Disadvatages to open loop PCV?
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Disadvatages to open loop PCV?
Are there any disadvantages to running an open loop pcv system other than legality issues. I'm debating on how to set up my catch cans. If I run with the catch can in between the oil seperator on the back of my block and the intake manifold (ala TOO's catch can set up for operational pcv), I get good crankcase evacuation off-boost, but during boost only the valve cover breather will be open for ventilation. If I run open pcv (valve cover and oil seperator to a catch can w/ filter to atmosphere) I'll get better evacuation while in boost, but off-boost may suffer. Any drawbacks on a street driven vehicle?
[Modified by DSF, 12:04 PM 3/18/2002]
[Modified by DSF, 12:04 PM 3/18/2002]
#4
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Re: Disadvatages to open loop PCV? (DSF)
Disadvantages - none. PCV system was created for emmisions. If you think about it, eliminating the routing of these gases back into the manifold would help horsepower....hell, these gases AREN'T combustible, right.
Yeah, probably not what you were looking for...but I'm not sure what kind of answer is going to satisfy your Q. Are you wanting to stay legal or just looking for the best setup, legality aside?
Yeah, probably not what you were looking for...but I'm not sure what kind of answer is going to satisfy your Q. Are you wanting to stay legal or just looking for the best setup, legality aside?
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Re: Disadvatages to open loop PCV? (EE_Chris)
Are you wanting to stay legal or just looking for the best setup, legality aside?
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Re: Disadvatages to open loop PCV? (DSF)
There is no disadvantage to running an open system, as long as its working. Remember that for the system to be working right the crankcase vapors need to be cleared out and fresh air needs to replace it.
If you run an open system its going to be hard to get this right.
I've done a lot of research with this....from what I've seen you can only have your system working in boost or in vacuum. Since most of us have daily drivers we choose to have our set up for vacuum, which is a valve cover breather and a catch can between the engine and the intake manifold.
If you run an open system its going to be hard to get this right.
I've done a lot of research with this....from what I've seen you can only have your system working in boost or in vacuum. Since most of us have daily drivers we choose to have our set up for vacuum, which is a valve cover breather and a catch can between the engine and the intake manifold.
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Re: Disadvatages to open loop PCV? (00SilverLS)
I've done a lot of research with this....from what I've seen you can only have your system working in boost or in vacuum. Since most of us have daily drivers we choose to have our set up for vacuum, which is a valve cover breather and a catch can between the engine and the intake manifold.
#10
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Re: Disadvatages to open loop PCV? (DSF)
The concept of using the exhaust to pull a vacuum on the crankcase has been around for awhile.
My old man uses it on his 454'd S10.
I'm interested in what this type of system could do for a Honda. If you decide to go this route, do us a favor and keep this thread updated.
My old man uses it on his 454'd S10.
I'm interested in what this type of system could do for a Honda. If you decide to go this route, do us a favor and keep this thread updated.
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Re: Disadvatages to open loop PCV? (EE_Chris)
My old man uses it on his 454'd S10.
I'm interested in what this type of system could do for a Honda.
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Re: Disadvatages to open loop PCV? (DSF)
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Re: Disadvatages to open loop PCV? (blowncivichb)
When I said I did a lot of thinking about this...I did a lot . I almost made an exhaust system...but theres a problem. In any exhaust with a muffler there is going to be pressure in the exhaust. Therefore exhaust run crank case clearing wont work.
You could always run a pump...but thats $$$.
[Modified by 00SilverLS, 2:45 PM 3/19/2002]
You could always run a pump...but thats $$$.
[Modified by 00SilverLS, 2:45 PM 3/19/2002]
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Re: Disadvatages to open loop PCV? (00SilverLS)
...but theres a problem. In any exhaust with a muffler there is going to be pressure in the exhaust. Therefore exhaust run crank case clearing wont work.
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Re: Disadvatages to open loop PCV? (DSF)
I honostly dont know...you could always try it...but I think the pressure is up there....like 10 psi.. just a estimated guess, but i dont think that on a muffled car it will work.
#16
Re: Disadvatages to open loop PCV? (00SilverLS)
You are correct - On a short open exhaust system it will work. But as soon as you put in mufflers, resonators and more piping you create backpressure........
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Re: Disadvatages to open loop PCV? (MiraiZ)
ahh just remove the muffler and run striaght pipe. Might be a little loud but you said lagality aside.
[Modified by Fooser, 8:25 PM 3/21/2002]
[Modified by Fooser, 8:25 PM 3/21/2002]
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