In my Search for catch can info. I came across this.

[Getnlwr]

Any real point?
http://www.ebay.com/itm/Dodge-Viper-Baffled-Billet-Valve-Cover-Breather-Kit-Filter-Oil-Cap-/111250111735

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[TowDawg]

After seeing the mess that I drain from my can after being at the track, there's no way in hell I'd want just a breather on the valve cover. All the crap from the can would basically be blown all over the engine.

[Steve M]

IMO, no real point.

For a catch can, you either use a closed loop system like I've done that still pulls vacuum from the intake manifold, or you use an open loop system like the ACR-X setup where you no longer connect to the intake manifold (the ACR-X setup has a breather filter on the can itself). Breather filters on the valve covers will eventually get coated in oil, and start spewing that oil wherever it pleases if there's enough. No thanks.

[MI Viper]

And it says it's not compatible with Gen IV....

[rw99]

Breathers can allow you to experience some really funky smells, too. Not recommended for any street car, IMO.

[TowDawg]

Mine is an open system with a breather on top of the can. I do get catch a whiff of it every now and then, but it just helps remind me what kind of car I'm in. :)

[steve911]

IMO, no real point.

For a catch can, you either use a closed loop system like I've done that still pulls vacuum from the intake manifold, or you use an open loop system like the ACR-X setup where you no longer connect to the intake manifold (the ACR-X setup has a breather filter on the can itself). Breather filters on the valve covers will eventually get coated in oil, and start spewing that oil wherever it pleases if there's enough. No thanks.

Got some pics of your setup?

[Steve M]

It's nothing to write home to mom about, but here are a couple:

http://i305.photobucket.com/albums/nn227/meentss02/CatchCan4_zpscff1c0eb.jpg

http://i305.photobucket.com/albums/nn227/meentss02/CatchCan3_zpsee5d39bc.jpg

[TrackAire]

And it says it's not compatible with Gen IV....

IMO, the only reason this would not work on the Gen 4 is the oil fill is still on the drivers side (like a Gen 3) but the PCV valve is on the passenger side of the valve cover. It should work for the Gen 3 motors no problem assuming the vacuum inlet port has been blocked off.

Most people do not understand that air purposely gets sucked from the non-PCV valve cover and controlled by the PCV valve on the opposite side valve cover. I can't remember the scientific principle name (maybe Bernoulli's) but for the PCV to function correctly, there has to be an air inlet and air outlet through the engine. The connection to the intake manifold is primarily to keep the fumes from getting to our pristine atmosphere. The vacuum of the intake requires the PCV valve to not only be a one way valve, but to be able to one way, closed and free flow.

Ever notice that on a Gen 4, there is no oil in the line or clean air side of the air filter housing where the drivers side valve cover vents to? It is always sucking air into the engine (oil can't go against the flow of air). In a closed loop system, the intake vacuum is the key for 95% of the oil being sucked into the manifold. This only holds true if the engine is in good running condition without excessive blow by at the rings, etc.

Also, those with superchargers or turbos, the above may or may not be correct because of the boost pressure your FI produces....totally different set of rules depending on the set up of the crankcase ventilation.

Overall, the ebay venting system would work great for a part time track day car that has the oil fill on the correct side. Another benefit is by disconnecting the PCV hose to intake manifold inlet and capping it off you should theoretically get a little bit better braking power since all vacuum is going to the brake booster and not competing with the venting of the engine.

[AaronFL]

Steve M, that setup is hawwwt!

[RedTanRT/10]

Breathers can allow you to experience some really funky smells, too. Not recommended for any street car, IMO.

I've never had an issue


Got some pics of your setup?

this is why you need a catch can

http://gallery.viperclub.org/data/500/medium/catch_can.jpg (http://gallery.viperclub.org/showphoto.php/photo/66926/title/catch-can/cat/500)

[100]

I've been researching this for my 60's small block chevy (SBC).

First of all, since the early 60's automobiles started using a 'positive crankcase ventilation' (PCV) system -- there are three reasons to have this system.
1) If a positive pressure builds up in the crankcase, the engine's seals will leak and it will have a low compression and leak oil everywhere.
2) A PCV system recycles oil blow-by in the valve covers and recycles it back into the Intake Manifold (with unburnt gasoline).
3) The scavenged Oil/gas doesn't go into the atmosphere, but is burn't in the combustion chamber.

A PCV valve stays open during idle/cruise (moderate vacuum). The PCV valve closes under acceleration (high vacuum). My Chevy has a hose with a PCV going into the intake manifold on one valve cover and on the other valve cover, a hose directly into the carburetor. I'm going to remove the carburetor hose and put a filter on the valve cover. So, during normal operation, the intake manifold draws the crankcase oil/air/gas mixture through the entire engine (from opposite valve cover - crankcase -- valve cover -intake manifold.

Catch Cans:
Catch Cans appear to be marketed toward racing/turbo applications (a lot of oil/gas blow-by?). Nevertheless, I'm installing a Mishimoto on the SBC and will eventually put one on my GTS. So, on the Chevy I'm putting a filter on the non-pcv valve cover and putting a catch can (no filter) between the intake manifold and the PCV valve.

[TowDawg]

I've never had an issue



this is why you need a catch can

http://gallery.viperclub.org/data/500/medium/catch_can.jpg (http://gallery.viperclub.org/showphoto.php/photo/66926/title/catch-can/cat/500)

Damn that's smart! I re-tapped the bottom of my can, installed a hose barb, ran a line to the bottom of the car and put a valve on it so I could empty mine. Never even thought of just taking off the filter and using a bleeder to suck the crap out.

[RedTanRT/10]

Thanks Tow, friend of mine showed me this tip. He also gave me a good tip on checking the level, just take the filter off and use a white zip tie as a dipstick. Hope all is well. Mike

[steve911]

It's nothing to write home to mom about, but here are a couple:

http://i305.photobucket.com/albums/nn227/meentss02/CatchCan3_zpsee5d39bc.jpg


What if anything did you do on the drivers side valve cover?

[Derek Short]

Steve,
I really like how clean that set up looks. Where did you get it at?

[Steve M]

What if anything did you do on the drivers side valve cover?

Driver's side valve cover is still as it was from the factory - the fresh air line from the airbox runs to it untouched. Since this is a sealed unit, it still needs a source of make up air. On mine, that line was completely dry, and continues to be that way.


Steve,
I really like how clean that set up looks. Where did you get it at?

I pieced the parts together myself, but it is based on an RX Performance catch can. I still need to paint the bracket I made, but I've been too lazy...I think it would really help it blend in a bit better.