Catch Cans

[stannypack]

I’ve never put a catch can on anyone of my high-performance vehicles in my lifetime. I’m just wondering if any of you guys have failed emissions depending on your state for having one.

I had the frpp catchcan on my ecoboost and it caught quite a bit of oil from only 1k miles (I did push it pretty hard), but I think in california it'd fail smog check. Wouldn't fail emissions where I'm at now in VA since it doesn't affect emissions.

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[GregO]

I’m just wondering if any of you guys have failed emissions depending on your state for having one.

If it’s a CCS I can’t see it failing.
OCS, now that might be mandatory jail time in some states….. LOL

I’m a fan of the FP multi-mesh screen design, price….. who cares at this point.

 

[ice445]

I’ve never put a catch can on anyone of my high-performance vehicles in my lifetime. I’m just wondering if any of you guys have failed emissions depending on your state for having one.

You can fail in Utah now for it, but luckily it's pretty easy to just take it off before you go for your inspection. Newer cars are only every 2 years anyway until they're 6 years old, so not a big hassle....yet.

 

[luc]

The reason the drivers side can never catches any oil is because that side is to allow air into the block in the event of a vacuum build up. So the airflow is going the other way. If you look the other end the hose attaches to the air intake tube between the air filter and the throttle body. So it's allowing filtered air into the block. Only the passenger side is made to allow air pressure to escape out of the block.

Wrong, if you track the car fast enough, you will get oil on the driver side. In fact so much with the factory plastic valves covers that i had to change to the 500 aluminum that have a much better baffling and drainage system with multiple 1 way silicone drain valves

 

[GregO]

You can fail in Utah now for it,

Utah has an under the hood visual inspection ?
State wide or just around Salt Lake City area ?

 

[ice445]

Utah has an under the hood visual inspection ?
State wide or just around Salt Lake City area ?

Yeah as of last year, I think it's just SL, Davis, and Utah counties right now. They take pictures of your catalytic converters and everything.

 

[GregO]

Yeah as of last year, I think it's just SL, Davis, and Utah counties right now. They take pictures of your catalytic converters and everything.

Yikes

 

[Dapepper9]

Wrong, if you track the car fast enough, you will get oil on the driver side. In fact so much with the factory plastic valves covers that i had to change to the 500 aluminum that have a much better baffling and drainage system with multiple 1 way silicone drain valves

That's because on the track the car's operation is in a range that PCV valve isn't enough to keep up with the building crank pressure. UPR has their clean-side seperator which is one way to handle this. Can also vent to a can with an open air breather. Won't collect a ton and will be in those hard use situations but it's cheaper and easier than changing valve covers out

 

[Gfswindle]

I've only ever built my own catch can systems from cheap ebay/Amazon baffled cans. The one I currently have has ss wool as the baffle media and works very well. So well in fact that over the winter on e85 I neglected to check it as often as I should have and it nearly completely filled with water after only a couple months. I used -10an fuel hose to route the lines to a mounting point away from engine heat as the catch cans purpose is to condense blow by gases and oil Vapor so keeping the can and baffling as cool as possible is key.

 

[WItoTX]

AAD makes a pretty nice catch can, only issue is you have to come up with your own hoses.

 

[luc]

That's because on the track the car's operation is in a range that PCV valve isn't enough to keep up with the building crank pressure. UPR has their clean-side seperator which is one way to handle this. Can also vent to a can with an open air breather. Won't collect a ton and will be in those hard use situations but it's cheaper and easier than changing valve covers out

I disagree, under high rpm’s, the volume/pressure of crankcase blow by gas is more than what the Pcv valve can flow. Therefore this extra pressure/volume exit through the clean air side to be recirculated through the combustion chambers
By using a 1 way valve on the clean air side that stop this extra pressure/volume to escape, you’re increasing crankcase pressure and that is bad for multiple reasons, seals leakage being 1 of them, slight loss of hp being another one…
The correct way to deal with it is exactly what ford did: allowing this extra pressure/volume to escape through the clean air side but removing most of the oil from it by designing valve covers that are much better are doing so

 

[Dapepper9]

I disagree, under high rpm’s, the volume/pressure of crankcase blow by gas is more than what the Pcv valve can flow. Therefore this extra pressure/volume exit through the clean air side to be recirculated through the combustion chambers
By using a 1 way valve on the clean air side that stop this extra pressure/volume to escape, you’re increasing crankcase pressure and that is bad for multiple reasons, seals leakage being 1 of them, slight loss of hp being another one…
The correct way to deal with it is exactly what ford did: allowing this extra pressure/volume to escape through the clean air side but removing most of the oil from it by designing valve covers that are much better are doing so

1. You agree with me actually because I said the same thing
2. You’re thinking of their check valve breather. The clean side separator doesn’t have a check valve, just a catch can like baffle/screen system. Crank pressure flows out and the oil catches on the screens. Also that 1 way valve you’re thinking about works in the opposite direction thinking. Pressure goes out but clean air does not

 

[luc]

1. You agree with me actually because I said the same thing
2. You’re thinking of their check valve breather. The clean side separator doesn’t have a check valve, just a catch can like baffle/screen system. Crank pressure flows out and the oil catches on the screens

???you said on your original post that upr clean-side separator is one way ???

 

[Dapepper9]

???you said on your original post that upr clean-side separator is one way ???

My bad, "one solution to reducing this problem" sound better?

 

[luc]

My bad, "one solution to reducing this problem" sound better?

Lol. Yes

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