Best catch can?
Melting Slicks
Joined: Dec 2004
Posts: 3,382
Likes: 250
Only of sorts...It has a complex function like working under different conditions of restricting flow under the higher vac of idle yet allowing more flow during WOT. It is more than a CV. Also, i have not looked, but isn't there only 1 pvc and I'm sure there is a valley breather tube and valve cover breather tube.
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
Of course mine is the best 
It is sold by CCA and a few other dealers. With a few thousand sold they speak for themselves.
Most of the better catch cans do well and I am personally a big fan of billet over the sheet aluminum models. I tried to keep my cans compact with a reasonable capacity as well being very affordable. I also take a lot of pride that my units are made completely here is the USA and not sure everyone else can say that. If they can that is great.
There is also a mention of a dual can setup. Folks may be interested in these couple pics of a bracket for that.
Thanks.
Mike Norris
It is sold by CCA and a few other dealers. With a few thousand sold they speak for themselves.Most of the better catch cans do well and I am personally a big fan of billet over the sheet aluminum models. I tried to keep my cans compact with a reasonable capacity as well being very affordable. I also take a lot of pride that my units are made completely here is the USA and not sure everyone else can say that. If they can that is great.
There is also a mention of a dual can setup. Folks may be interested in these couple pics of a bracket for that.
Thanks.
Mike Norris
Melting Slicks
Joined: Apr 2006
Posts: 2,151
Likes: 20
No check valves. The crankcase needs to breathe. Unless of course you are boosted in any way and vent into the engine for some reason. Of course, if you ever need to smog just route the lines as they were originally with the pcv in the valley tube (on early cars its in the tube coming from the driver's side valve cover).
Former Vendor
Joined: Jul 1999
Posts: 2,103
Likes: 0
From: Indianapolis Indiana
St. Jude Donor '11
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Only of sorts...It has a complex function like working under different conditions of restricting flow under the higher vac of idle yet allowing more flow during WOT. It is more than a CV. Also, i have not looked, but isn't there only 1 pvc and I'm sure there is a valley breather tube and valve cover breather tube.
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
The PCV valve prevents sudden backfire flow reversals from heading back to the engine. Yes, there is only one. The fresh air line flow reverses under full throttle. This is why if you include a catch can in the fresh air line, it must not allow oil to flow out of it when flow changes direction.
I was looking at using a 2nd can to vent the valve cover fresh air line, in addition to a breather in the oil fill cap. I'm curious how it behaves if I just cap the valve cover fresh air line.
I was wondering if a 2nd can for the valve cover fresh air line would give better breathing and help contain oil trying to come out the breather cap.
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
A correctly configured catch can design flows blowby gasses into the "can" and then through filter media, just before it exits. This is how industrial air/oil separators are set up. If the flow is reversed, blowby gasses are first filtered but then are exposed to sloshing oil in the reservoir. In addition, some of the oil droplets that are clinging to the filter media are pulled away if the air velocity is high enough. Potentially, you could rig up two check valves (each flowing opposite the other) and two lines connected to the fresh air line, but that starts to get cumbersome, space-wise.
I hear that some racers employ a vacuum pump to keep flow moving in the same direction.
I hear that some racers employ a vacuum pump to keep flow moving in the same direction.
Melting Slicks
Joined: Dec 2004
Posts: 3,382
Likes: 250
That would be cool. It is known that vacuum in the engine created by dry sump oiling systems make more horsepower. This is seen in LS3 racecars that have had drysumps added to keep them from blowing up.
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Melting Slicks
Joined: Apr 2006
Posts: 2,151
Likes: 20
Do not install a vacuum pump. Especially on an ls motor. I've seen them do a good job of extracting oil out of the motor. They are occasionally used on some drag cars. A real dry sump is far different and when setup right actually has a controlled leak or vacuum relief valve so it works properly. I've already explained how to vent the motor properly in my posts above. There is only one way and it's the right way.
Melting Slicks
Joined: Apr 2006
Posts: 2,151
Likes: 20
I finally had my car out on track and tested my catch can. It works very well. In the past I had almost no oil in the catch cans, but my intake manifold was always wet with oil and I was told that under decelration some smoke would come out my exhaust. I'm betting the oil was not getting trapped in the cans and just getting sucked into the intake. Now, I get about 1/4qt. of oil per session. Seems like a lot, but not unusual. Anyhow, my catch can is doing its job.
