I have noticed that some people run a small filter on the valve cover. My car has a rubber line that goes from there to the C.A.I.

What is the advantage of one over the other?

Thanks.

E.Honda

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by E.Honda &raquo;</TD></TR><TR><TD CLASS="quote">I have noticed that some people run a small filter on the valve cover. My car has a rubber line that goes from there to the C.A.I.

What is the advantage of one over the other?

Thanks.

E.Honda</TD></TR></TABLE>

If I understand what you are asking. The purpose of that rubber hose is to feed crank case vent gases back into the intake so it can be burned up. Basically you are burning up your crank case emitions. This is environmentally friendly but theoretically hurts performance. By directly venting it to the atmosphere you hurt the environment but you get better performance. I am sure a lot of people just do it as a fad.

At least this is my understanding of it all

I hoped that helped and
Cheers!

 

I heard those breather filters are not good. They look ugly to me anyway

 

bump 4 more opinions.

 

I've never really hard the reasoning behind this, and I'm curious to know. Can anyone back up what Neri said?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by old man neri &raquo;</TD></TR><TR><TD CLASS="quote">If I understand what you are asking. The purpose of that rubber hose is to feed crank case vent gases back into the intake so it can be burned up. Basically you are burning up your crank case emitions. This is environmentally friendly but theoretically hurts performance. By directly venting it to the atmosphere you hurt the environment but you get better performance. I am sure a lot of people just do it as a fad.

At least this is my understanding of it all

I hoped that helped and
Cheers!</TD></TR></TABLE>

i think you hit the nail on the head. i didnt feel any difference when i did it, but my intake didnt make me feel a difference either.

i just did it because my filter came with one.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egsedan &raquo;</TD></TR><TR><TD CLASS="quote">

i think you hit the nail on the head. i didnt feel any difference when i did it, but my intake didnt make me feel a difference either.

i just did it because my filter came with one.</TD></TR></TABLE>

lol. It was funny, when my car was auto I didn't feel anything either. However, when I swapped my car to a manaul that's when I felt more of a gain. Or maybe it was the fact that I had a tad bit more torque due to new manual transmission.

 

The only real reason I have seen people do this is they have had problems with their car and it fixed it. Like they have vacuume leaks or problems with it cracking and breaking off. It feeding oil into the intake for other reasons. Sort of a ban-aide solution for older cars. You see this a lot on MKII VWs. I personally would just leave it on and do the environment a favour.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by old man neri &raquo;</TD></TR><TR><TD CLASS="quote">The only real reason I have seen people do this is they have had problems with their car and it fixed it. Like they have vacuume leaks or problems with it cracking and breaking off. It feeding oil into the intake for other reasons. Sort of a ban-aide solution for older cars. You see this a lot on MKII VWs. I personally would just leave it on and do the environment a favour.</TD></TR></TABLE>

Right on. Thanks for clearing that up for us.

 

K, I just searched a little on the VW site.

The reason you would do it was incase you were getting a lot of oil gumming up your TB or flowing around and gumming up your intake sensor (depends on the configuration of the car) It will help prevent gumming up on that whole area, but gumming up would only occur if you had a problem cause a lot of oil to go through there in the first place.

The disadvantages are that the filter is not under vacuume anymore and fumes aren't being "sucked out". Another disadvantage is that on some cares the HVAC intake for your heater is right by there and you will have a horrid oil smell on the inside of your car.

If some one wants to research it some more please, I am also curious, although I would never do this personally.

 

The turbo guys use something similar. We use a catch can because if we hooked the tube from the valve cover up to the charge pipes it would pressurize the crank case, which you don't want.

Some just run those little filters which just vent to atmospheric pressure.

Other's run the catch can to catch the oil and unburnt gas as opposed to having it just drip onto the road or evaporate into the atmosphere.

Some guys running catch cans run a line to a pre-turbo intake which actually creates a vacuum, sucking air out of the crank case and helping with more of the **** being sucked out. Downside of that is everything that doesn't get caught in the catch can gets caught up in the turbo and intercooler. (This is pretty much what the stock PCV system does.)

-Nick

 

another thing to add is that those little filters get clogged with all that oil pretty quickly. rendering the filter useless, and in theory, not letting your blow-by gasses in your head escape.

 

Anymore?

 

I can't offer too much more information than what's already been put up (good info guys) but if i were you i would leave that tube hooked up to your intake pipe. It's better on the environment, and think of it this way: Honda designed it that way for a reason. If it really made sense to have that filter coming off the valve cover instead of recirculating it, Honda would have produced it that way. The engineers didnt spend countless hours designing things a certain way for ***** and giggles, ya know?

 

good info