Catch can

[AGlobalThreat]

I'm debating putting a catch can on my 1jz. They're recommended for boosted engines right? Just put the lines from the cam covers to the top of the catch can and mount it in a place it can stay cool.

Is something like this ok? (From ebay, I don't wanna pay $100 for a catch can from MVP.. )

Anybody running something like this on their 1jz?

I want to learn so please enlighten me :icon_surp

 

[HIDPLANET]

Seems like a reasonable mod.
Only concern might be, how will the ECU react to the loss of pressure that it thinks its seeing. I would think a catch can would appear to be a leak by the ECU.

 

[tsuper92]

this is how i set mine up

 

[MDCmotorsports]

Just as long as the catch can isn't vented and has vacuum to it, you should be good to go!

 

[OneJSupra]

Just as long as the catch can isn't vented and has vacuum to it, you should be good to go!

yeah i have cc on my 1j. i ran it from the pcv to the cc and from cc back to intake manifold. you'll be surprised how much oil in the cc after a week of daily driving.

 

[1jzMoe]

On my 1j i just routed it from the valve cover to the catch can and then to the intake, pretty much the same as stock but with the catch can in between and it catches a whole crap load of oil. It runs fine that way, and stopped alot of the smoking the car used to do.
Here are some pics, if you see it close up one line is black with oil and the other one barely has a slight oil residue, i know it doesnt look like that but it is.
http://a69.ac-images.myspacecdn.com/images01/52/l_ee298ea9cda401c66bc850a2a62cd3ac.jpg
http://a285.ac-images.myspacecdn.com/images01/35/l_d74fb3b772ead7220191277239178cac.jpg

 

[Tim]

Just as long as the catch can isn't vented and has vacuum to it, you should be good to go!

I have had mine hooked up with the catch can vented for a while now. I have also ran it this way on my other cars too. Is their a problem with running it open without a vacuum source? I figure as long as the pressure can escape out of the case it won't push oil through the valve seals.

 

[tlo86]

I have had mine hooked up with the catch can vented for a while now. I have also ran it this way on my other cars too. Is their a problem with running it open without a vacuum source? I figure as long as the pressure can escape out of the case it won't push oil through the valve seals.

nope it will go through the valve seals... ask me how i know i used breathers on mine and they leaked after a month or three of casual driving... used a catch can from valves to can and my vac source wasnt a good vac source and they pushed through the valve seals again...

turbo 7m has a good setup, just be sure to have good seals, teflon used, and to clean that nasty thing out once in a while

 

[MDCmotorsports]

I have had mine hooked up with the catch can vented for a while now. I have also ran it this way on my other cars too. Is their a problem with running it open without a vacuum source? I figure as long as the pressure can escape out of the case it won't push oil through the valve seals.

Not a good idea on a boosted car. I have seen many an engine come back out again due to failed front/rear/cam seals because of no crankcase vacuum.

 

[annoyingrob]

I run that ebay catch can on mine. I have it between the PCV, and intake manifold. It catches a lot of oil. The only problem is I hit high boost, and it leaks out the bottom and the little view tube on the side due to it being under pressure.

 

[MDCmotorsports]

I run that ebay catch can on mine. I have it between the PCV, and intake manifold. It catches a lot of oil. The only problem is I hit high boost, and it leaks out the bottom and the little view tube on the side due to it being under pressure.

You're asking for trouble with it setup like that. You need to be pulling vacuum from the turbo inlet.

 

[annoyingrob]

You're asking for trouble with it setup like that. You need to be pulling vacuum from the turbo inlet.

What are you talking about? It's set up just like stock, except there's a sealed container in between the intake manifold, and the PCV valve. Hell, I made sure to get a bung welded onto the intake pipe of my turbo specifically to I could retain the stock PCV system.

Pictured here, the hose is off from the intake pipe to the valve cover, but there's usually a hose there. Then it goes out of the valve covers, through the PCV valve, into the catch can, then back out to the intake manifold.

 

[MDCmotorsports]

You stated that you have the catch can re routed back into the intake manifold, not the turbo intake. I know the stock 1j has a pcv off the intake cam, but it also should have a one way valve in the line. If you run the catch can into the intake manifold post throttle body, you're risking pressure on the crankcase area and thus blowing seals.

 

[annoyingrob]

I still don't get you. The valve is located on the intake cam cover, and only lets air pass from the cam cover to the intake manifold. This is the stock setup.

Under engine vacuum, the gases are sucked into the intake manifold. Under boost, the valve prevents any pressure from the IM to enter the cam cover, and gases exit to the turbo intake pipe.

Yes the catch can is connected to the intake manifold, but with a 1-way valve between the cam cover, and the catch can, if there's pressure pushing into the can, there's no way for it to get out. It's NOT pressurizing the cam covers.

 

[MDCmotorsports]

Good call, that works. Didn't know you had the one way valve in place.

 

[Tim]

I just don't see how it will blow out my valve seals if I am running a 1" piece of hose to the catch can with a vent. That will move more than enough volume of gas to relieve the pressure in the case. I understand running a little breather filter is a bad idea because it gets instantly clogged with oil and then no longer lets gases escape. The point of my setup is not to pull out the oil, but to releave the case of pressure, which my setup does fine and I have ran it this way on many cars for years with no problems. I don't want my hot crankcase gases being sucked back into my engine. The reason you guys get oil in your catch can is because the engine vacuum is sucking it out of the case which does no good. by the way, the whole point of a pcv system is only for emissions. Look at the people with performance carbuated v8's, they are not running pcv systems, they are running breathers or vents.

 

[Rich]

Yes, just vent it, I had it for years without problems. I only now run a catch can to keep the car clean from oil spatters.
The catch can needs to be in a cool place so the oil in the air can condensate. If it's in the hot engine bay and you re-routed it back into the turbo intake there's a lot of air-with-oil being sucked back in which then will condesate in your IC.
I have my catch can positioned in front of the radiator.

Best way to vent the case is to run them to the exhaust via a one-way valve > no oil back into your engine and always vacuum.

 

[hottscennessey]

I destroyed my last two turbos, and nearly my motor (every seal in it) from venting PCV without vaccum (7MGTE). It may work for some of you but for me, I'd never risk it again.

 

[Rich]

I destroyed my last two turbos, and nearly my motor (every seal in it) from venting PCV without vaccum (7MGTE). It may work for some of you but for me, I'd never risk it again.

Check your static compression, you probably have piston ring blow-by, that's what's blowing your seals.

 

[OneJSupra]

I run that ebay catch can on mine. I have it between the PCV, and intake manifold. It catches a lot of oil. The only problem is I hit high boost, and it leaks out the bottom and the little view tube on the side due to it being under pressure.

that's how mine is exactly installed just like stock and it works great. Had the same problem when hitting boost it would leak out. I resealed all the connectors in the cc with permatex thread sealant and removed the view tube and just blocked off the holes with new screws. Only trouble now is you can't see how much oil in the cc but you can always drain every month to check. No more leaks after that.