PCV valve, valve covers
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Newbie
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PCV valve, valve covers
Hi i searched a lil about this and didnt really find much, but was wondering. Im building a sb 350 and want to know if i should put completely sealed valve covers on or valve covers with just breathers or use the pcv valve covers like original. whats the difference and pro's and con's to these diff. setups. Any help is much appreciated
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From: The 'Burbs of Chicago
RE: PCV valve, valve covers
Use a PCV valve in one cover, and a vented cap in the other, here's why. Obviously the crankcase needs to breath to displace the air as the pistons move up and down. The PCV valve is hooked up to your intake, and the pressureisSUCKED out of the crankcase (which is better on the engine), instead of it having to be BLOWN out of the crankcase. The vented cap on the other valve cover lets the air in (or more out ifneeded).
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Joined: May 2003
Posts: 293
From: San Bernardino,Ca
RE: PCV valve, valve covers
ORIGINAL: Camaro 69
Use a PCV valve in one cover, and a vented cap in the other, here's why. Obviously the crankcase needs to breath to displace the air as the pistons move up and down. The PCV valve is hooked up to your intake, and the pressureisSUCKED out of the crankcase (which is better on the engine), instead of it having to be BLOWN out of the crankcase. The vented cap on the other valve cover lets the air in (or more out ifneeded).
Use a PCV valve in one cover, and a vented cap in the other, here's why. Obviously the crankcase needs to breath to displace the air as the pistons move up and down. The PCV valve is hooked up to your intake, and the pressureisSUCKED out of the crankcase (which is better on the engine), instead of it having to be BLOWN out of the crankcase. The vented cap on the other valve cover lets the air in (or more out ifneeded).
This is how the Factory does it. It has a hose that goes from the valve cover to the air cleaner base with a filter element in there, so it will suck in filtered air.
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From: The 'Burbs of Chicago
RE: PCV valve, valve covers
ORIGINAL: firebird69racer
This is how the Factory does it. It has a hose that goes from the valve cover to the air cleaner base with a filter element in there, so it will suck in filtered air.
ORIGINAL: Camaro 69
Use a PCV valve in one cover, and a vented cap in the other, here's why. Obviously the crankcase needs to breath to displace the air as the pistons move up and down. The PCV valve is hooked up to your intake, and the pressureisSUCKED out of the crankcase (which is better on the engine), instead of it having to be BLOWN out of the crankcase. The vented cap on the other valve cover lets the air in (or more out ifneeded).
Use a PCV valve in one cover, and a vented cap in the other, here's why. Obviously the crankcase needs to breath to displace the air as the pistons move up and down. The PCV valve is hooked up to your intake, and the pressureisSUCKED out of the crankcase (which is better on the engine), instead of it having to be BLOWN out of the crankcase. The vented cap on the other valve cover lets the air in (or more out ifneeded).
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Joined: Feb 2008
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RE: PCV valve, valve covers
ok sweet thnx for the help. one thing though why do scott shafiroff's mtrs and some of these sick drag cars have sealed fabricated valve covers? this is gonna be between a 450 and 500 horse mtr
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Joined: May 2003
Posts: 293
From: San Bernardino,Ca
RE: PCV valve, valve covers
ORIGINAL: 79camaro505
ok sweet thnx for the help. one thing though why do scott shafiroff's mtrs and some of these sick drag cars have sealed fabricated valve covers? this is gonna be between a 450 and 500 horse mtr
ok sweet thnx for the help. one thing though why do scott shafiroff's mtrs and some of these sick drag cars have sealed fabricated valve covers? this is gonna be between a 450 and 500 horse mtr
If you look real close or if you ask them. They are running a vacuum pump of some sort to create a vacuum in the motor. In the older days they would run a hose with a one way valve to the collector on the headers to suck out the fumes in the motor. But now most use a vacuum pump.
For what you are doing the PCV valve would be just fine
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