bye bye pcv any negatives to it???

[EvanD]

I am installing a new set of vavle covers and MSD coils. They have the coil brackets and a large opening for a push in breather or you can run it normally.
I am going to fill in the intake hole with epoxy or maybe a little JB weld. I have a wine cork in it now.
Would this pose any oil related problems. This is how my boats run and they have always been fine.

 

[demarpaint]

It might not be legal since you are in effect tampering with the emissions system? Need more info on the vehicle, and emission laws in your state.

 

[gathermewool]

Besides it being illegal I don't see any issues. Just make sure to keep an eye on the breather - clean it regularly.

 

[Chris142]

The PCV valve helps to remove contaminants from getting in the oil. Removing it would definatly shorten engine life. Who knows how much.

 

[EvanD]

Whats it removing its a valve not a filter? I think your a little confused.


Emissions are odb reader only. I love when they just use the reader bye bye headaches as anything else can be tuned out. Yes no more MAF, CAT, PCV,

 

[bepperb]

The valve prevents contaminants from getting in the oil. It's a one way valve. The one way is out. I don't think Chris is the one confused about the purpose of it.

Completely cap it off? All the blowby needs to go somewhere, I'm not sure how it's going to get out otherwise. So personally, I'd rather use a breather with a filter or a PCV to a catch can.

 

[EvanD]

Thats the intake hole blocked.

 

[JHZR2]

illegal, higher pollution.

 

[lexus114]

Originally Posted By: JHZR2
illegal, higher pollution.


plus not good for the engine,as others have stated.

 

[d00df00d]

Originally Posted By: Chris142
The PCV valve helps to remove contaminants from getting in the oil. Removing it would definatly shorten engine life. Who knows how much.

^^ This.

Also, positive crankcase pressure reduces efficiency.

Venting to atmo is certainly not the worst thing you can do, but it means you don't have the benefit of intake vacuum to help remove vapors from the crankcase.

 

[MrHorspwer]

Quote:
Also, positive crankcase pressure reduces efficiency.

Venting to atmo is certainly not the worst thing you can do, but it means you don't have the benefit of intake vacuum to help remove vapors from the crankcase.


PCV goes in front of the throttle plate, not behind it. No intake manifold vacuum is applied to the crankcase. If you were to port intake manifold vacuum to the crankcase, it would create, in effect, a giant vaccum leak.

Unless you have a crankcase vaccum pump, all crankcases have positive pressure.

 

[Zaedock]

Originally Posted By: MrHorspwer
PCV goes in front of the throttle plate, not behind it. No intake manifold vacuum is applied to the crankcase.


I guess all Jeep 2.5L and 4.0L engines with the PCV line going to the intake manifold are wrong.

The line in front of the throttle plate and behind the air filter(location depends on design), is the engines fresh air intake.

 

[EvanD]

You need to understand the real reason its on your cr/truck. emissions only!!

Some pcv's are on the intake manifold. Forward of the throttle body sounds like a real mess and would lead to a few problems. I wouldn't want to buy something running that set/up.

Older cars did not use this set/up my boat engines do not use this set/up

My real question was more or less are those vapors gonna due anything harmfull to my oil or are they just gonna gunk up my intake manifold.

 

[JT1]

Originally Posted By: MrHorspwer


PCV goes in front of the throttle plate, not behind it.



Your wrong.

 

[AuthorEditor]

Pretty good description of what a PCV valve does and how it works here: http://workingtofu.blogspot.com/2008/07/how-does-pcv-valve-work-what-is-it.html

I'd use a PCV catch can instead of plugging it up. You still need to vent the crancase somehow.

 

[Zaedock]

Originally Posted By: evandostert
My real question was more or less are those vapors gonna due anything harmfull to my oil or are they just gonna gunk up my intake manifold.


Your oil will contaminate with combustion byproducts faster and there is a chance that your engine's seals could be compromised due to added crankcase pressures under certain conditions.

 

[MrHorspwer]

Originally Posted By: JT1
Originally Posted By: MrHorspwer


PCV goes in front of the throttle plate, not behind it.



Your wrong.


You're right. I'm wrong.

I sat here for the past half hour and realized I was thinking completely backassward.

My fault... and it won't let me edit.

 

[sunfire]

You'd probably end up with a lot of sludge in your engine. Good thing PU will clean it all up for you.

 

[d00df00d]

Originally Posted By: MrHorspwer
PCV goes in front of the throttle plate, not behind it. No intake manifold vacuum is applied to the crankcase.

You're right for some cars. I should have been more specific.

Even for the cars that run the PCV line before the throttle body, there is still a slight effective vacuum. Under load and at high RPMs, the movement of air through the intake plumbing generates a low pressure zone where the PCV line meets the intake tubing. On many cars the PCV line also meets the intake piping at an angle, which enhances that effect.


Originally Posted By: MrHorspwer
Unless you have a crankcase vaccum pump, all crankcases have positive pressure.

Indeed. The question is how much.

A stock PCV system is designed to minimize it (to some extent) in addition to controlling emissions.

 

[demarpaint]

The crankcase has to be vented. I remember a friend years ago plugging one up, and he started using oil, and leaking it. If you decide to do away with it make sure you put some kind of vent in its place.