PCV Valve.. delete?

[TheRoadVirus]

In theory, wouldn't a breather and a PCV both ventilate the crankcase? I can see having neither being an issue, but if you have one or the other.. don't they essentially do the same thing? I realize the breahter doesn't "recycle" the vapors, correct me if I'm wrong.

 

[O'Rattlecan]

You're right, they both correct the problem but do it in different ways.

Ryan

 

[flareside_thunder]

In theory, wouldn't a breather and a PCV both ventilate the crankcase? I can see having neither being an issue, but if you have one or the other.. don't they essentially do the same thing? I realize the breahter doesn't "recycle" the vapors, correct me if I'm wrong.

Ya know...you're never around anymore man but when you are gawd you've got useful information.

TAAAA DAAAAAAAAA!

 

[Skandocious]

In theory, wouldn't a breather and a PCV both ventilate the crankcase? I can see having neither being an issue, but if you have one or the other.. don't they essentially do the same thing? I realize the breahter doesn't "recycle" the vapors, correct me if I'm wrong.

I don't know if that's entirely true. I don't know exactly how the inner PCV mechanism works but keep in mind that it's a VALVE, not a straight pass-through. I don't know exactly which vapors it allows through and which it doesn't (if at all). But there is clearly a mechanism in there.

 

[flareside_thunder]

all the PCV valve is is a check valve....

 

[89frankenford]

yeah i believe in a PCV Valve there is a check valve in it. now correct me if im wrong but i believe that the check valve stays closed until there is a certain pre determined amount of pressure until it raises up and releases the pressure

 

[Skandocious]

yeah i believe in a PCV Valve there is a check valve in it. now correct me if im wrong but i believe that the check valve stays closed until there is a certain pre determined amount of pressure until it raises up and releases the pressure

If that's the case then a breather would not be the exact same thing.

 

[fatherdoug]

Is it pressure or vacuum that operates the check valve? If you pull the pcv valve out of the valve cover and stick your finger over it, the vacuum from the source on the other end of the line sucks the check valve open.

 

[TheRoadVirus]

If that's the case then a breather would not be the exact same thing.

Don't be so picky with words, it makes you look stupid.

As long as you have one or the other you'll be fine.

 

[NeXtras]

PCV Valve is Vaccum operated

 

[89frankenford]

and i believe the breather is an open filter element. hmm now how much power/MPG/longevity will you get outta each if they were installed?\\i honestly dont know..i know the breather has a tendency of getting the valve cover dirty from small amounts of oil

 

[Bricks]

The spring tends to hold the valve closed, and vacuum tends to keep it open.

I suppose that's why it's called a positive crancase ventilation valve - it's always pulling vapors no matter the engine situation.