I see many cars with their PCV valves elminated. They just put a small air filter over the hole in the valve cover, and then they block off the nipple on the plenum. Why don't I see many people on here doing that? Are there risks that I am unaware of? Every DSM owner that I meet tells me to just get rid of the PCV valve.
eblank8
Eliminate PCV Valves?
A lot depends on your local emission laws. If they don't require a working PCV system, then you can legally remove it.
On a mechanical level, the area close to where your breather filters are will end up coated with oil film even with the filter on. If for some reason there is a spark at the wrong time next to the breather filter, the fumes coming out will ignite and can cause the filter to catch fire and you now have an engine fire. That is extremely rare but you should be aware that you are expelling flamable gasses into your engine bay.
IMO a better way to go if you just want to clean up your intake is to use oil catch cans. The PCV system is more than just an emissions control system. It ventilates the crank case better than with just breather filters. The PCV system uses engine vacuum to pull crank case gasses out of your engine and pulls fresh air in. Breather filters don't do that.
On a mechanical level, the area close to where your breather filters are will end up coated with oil film even with the filter on. If for some reason there is a spark at the wrong time next to the breather filter, the fumes coming out will ignite and can cause the filter to catch fire and you now have an engine fire. That is extremely rare but you should be aware that you are expelling flamable gasses into your engine bay.
IMO a better way to go if you just want to clean up your intake is to use oil catch cans. The PCV system is more than just an emissions control system. It ventilates the crank case better than with just breather filters. The PCV system uses engine vacuum to pull crank case gasses out of your engine and pulls fresh air in. Breather filters don't do that.
I leave the PCV valve installed and just put the rear cover outlet on a breather filter instead of piping it into the turbo.
Has worked great so far, there is never any residue around the filter or even in it.
Previously I was getting a bit of oil in the rear turbo inlet.
I will move to a catch can once I clear enough crap out of the way to mount one.
Has worked great so far, there is never any residue around the filter or even in it.
Previously I was getting a bit of oil in the rear turbo inlet.
I will move to a catch can once I clear enough crap out of the way to mount one.
well the whole reason the rear cover is plumbed into the intake path is so that it sees vaccum while under boost since the line on the intake plenum is blocked off under boost.
You can get some generic versions of the crank vents that are much cheaper, around $20 each, I recommend searching for them.
You can get some generic versions of the crank vents that are much cheaper, around $20 each, I recommend searching for them.
You have to have some sort of crankcase evacuation on a street car, unless you want to change your oil weekly, and risk blowing your valve covers through your hood..
If you run a stock ECU, you have to be aware of the fact that venting the crankcase to atmosphere with a working PCV, will introduce unmetered air into the system.
If you run a stock ECU, you have to be aware of the fact that venting the crankcase to atmosphere with a working PCV, will introduce unmetered air into the system.
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