PCV Catch Can Setup
#21
TECH Senior Member
iTrader: (59)
How is a PCV valve not like a check valve? When there is pressure on the manifold side of the valve it will force the valve shut. When there is vacuum on the manifold side, it will throttle the amount of air flowing through the valve depending on the amount of vacuum.
#22
This is how I'm building mine, T both pcv ports together, run to vented catch can, then line from catchcan to TB with a check valve. Manifold port will be plugged. This should allow ventilation with and without boost. I'm going to make a homemade catch can with a filter on top and a drain on the bottom.
#23
TECH Fanatic
iTrader: (15)
This is how I'm building mine, T both pcv ports together, run to vented catch can, then line from catchcan to TB with a check valve. Manifold port will be plugged. This should allow ventilation with and without boost. I'm going to make a homemade catch can with a filter on top and a drain on the bottom.
It needs to be venting when idling. If you plug it at idle then you will have turbo oiling issues and white smoke from the exhaust.
#24
TECH Senior Member
iTrader: (59)
Basically I'm thinking of a stock PCV system, but put a check valve in the line that goes from the TB to the valve cover, and another check valve in the line that goes from the valve cover to the intake manifold. This will vent the engine when out of boost. Then add a breather line to the valve cover also with a check valve to let air out of the engine when in boost. Basically it would switch between the PCV system and the breather depending on if you're in or out of boost. This will also prevent unmetered air from entering the engine through the breather. Thoughts?
#25
[QUOTE=black04;4906063]If i am reading your diagram right you are going to have a vacuum leak when the check valve to the intake is open (at idle) and lets air in through the filter on the catchcan.
I never realized that, thanks. I guess I will cap off the TB as well and run the line and check valve pre turbo?
I never realized that, thanks. I guess I will cap off the TB as well and run the line and check valve pre turbo?
#26
TECH Fanatic
iTrader: (15)
Out of boost it would pull air out of the engine through the PCV system, much like stock. Then the breather will vent the engine when in boost.
Basically I'm thinking of a stock PCV system, but put a check valve in the line that goes from the TB to the valve cover, and another check valve in the line that goes from the valve cover to the intake manifold. This will vent the engine when out of boost. Then add a breather line to the valve cover also with a check valve to let air out of the engine when in boost. Basically it would switch between the PCV system and the breather depending on if you're in or out of boost. This will also prevent unmetered air from entering the engine through the breather. Thoughts?
Basically I'm thinking of a stock PCV system, but put a check valve in the line that goes from the TB to the valve cover, and another check valve in the line that goes from the valve cover to the intake manifold. This will vent the engine when out of boost. Then add a breather line to the valve cover also with a check valve to let air out of the engine when in boost. Basically it would switch between the PCV system and the breather depending on if you're in or out of boost. This will also prevent unmetered air from entering the engine through the breather. Thoughts?
It is essentially the same thing as running both valve covers to a vented catch can except you are drawing a vacuum on both lines.
#27
TECH Enthusiast
iTrader: (16)
This is how I'm building mine, T both pcv ports together, run to vented catch can, then line from catchcan to TB with a check valve. Manifold port will be plugged. This should allow ventilation with and without boost. I'm going to make a homemade catch can with a filter on top and a drain on the bottom.
this would also work if you changed the line from to TB and move it ahead of the turbo/blower and MAF if using a maf. This way it is "metered air" and not looked at as a vacuum leak.
#28
TECH Senior Member
iTrader: (59)
I could be wrong but I dont think that would be enough venting at idle. If you search through threads about people having issues with smoke at idle that is often the cause of it. I put new valve covers on my truck and forgot to unplug the passenger side vent and my garage was filled with smoke in seconds just idling.
#29
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Join Date: Nov 2011
Location: Las Vegas, NV
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ON the 2010 we just did.
Stock PCV with a one way check valve.
then pass valve cover is connected to a small filter tucked behind the water pump.
The small amount of un-metered air coming through the engine, would be compensated by your o2's while cruising. AT WOT or boosting PCV is not working so there is no un metered air.
think I typed that right. LOL
Stock PCV with a one way check valve.
then pass valve cover is connected to a small filter tucked behind the water pump.
The small amount of un-metered air coming through the engine, would be compensated by your o2's while cruising. AT WOT or boosting PCV is not working so there is no un metered air.
think I typed that right. LOL