Critique this PCV setup
10-10-2012, 11:08 PM
#21
In a NA application, the intake creates a vacuum and draws air out of the engine crankcase through the PCV valve. To replace the air that's drawn from the crankcase, air is sucked into the valvecover via the vent tube that's connected to the TB.
I did a test today and more air is sucked into the intake via the PCV than the amount of air that comes into the valve cover via the vent tube, meaning blowby is makes up a large portion of the air getting sucked out of the engine, even w/o boost.
http://www.ls1howto.com/howto/geniii...kpcvsystem.jpg
I did a test today and more air is sucked into the intake via the PCV than the amount of air that comes into the valve cover via the vent tube, meaning blowby is makes up a large portion of the air getting sucked out of the engine, even w/o boost.
http://www.ls1howto.com/howto/geniii...kpcvsystem.jpg
10-11-2012, 02:04 PM
#23
10-11-2012, 02:08 PM
#24
Ok, so my new plan is going to be to just put a small breather filter on the passenger side valve cover. This will let air into the crankcase in vacuum, and will let blowby out of the the crankcase in boost. Hopefully it doesn't smell to bad. The PCV line from the driver's side valve cover will go into my catch can and then out to my intake through a check valve. Simple enough.
10-11-2012, 03:06 PM
#25
Ok, so my new plan is going to be to just put a small breather filter on the passenger side valve cover. This will let air into the crankcase in vacuum, and will let blowby out of the the crankcase in boost. Hopefully it doesn't smell to bad. The PCV line from the driver's side valve cover will go into my catch can and then out to my intake through a check valve. Simple enough.
10-11-2012, 03:10 PM
#26
I had seen everyone wanting like a minimum of an -8an line off each cover to a catch can with a breather! I'd be curious who thought that was overkill, because it sounds a little ridiculous to me. I thought a single to a catch can would be enough also. Contained pressure is contained pressure, so if a single even -10an off of a valve cover should be enough I'd think.
10-11-2012, 03:27 PM
#27
-8 is 1/2" ID. I'm going to use 3/8" for the breather filter line and for the PCV/catch can lines. Out of boost this should be fine, the stock lines are 3/8" afterall. If there is still crankcase pressurization issues in boost then I might just do an oil cap breather instead. My truck valve covers only have one port on each cover, the driver's side port is the PCV port. So really I only have the passenger side port and the oil fill hole to vent out blowby when in boost.
10-11-2012, 03:50 PM
#29
Right on man, I'll be driving right by ya then! The weather sucks here too, thunderstorm here in Visalia yesterday, highway 41 was closed earlier heading to Kettleman city from here because of it and the flash flooding, they said 1-2 inches per hour rain rate, which is crazy because that whole area is like the freaking desert. Anyways... Keep me posted man and maybe one day I'll get to see the car in person!
