Catch Can for PCV
Thread Starter
Drifting
Joined: Apr 2008
Posts: 1,316
Likes: 2
From: St. Louis Mo
Catch Can for PCV
For a Naturally Aspirated engine, should my Catch can have 2 ports or 1? I bought a Catch Can about a yr ago from my dyno-tuner and he installed it. I have always noticed that it has only one port.(its at the top) There s no hoses between the intake or the Throttle body and the Can either. Just hoses from the valve covers to the CatchCan. I feel like it needs another port on the Can with a hose connected to engine vacuum. Am I right? (My car is a 2001- fwiw)
Drifting
Joined: Feb 2007
Posts: 1,993
Likes: 7
From: LaPine Oregon
closed loop emissions
The positive crankcase ventilaltion (PCV) is a closed loop system. The oil catch can is installed after the PCV valve (#1 port) and the line continues from the second (#2 port) lower port to the intake manifold, throttle body, ect This for the emissions minded person.
All that you want is to incorporate the oil catch can into the closed loop system. Most here have to deal with emissions . http://eliteengineeringusa.com/Insta...uctions_CC.pdf
The oil catch you have must be vented to atmosphere. This is more performance oriented as the oil foul crankcase vapors displace the air /fuel mixture. The more blow-by the more air/fuel mixture is displaced.
In either case use the largest diameter hoses possible to help slow the oil vapors down and collect in the can.
All that you want is to incorporate the oil catch can into the closed loop system. Most here have to deal with emissions . http://eliteengineeringusa.com/Insta...uctions_CC.pdf
The oil catch you have must be vented to atmosphere. This is more performance oriented as the oil foul crankcase vapors displace the air /fuel mixture. The more blow-by the more air/fuel mixture is displaced.
In either case use the largest diameter hoses possible to help slow the oil vapors down and collect in the can.
Last edited by dieseldave56; Jul 19, 2009 at 04:24 AM. Reason: add link
Thread Starter
Drifting
Joined: Apr 2008
Posts: 1,316
Likes: 2
From: St. Louis Mo
The oil catch you have must be vented to atmosphere. This is more performance oriented as the oil foul crankcase vapors displace the air /fuel mixture. The more blow-by the more air/fuel mixture is displaced.
In either case use the largest diameter hoses possible to help slow the oil vapors down and collect in the can.
- Jason
Pro
Joined: Apr 2007
Posts: 561
Likes: 132
From: New Bern NC
I don't understand how your can could be working right with only one line on it to remove vapors from crankcase you need a second vacum line of the manifold thats why you don't get any oil in it. nothing is being drawn into it.
Thread Starter
Drifting
Joined: Apr 2008
Posts: 1,316
Likes: 2
From: St. Louis Mo
Pro
Joined: Apr 2007
Posts: 561
Likes: 132
From: New Bern NC
I have one from elite eng. on my 02 coupe has two lines one from pcv valve and one going to side of manifold and it works I do find oil in it ever oil change not much but at least it's not in the manifold.
Thread Starter
Drifting
Joined: Apr 2008
Posts: 1,316
Likes: 2
From: St. Louis Mo
One question- Does the line run into the intake or in front of the TB?(the vacuum for the cannister)
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Take a look at my procedure for installing a catch can (where I think it should be installed) in an 01 C5. It is entitled: "How to install a CP catch can in a C5 Corvette (NEW)" There are plenty of pictures that show you where the intake hookup is.
Also on this page is a paper on PCV valves and a bunch of other relevant stuff.
http://www.conceptualpolymer.com/corvette_c5_corner.htm
Dave
Also on this page is a paper on PCV valves and a bunch of other relevant stuff.
http://www.conceptualpolymer.com/corvette_c5_corner.htm
Dave
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Drifting
Joined: Feb 2007
Posts: 1,993
Likes: 7
From: LaPine Oregon
crankcase pressure
Obviously the most accepted way is to draw oil fouled air and blow-by out of the crankcase is with manifold vacuum, the combination of piston action and fresh air . But the cost is in decreased performance , ect. as the fouled air displaces air/fuel mixture , inundates the intake manifold, combustion chamber, ect. which is why the importance of an efficient oil catch can . That includes fouled air circulation, condensation ( GM engineers call this the "rain drop analysis") thru design and installation.
* read my posts on the causes of high oil consumption of the LS1 and LS6 http://forums.corvetteforum.com/c5-t...post1570223936
Last edited by dieseldave56; Jul 20, 2009 at 03:18 AM.
