My current plans are to vent my block by routing lines from the existing valve cover vent and pvc port to a catchcan and also possibly tapping 2 additional lines to the front of the valve cover if necessary. Is it safe to say that there is no way possible to return the excess oil buildup in the can to the engine like these guys with B series are doing? Am I going to be stuck draining my catch can frequently?
I was just reading about catch can setups on H-T. I'm considering changing my setup from a closed system (which uses vacuum to draw out the pressure)...to a open system (no vacuum and a breather filter on top of the catch can). Of course, the latter is dumping vapors into the atmosphere...so I'm not so sure yet.
About a return line...I wouldn't do it. Have you ever seen the stuff that's caught in the can? It's a discusting mixture of oil, water, fuel and contaminents.
It's stuff thats already in your engine anyway. Your factory system does the same thing. The reason I would prefer a return is because the car will see autox and hpde. I doubt I will ever go to a drag strip with it. With that much boosting (esp on a road course) id be afraid it would sprew everywhere in the middle of a session.
[quote=nikolai911]It's stuff thats already in your engine anyway. [quote]
.......isn't that half the reason you put the catch can.....to get the gunk out instead of putting it back into the intake mani like the stock system does, causing oil and sludge to eventually reach the cylinders, which in turn increases chances of knock or detonation? That and releive crankcase pressure.
The catchcan is to releave crankcase pressure, not to get the "gunk" out of your engine. And if we could use some sort of drainback, it wouldnt be reintroduced into the IM like the factory system. It would go straight to the crankcase.
So you are basically improving on the OEM system by releaving more pressure and removing the "gunk" thats introduced into the combustion chamber.
are you suggesting that i just drain the can manually? i know i can do that already. i am going to use the car for hpde and autox use. i would suspect that after a 20 minute session on a road course the can would prolly be overflowing, which is something that im trying to avoid.
at this point i think im just going to have one can for the valve cover and pcv ports and another for the two additional ports that i will add to the valve cover. hopefully this will allow the crankcase to breathe more easily and will be less prone to push out oil.
i would suspect that after a 20 minute session on a road course the can would prolly be overflowing, which is something that im trying to avoid.
are you kidding me? i'd bet you could drive 10,000 miles without it overflowing. how big is your can? like a vienna sausage can or something...?
i thought that the pcv valve mostly just let vapors out, which do of course have small deposits of oil, which in turn attract dust, which eventually cause a gunky buildup, but that's over a long period of time. the crankcase ventilation system doesn't "pour" oil into your catch can at the rate of a liter per 20 minutes...no way.
Maybe he is driving on a course with loop D loops so half the time hes upside down. But seriously if that much oil comes out you have a serious problem.
I auto-x and drive hard on the street...and have never emptied more than 2-5 ounces within a 2-3k mile interval. And Chris is right, the whole point is to "catch" the stuff. Most catch can setups are doing nothing more than preventing blowby vapors/oil/gunk from being sucked back into the IM. Venting the crankcase is a whole other issue that is unique to FI motors.
I was just reading about catch can setups on H-T. I'm considering changing my setup from a closed system (which uses vacuum to draw out the pressure)...to a open system (no vacuum and a breather filter on top of the catch can). Of course, the latter is dumping vapors into the atmosphere...so I'm not so sure yet.
That's a bunch of really nasty ****. I think it would be best to avoid dumping it into the atmosphere.
Besides, manifold vacuum does a better job of clearing the crank case.
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About a return line...I wouldn't do it. Have you ever seen the stuff that's caught in the can? It's a discusting mixture of oil, water, fuel and contaminents.
If the catch can sits between draining that stuff which was suspended in the oil (the fuel and water) comes out of suspension and looks like garbage. No worries if it goes back into the crankcase still hot.
That's a bunch of really nasty ****. I think it would be best to avoid dumping it into the atmosphere.
Besides, manifold vacuum does a better job of clearing the crank case.
Manifold vacuum is only present at idle, very light throttle, or deceleration...so how will vacuum help releave pressure or blowby during WOT?
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If the catch can sits between draining that stuff which was suspended in the oil (the fuel and water) comes out of suspension and looks like garbage. No worries if it goes back into the crankcase still hot.
And I say why add it back in?...really, what's so hard about emptying the can every 3k miles?
Manifold vacuum is only present at idle, very light throttle, or deceleration...so how will vacuum help releave pressure or blowby during WOT?
You have to shift sometime!
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And I say why add it back in?...really, what's so hard about emptying the can every 3k miles?
Some people put a lot more oil through the PCV than others. I've got a H22 in my non-prelude with 11:1 CR and coated pistons, and I blow sometimes a pint of oil through the pcv in a couple hundred miles sometimes. Once the BAR process is complete, I plan on putting in a catchcan with a drain. It's a lot cheaper to not have to put a quart of redline in @ $7/qt every week.
Some people put a lot more oil through the PCV than others. I've got a H22 in my non-prelude with 11:1 CR and coated pistons, and I blow sometimes a pint of oil through the pcv in a couple hundred miles sometimes. Once the BAR process is complete, I plan on putting in a catchcan with a drain. It's a lot cheaper to not have to put a quart of redline in @ $7/qt every week.
Well, I consume a good amount of oil too... but only very small amounts are through MY pcv. I have stock internals, and have actually never heard of another stock H22 blowing that much oil out of their pcv. But then again, I don't claim to know everything about our motors. How often are you dumping your catch can?...every hard drive it sounds like. And can you describe your current catch can setup...with details on hose routing?
Well, I consume a good amount of oil too... but only very small amounts are through MY pcv. I have stock internals, and have actually never heard of another stock H22 blowing that much oil out of their pcv. But then again, I don't claim to know everything about our motors. How often are you dumping your catch can?...every hard drive it sounds like. And can you describe your current catch can setup...with details on hose routing?
No catch can, but I'm running a high-comp motor. Stock PCV, I need to keep it that way to get the swap certified for smog purposes.
...I blow sometimes a pint of oil through the pcv in a couple hundred miles sometimes.
If you don't have a catch can, then how do you know that your "consumption" is through the pcv? I consume tons of oil, but only a very small portion is sucked up through the pcv.
How do you know the oil rings are good, though? Compression and leak down tests don't tell you anything about the oil control rings.
That being said, I get quite a bit of oil in my catch can as well.
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Compression and leak down tests don't tell you anything about the oil control rings. 
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