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Burning Brakes
Joined: Dec 2007
Posts: 952
Likes: 0
Are you suggesting I'm some kind of ignorant simpleton that doesn't understand what they're doing?
You clearly either haven't read the thread or have no grasp what so ever of what PCV is and it's implications.
WHAT! air pumps rob power to run, cause turbulence in the headers, raises manifold temperature, compounding the turbulence, reducing cylinder scavenging, lowering cylinder VE.
Before you start posting pompous replies I suggest you know what you're talking about.
You clearly either haven't read the thread or have no grasp what so ever of what PCV is and it's implications.
WHAT! air pumps rob power to run, cause turbulence in the headers, raises manifold temperature, compounding the turbulence, reducing cylinder scavenging, lowering cylinder VE.
Before you start posting pompous replies I suggest you know what you're talking about.
Burning Brakes
Joined: Dec 2007
Posts: 952
Likes: 0
Golden, let me try this another way. I can't wait to read your response. Blowby is simply the transference of gases from the "right" side of the rings, to the "wrong" side of the rings. A PCV merely takes the gases from the "wrong" side of the rings, and places them back into the "right" side.
If the escaped gases originate in the "right" side in the first place, what "harm" will they do the second time thru?
If the escaped gases originate in the "right" side in the first place, what "harm" will they do the second time thru?
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
The thing I have against using breathers in the valve covers is that it forces the crankcase to use the same pathway for pressure release that was designed as an oil return from the rockers so you already have oil in the path and the built up pressure pushes it back up toward the breather.
Not very efficient. The PCV valve uses one valve cover to vent pressure to the combustion chamber via the carburetor and the other to pull in fresh filtered air to replace it.
Given the above scenario you have increased the oil return capacity by up to 50% while providing a positive relief for internal pressure from the crankcase.
This also increases the life of the oil by removing the contaminants in blowby from the crankcase.
I have not seen a down side to the PCV system at all when used and maintained as designed.
If you are concerned about oil in the intake manifold, GM makes a product called Top Engine Cleaner you might consider using every so often. It was made specifically to clean out the intake.
cc
Not very efficient. The PCV valve uses one valve cover to vent pressure to the combustion chamber via the carburetor and the other to pull in fresh filtered air to replace it.
Given the above scenario you have increased the oil return capacity by up to 50% while providing a positive relief for internal pressure from the crankcase.
This also increases the life of the oil by removing the contaminants in blowby from the crankcase.
I have not seen a down side to the PCV system at all when used and maintained as designed.
If you are concerned about oil in the intake manifold, GM makes a product called Top Engine Cleaner you might consider using every so often. It was made specifically to clean out the intake.
cc
Pro
Joined: May 2003
Posts: 593
Likes: 0
From: London England
McLaren F1 Team
Mercedes F1 Team
Redbull Racing F1 Team
Williams F1 Team
Force India F1 Team
Lotus F1 Team
Virgin F1 Team
Frederick William Lanchester inventor of disc brakes.
Herbert Akroyd-Stuart inventor of fuel injection.
Butler inventor of the venturi carburettor.
Maybe some names you've heard of.
Lola
Raynard
G-Force
Ilmor
Cosworth
Pro
Joined: May 2003
Posts: 593
Likes: 0
From: London England
The thing I have against using breathers in the valve covers is that it forces the crankcase to use the same pathway for pressure release that was designed as an oil return from the rockers so you already have oil in the path and the built up pressure pushes it back up toward the breather.
Not very efficient. The PCV valve uses one valve cover to vent pressure to the combustion chamber via the carburetor and the other to pull in fresh filtered air to replace it.
Given the above scenario you have increased the oil return capacity by up to 50% while providing a positive relief for internal pressure from the crankcase.
Not very efficient. The PCV valve uses one valve cover to vent pressure to the combustion chamber via the carburetor and the other to pull in fresh filtered air to replace it.
Given the above scenario you have increased the oil return capacity by up to 50% while providing a positive relief for internal pressure from the crankcase.
Also let me remind you again that many more modern engines do not have PCV just a closed breather system. If oil and crankcase contamination was such an issue don't you think all manufacturers would use PCV?
Some of you really need to join this millennia.
Burning Brakes
Joined: Dec 2007
Posts: 952
Likes: 0
What do all these things have in common.
McLaren F1 Team
Mercedes F1 Team
Redbull Racing F1 Team
Williams F1 Team
Force India F1 Team
Lotus F1 Team
Virgin F1 Team
Frederick William Lanchester inventor of disc brakes.
Herbert Akroyd-Stuart inventor of fuel injection.
Butler inventor of the venturi carburettor.
Maybe some names you've heard of.
Lola
Raynard
G-Force
Ilmor
Cosworth
McLaren F1 Team
Mercedes F1 Team
Redbull Racing F1 Team
Williams F1 Team
Force India F1 Team
Lotus F1 Team
Virgin F1 Team
Frederick William Lanchester inventor of disc brakes.
Herbert Akroyd-Stuart inventor of fuel injection.
Butler inventor of the venturi carburettor.
Maybe some names you've heard of.
Lola
Raynard
G-Force
Ilmor
Cosworth