ATTN: everyone who has a fliter on the valve cover breather
#21
I currently have a diy catch on the PCV side and on the breather side I have it hooked up to a catch with a breather on it. I used to just have it hooked up between the filter and the turbo but I noticed that oil was gettin there and I didnt want that. I have had it like this for a couple of months and havent had any issues. In this pic on the left side you can see my crankcase breather catch.
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#22
Remember Matt's dyno video? The first time I saw it, I was surprised at how much blowby there was coming out the filter, I thought I could see wisps of smoke, but then I was thinking the exhaust blanket was flapping in the breeze. Sure, it could be leaking past the regular check valve on the other side (I doubled mine up, not sure if this helps, but on a 99 you're in a special situation with a 90* bend to make), but it's not unheard of to pressurize the crankcase under load.
Also, there's pumping losses associated with moving the air back and forth from the inner cyls to the outer under the pistons. I've seen numbers saying it's pretty high but I don't 100% buy into it. They sell big electric pumps for that reason, but anyway... that's why I run my line to the intake of the turbo. That much flow (enough to activate jets on a carburetor) should put some suction on the crankcase.
Also, there's pumping losses associated with moving the air back and forth from the inner cyls to the outer under the pistons. I've seen numbers saying it's pretty high but I don't 100% buy into it. They sell big electric pumps for that reason, but anyway... that's why I run my line to the intake of the turbo. That much flow (enough to activate jets on a carburetor) should put some suction on the crankcase.
#23
I used to run crankcase evac systems on a bracket racing 67 Firebird and a 92 Mustang for open tracking. Based on data I saw and more experienced advice, I ran them. Anyway, best thing to do all around is to mount a catch can between the PCV and the intake, and a can or filter between the valve cover and turbo. The crankcase will experience negative pressure which is what you want, and if you're running an AFM or MAF the signal won't be screwed up. If you're running a MAP based system then it doesn't matter since there's no airflow signal to be screwed up by an air leak. You can't have one catch can since the PCV system and the other valve cover hose must remain independant of each other.
I run a DIY catch can on the PCV side and a fuel filter on the valve cover to the intake hose before the turbo. If the fuel filter appears to be overwhelmed with oil, I'll install another DIY catch can in that spot.
I run a DIY catch can on the PCV side and a fuel filter on the valve cover to the intake hose before the turbo. If the fuel filter appears to be overwhelmed with oil, I'll install another DIY catch can in that spot.
#25
Ok, time to ask. It's been bugging me this whole time.
WHY a catch can? So what if you get a little oil in the engine? Won't it just burn off? My guess if you plug the lines with oil, or get build up in the manifold, but I'm curious.
edit:
Heh, My turbo was glowing and glowing last time I had a 6 mile race with a few stoplights with a R6. I wouldn't have been under the hood, but the brakes went out - cooking the master cylender. Ooops.
WHY a catch can? So what if you get a little oil in the engine? Won't it just burn off? My guess if you plug the lines with oil, or get build up in the manifold, but I'm curious.
edit:
Heh, My turbo was glowing and glowing last time I had a 6 mile race with a few stoplights with a R6. I wouldn't have been under the hood, but the brakes went out - cooking the master cylender. Ooops.
#26
2 Props,3 Dildos,& 1 Cat
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Join Date: Jun 2005
Location: Fake Virginia
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a catch can because:
* oil in your intercooler reduces its effectivenes
* oil in your intake makes a huge mess
* oil in your turbo makes it hard to determine if you have turbo bearing issues
* catch cans look effin cool.
* especially WOT's cheap ones.
* oil in your intercooler reduces its effectivenes
* oil in your intake makes a huge mess
* oil in your turbo makes it hard to determine if you have turbo bearing issues
* catch cans look effin cool.
* especially WOT's cheap ones.
#31
Who was the guy that was using a oil filter or a fuel filter that he got at home depot or something.
So whats the consensus right now?
Catch can on the PCV side between PCV and intake manifold
and
Catch can on breather side but connected to a filter instead of pre turbo.
Yes?
So whats the consensus right now?
Catch can on the PCV side between PCV and intake manifold
and
Catch can on breather side but connected to a filter instead of pre turbo.
Yes?
Yes. Thats exactly how I have mine.
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#35
Not as pretty as what Wideopentunig has there but it works and shouldnt cost more that $20.
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#36
Boost Czar
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Who was the guy that was using a oil filter or a fuel filter that he got at home depot or something.
So whats the consensus right now?
Catch can on the PCV side between PCV and intake manifold
and
Catch can on breather side but connected to a filter instead of pre turbo.
Yes?
So whats the consensus right now?
Catch can on the PCV side between PCV and intake manifold
and
Catch can on breather side but connected to a filter instead of pre turbo.
Yes?
#37
I guess the PCV side doesn't make to much sense considering the pressure in the crank case shouldn't be any different at cruise with or without a turbo and if one has a functioning PCV then no oil should pass through it at boost.
The catch can on the PCV side is just a nice insurance policy I think, especially since you don't want oil infused air to be pushed into all the vacuum plumbing. I am curious what is the real answer.
So in reality all a catch can is doing is preventing oil from escaping and making a huge mess.
#38
One of my other little projects is a turbo diesel, and this thing is under boost at cruise. We've tried this little exhaust check-valve thing I've seen for chevy's... The idea is that it sucks into the exhaust (no worried about oil, then, since it "burns in the exhaust", at least doesn't end up in the intake)... Which might work in a high velocity exhaust, but I can't say I have a strong feeling about it working yet.