Catch can Q
Thread Starter
Former Vendor
Joined: Apr 2007
Posts: 1,331
Likes: 4
From: Jacksonville Florida
Catch can Q
hello,
i recently installed a catch can on my 97 LS1, looking at different sets of instructions, some say PCV valve before the can, some say valve after the can, which way is right, or does it matter?
i recently installed a catch can on my 97 LS1, looking at different sets of instructions, some say PCV valve before the can, some say valve after the can, which way is right, or does it matter?
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Your PCV valve needs some lubrication, so always position the catch can after the PCV. Check here for more info:
http://www.conceptualpolymer.com/PCV...oval%20101.pdf
http://www.conceptualpolymer.com/PCV...oval%20101.pdf
Drifting
Joined: Feb 2007
Posts: 1,993
Likes: 7
From: LaPine Oregon
A picture is worth ........
I agree with Dave that the can goes after the PVC valve. But here's some install instructions from Elite Engineering http://www.eliteengineeringusa.com/I...uctions_CC.pdf
Last edited by dieseldave56; Jul 25, 2007 at 02:15 AM.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
I agree with Dave that the can goes after the PVC valve. But here's some install instructions from Elite Engineering.
http://www.eliteengineeringusa.com/I...uctions_CC.pdf
http://www.eliteengineeringusa.com/I...uctions_CC.pdf
As you can see in the Elite Engineering instructions, the placement of the PCV valve depend on if it's an LS1 or LS6.
Team Owner
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I don't think it really matters much if the PCV valve is before or after. Even if it was after the catch can, there will still be some slight oil mist in the vapors as no catch can will separate 100% of the oil out of the crankcase vapors.
As you can see in the Elite Engineering instructions, the placement of the PCV valve depend on if it's an LS1 or LS6.
As you can see in the Elite Engineering instructions, the placement of the PCV valve depend on if it's an LS1 or LS6.
I changed my '99 pcv system over to a Z06 style when I did my Z06 intake manifold install a couple years back. I also installed my AMW can on the inside of the R/F frame rails (tilted back about 30-40 degrees).
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
On the 2004 and on LS1/LS6/LS2 motors it doesn't matter because the "PCV Valve" is really not a valve, but a 2 mm hole in the tube of the valley cover hose nipple.
Race Director
Joined: Dec 2000
Posts: 19,304
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From: San Diego CA
This is true for the applications ZeeO listed. However, the majority of C5s have a traditional PCV "valve" and since the originator has a 97, the can should me mounted downstream of the PCV valve. While it is true oil aerosols will easily get past a common catch can, a true coalescing filter that is sized correctly will trap more of the airborn oil, due to the much-higher density of its filter element.
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