PCV/Catch Can/Breather setup
PCV/Catch Can/Breather setup I know this subject has been beaten to death in here but i just need to clarify some things. Currently I have a -12 fitting coming out of each valve cover into a breather tank. Thats it. I do not have a ls6 vally pan either, or any filter over the turbo to pull vaccum from. What are my options on a crankcase breather? would it be ok to weld a -10 or -12 fitting on the vally pan and run it to the same breather tank as my valve covers? or do i need to pull a vaccum on the vally pan by running somthing to the intake? thanks guys.
Not if you have a breather on your catch can. We run a line from each of our valve covers to one of our catch cans and its more than enough venting. Keeps any oil and mess off the covers and provides proper venting for any blowby.
You dont NEED to pull a vacuum I guess but your missing out on the benifits like improved ring seal and removing some contaminents from the oil. Your setup now will work fine(if the can is vented), if you just want venting and not PCV.
You definitely want to create vacuum in the block under load conditions for the stated reasons; ring seal and contaminant removal. Pan-vacs are a nice way of creating vacuum under load 
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i agree. mine does a great job and catches quite a bit of the condensed vapors
my main concern is with the intake pulling a vaccum on the valley cover with or without a sealed can inbetween wouldnt it still get oil vapors into the intake?
another option i was considering was to run a line from the valley cover to the downpipe with a check valve and use the exhaust to create the vaccum, or would this not work?
another option i was considering was to run a line from the valley cover to the downpipe with a check valve and use the exhaust to create the vaccum, or would this not work?
ls290, im super interested in this too, although im thinkin to add a sealed catch can , dont want the oil in my exhaust. can you provide more info on what/how etc? i had never though about this till now
The line hooked up to the intake would pull vacuum through the one way valve and sealed catch can from the valley cover. The fresh air source would be from the two valve covers vented from the catch can. Remember, a stock PCV system has a fresh air source too, at the throttle body. Under boost the one way valve closed to avoid boosting the crankcase and any positive pressure gets vented from the valve covers throught the vented catch can(has to be vented can).
i think im going to try this and see how it works....
-12 from each valve cover to breather can, take breather off of can and weld -12 bung to it and run -12 to the exhaust with a check valve, this way no oil will get to the exhaust and the crankcase will have a vaccum on it.
-12 from each valve cover to breather can, take breather off of can and weld -12 bung to it and run -12 to the exhaust with a check valve, this way no oil will get to the exhaust and the crankcase will have a vaccum on it.
The line hooked up to the intake would pull vacuum through the one way valve and sealed catch can from the valley cover. The fresh air source would be from the two valve covers vented from the catch can. Remember, a stock PCV system has a fresh air source too, at the throttle body. Under boost the one way valve closed to avoid boosting the crankcase and any positive pressure gets vented from the valve covers throught the vented catch can(has to be vented can).
Id like to know how the exhaust scavenge system works ok, great idea.
iknow, diggin lol but i have too
]So just to make sure,
i want this setup right? even if i run a rear mounted turbo setup?
I already have a catch can and check valve with an LS6 valley cover right now. IT would be advisable to run a vac line all the way back to the turbo compressor inlet source? just checking ot make sure.
]So just to make sure,
i want this setup right? even if i run a rear mounted turbo setup?
I already have a catch can and check valve with an LS6 valley cover right now. IT would be advisable to run a vac line all the way back to the turbo compressor inlet source? just checking ot make sure.