PCV valve do you really need it
Pro
Joined: Aug 2003
Posts: 702
Likes: 1
From: Houston TX.
Re: PCV valve do you really need it (jac1502)
They just put it there for looks. :jester
I know smart butt answer, but seriouly, the (PVC Valve) Positive Crankcase Ventilation valve is an emissions control device that routes unburned crankcase blowby gases back into the intake manifold where they can be reburned. The PCV system is one of the oldest emission control devices, and also one of the most beneficial. Besides totally eliminating crankcase emissions as a source of air pollution, the constant recirculation of air through the crankcase helps remove moisture which otherwise would cause sludge to form. Thus the PCV valve extends the life of the oil and engine. The PCV valve requires little maintenance. The valve and filter should be replaced somewhere around 30,000 to 50,000 miles (see your vehicle owners manual for service intervals).
I would keep it. The PCV valve is usually located at the end of a hose running from the air cleaner to the engine valve cover, so I would think it needs to be somewhere in this "loop", not just vacuum.
[Modified by RC73, 6:34 PM 11/6/2003]
I know smart butt answer, but seriouly, the (PVC Valve) Positive Crankcase Ventilation valve is an emissions control device that routes unburned crankcase blowby gases back into the intake manifold where they can be reburned. The PCV system is one of the oldest emission control devices, and also one of the most beneficial. Besides totally eliminating crankcase emissions as a source of air pollution, the constant recirculation of air through the crankcase helps remove moisture which otherwise would cause sludge to form. Thus the PCV valve extends the life of the oil and engine. The PCV valve requires little maintenance. The valve and filter should be replaced somewhere around 30,000 to 50,000 miles (see your vehicle owners manual for service intervals).
I would keep it. The PCV valve is usually located at the end of a hose running from the air cleaner to the engine valve cover, so I would think it needs to be somewhere in this "loop", not just vacuum.
[Modified by RC73, 6:34 PM 11/6/2003]
Thread Starter
Racer
Joined: Aug 2002
Posts: 269
Likes: 0
From: Lexington ky
Re: PCV valve do you really need it (RC73)
because i have a demon carb with the choke i have a drop base filter with no place for a tube. Any ideas on what source i should use for the vaccum?
Drifting
Joined: Aug 2002
Posts: 1,731
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From: Marietta Ga.
Re: PCV valve do you really need it (jac1502)
Here's a past thread. You can search the archives and get a lot more. http://forums.corvetteforum.com/zerothread?id=408141
:seeya
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Safety Car
Joined: Feb 1999
Posts: 3,631
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From: Fountain Hills AZ
Re: PCV valve do you really need it (jac1502)
because i have a demon carb with the choke i have a drop base filter with no place for a tube. Any ideas on what source i should use for the vaccum?
Tech Contributor
Joined: Aug 1999
Posts: 14,379
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From: At my Bar drinking and wrenching in Lafayette Colorado
Re: PCV valve do you really need it (jac1502)
You need to retain the PCV to keep a low pressure in your crankcase. This improves ring sealing and horsepower, and reduces oil consumption and oil "splatter" out of the breathers. If you don't run a PCV you have to run a crankcase vacuum pump to obtain the same effect.
The PCV does not attach to the air cleaner. The PCV is hooked up to the big 3/8" fitting in the rear of your BG baseplate. Remove one of your valvecover breathers and install a grommet with a PCV. Run the hose to the carb. Retain your other breather - it will take the place of the hose going to a stock air cleaner.
The PCV does not attach to the air cleaner. The PCV is hooked up to the big 3/8" fitting in the rear of your BG baseplate. Remove one of your valvecover breathers and install a grommet with a PCV. Run the hose to the carb. Retain your other breather - it will take the place of the hose going to a stock air cleaner.
C6 the C5 of tomorrow
Joined: Nov 2000
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From: Twin Cities Minnesota
Re: PCV valve do you really need it (lars)
:iagree:
But if you are going to use a breather with a PCV use a filtered breather, wouldn't want dirt getting sucked into the engine would we?
But if you are going to use a breather with a PCV use a filtered breather, wouldn't want dirt getting sucked into the engine would we?
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From: Tampa Bay FL
Re: PCV valve do you really need it (jac1502)
I noted your car appears to be the 80-82 body style. The hose running from the PCV valve to the carb on my '80 L48 also connects to a hose via a 3-way fitting running to the EVAP canister. I suspect it has to do with managing unburnt fuel (ie. preventing venting to atmosphere).
Thread Starter
Racer
Joined: Aug 2002
Posts: 269
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From: Lexington ky
Re: PCV valve do you really need it (TedH)
The more I read through the archives the more I have discovered the purpose and the need for the valve. But now that I have decided to run the valve, where do I get the vacuum source. I have three ports on my demon carb, one at the rear that runs the brake booster, two smaller on the passenger side, one runs advance and the other is blocked off (its small so I think to small to use), then one on my intake that runs the lights. So what do I hook the pcv valve up to? If I split the vacuum running the lights will it take too much away or do I risk using the brake booster vacuum? Thanks
Melting Slicks
Joined: Mar 2001
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From: Lake Villa IL
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St. Jude Contributor
Re: PCV valve do you really need it (jac1502)
Don't overcomplicate the issue. Really. Just take a manifold vacuum source (non ported, this provides full vacuum at idle) and attach it to the PCV. If you need to, you can buy adapters to either go up in size or down in size to match the hose to the port. Further, if you run out of vacuum ports, you can "T" off one of the ports to create more.
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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Re: PCV valve do you really need it (427V8)
Use the vacuum line that runs to the brake booster. Just pop in a TEE
I had the same problem with a Holley fuel injection.
Here is what I did. I ran the PCV to the carb base, where you are getting your power brake connection now. I then moved my power brakes to the fitting on the intake manifold using this ---
http://www.zip-products.com/Corvette...4029C586ABF4C1
See this for more info. http://forums.corvetteforum.com/zerothread?id=684189
