Is PCV port beneficial?
Thread Starter
Staging Lane
Joined: Oct 2015
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Is PCV port beneficial? If the stock valve covers on an LS3 are removed and replaced with fabricated aluminum, the PCV port on the PS valve cover is gone. When asked if this is ok, the typical response is that the LS6 valley cover works well. So 2 questions - is the valley cover on the LS3 the same as LS6? And is it ok to run a valve cover on the LS3 without a PCV port?
I think you have posted in the wrong section. But, to answer your question. Every engine has to vent. A PCV system is a combination of breather, allowing metered air in, and a vacuum, taking the metered air out and passing it into the intake. This decreases pressure that will be generated in the crankcase.
A simple PCV system may be just a tube from somewhere on the crankcase to a catch can, that allows the pressure to vent. If you seal the engine completely, you will push the dipstick out, and blow oil all over your engine bay.
A simple PCV system may be just a tube from somewhere on the crankcase to a catch can, that allows the pressure to vent. If you seal the engine completely, you will push the dipstick out, and blow oil all over your engine bay.
Thread Starter
Staging Lane
Joined: Oct 2015
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Thank you for your reply Casias. Could you recommend the section I should be posting this in? I'm comfortable with the operation of the PCV system. My question is related to the valley cover. Are the LS6 and LS3 the same? If not, what difference remains in their contribution to the venting of the engine? Many have said the valley cover venting system on the LS6 is sufficient without another vent on the valve covers. So would this be the same for the LS3?
As long as the valley cover you are using has a baffled vent, and you place it to vacuum, it will be fine. But if you get rid of the valve covers and replace them with aftermarket, you will have to find a baffled port for the breather side. Air in, air out.
You may want to post this in the Gen IV area, to see what people do when they use aftermarket valve covers.
You may want to post this in the Gen IV area, to see what people do when they use aftermarket valve covers.
The PS port is for fresh air in and the valley cover contaminated gases out so yes it makes a difference. You would need to find another access point for the fresh air.
Thread Starter
Staging Lane
Joined: Oct 2015
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Ok. Thanks. Makes sense. One other concern I've thought of since then. A port can easily be added to the new valve cover for fresh air to be plumbed in but is there a great chance that oil in the valve covers could travel back up the port? Would it be necessary to have a shield fabricated over the inside of the port (inside the valve cover) once installed?
mr08353, unless you have excessive blow-by past the rings you should have little to no oil being pushed out the fresh air inlet/s; even with having oil no baffles in your valve covers. I run a +04 ls6 valley cover along with aftermarket valve covers that have no baffles, and a fresh air inlets into both of them without having any issues with oil in the throttle body fresh air port.
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Staging Lane
Joined: Oct 2015
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mr08353, unless you have excessive blow-by past the rings you should have little to no oil being pushed out the fresh air inlet/s; even with having oil no baffles in your valve covers. I run a +04 ls6 valley cover along with aftermarket valve covers that have no baffles, and a fresh air inlets into both of them without having any issues with oil in the throttle body fresh air port.
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Staging Lane
Joined: Oct 2015
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Yessir. It's a big piece of metal. I was calling it a shield. So this is the question. Is that baffle necessary? I'm going to add this port to the new valve cover but will everything work ok if I don't add the baffle on the inside? What would be the consequences if baffle was left off?
Thread Starter
Staging Lane
Joined: Oct 2015
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Yessir. It's a big piece of metal. I was calling it a shield. So this is the question. Is that baffle necessary? I'm going to add this port to the new valve cover but will everything work ok if I don't add the baffle on the inside? What would be the consequences if baffle was left off?
Thread Starter
Staging Lane
Joined: Oct 2015
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