i have been hearing stories about people sucking oil out of there valve cover into there intake pipe. I was curious if i should get a breather for my valve cover what do u think? With this affect anything and its for a 1997 GSR w/ JRSC

please let me know

 

i can't give you a big long explanation, but you pretty much said it anyway...the answer is you should put a breather filter onthe valve cover, and cap off the hole left in the intake arm...but for passing emissions, you will need to reconnect the hose...for some stupid reason the breather cap is illegal.

 

but i heard from some people that the breather is a bad idea for some odd reason and it will make my car run weird i read this on some other post

i checked my hose and theres no oil going through it but i was just curious no moisture either

 

I have a breather on my Valve Cover. No problems whatsoever.



It's illegal to have one of these?

 

when I had my JRSC on i put a breather on it to, never really check to see if any oil was in it though

 

Yes it is illegal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">Yes it is illegal.</TD></TR></TABLE>

damn!

 

you are supposed to have air pressure under the valve cover. putting a dinky filter just keeps the oil from shooting out. it is not supposed to be used at all.

there is usually very little oil that comes out anyway, just connect it up to your intake setup

 

The best way is to not have a breather but make that air intake tube so that air can travel in 1 way only and that air INTO the valve cover. Others have made a "slash cut" on the tube INSIDE the main intake tube... without pictures I think my post is very confusing... sorry....

 

*disregard this post, see below*

As I said in the other post, the crankcase blows vapors out that hole, and the intake manifold sucks them in for re-combustion. It helps emissions which is why it's illegal to remove it, and it also helps the engine by relieving the built up crankcase pressure. With a turbo or centrifugal supercharger, you have to remove it since the intake pipe has positive pressure, and it would try to blow back into the crankcase (which is bad). With a JRSC you should leave the stock setup, or maybe run an oil catch can so not as much oil-laden vapors go into the supercharger.


Modified by PatrickGSR94 at 10:35 AM 4/17/2003

 

Stick with stock...there is a reason that its designed like that, Patrick pointed it out.

 

Its a bad idea, oil catch cans are pretty cheap.. pick one up or even make your own.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
The honda crankcase breather is a POSITIVE pressure ventilation system.The air from the intake blows into the valve cover. It is NOT a negative pressure ventilation system...it does NOT suck air from the valvecover to the intake.

Breathers remove the source of positive ventilation that repressurizes the POSTIVE CRANKCASE VENTILATION (PCV) valve.

There is less pressure in the crank when you add a breather at the valve cover. The consequence of this is you get more positive blow-by from the combustion chamber past the piston rings and into the crankcase. More blow-by means less cylinder pressure...less cylinder pressure means the burn is slower and less complete...the result is more emissions and less power.

If you want to do this right and remove oil vapor from the circulating crankcase before it goes into the intake valve then, get an oilcatch can and put a breather on the catch can. Then place the catch can in between the valve cover breather and the PCV valve.

Disconnecting the breather tube, which blows fresh intake air into the valve cover, and placing a breather on the valve cover just creates more blow-by and emissions. Eventually you have so much blow-by, you lose power.
</TD></TR></TABLE>

 

Alright it seems I was actually wrong about the tube on the valve cover. Blow-by vapors are blown out of the engine block, through the PCV valve and into the intake manifold. Apparently that tube on the valve cover does suck in fresh air from the intake.

In that case I guess you would not want to use it w/ a JRSC since the increased vacuum in the intake pipe might pull air out of the valve cover, instead of air coming into the valve cover like it should.

I don't know, maybe I have no idea what I'm talking about and you should just ignore me.

 

The way I understand it, the blowby recirculates is supposed to do just that...recirculate. It isnt detrimental, and having a breather filter on there does nothing aside from not allowing the air to recirculate. A catch can would be ideal I imagine, but the small filter does nothing.

Im not sure specifically how it would react with a JRSC differently...it would seem to be the same unless someone had specific information otherwise. Thats a good question to ask someone with extensive JRSC knowledge, like CRVRX ,Sonny, JRCivic, etc. They can apply what they know about JRSC's to the difference with the breather filter on an NA/FI motor. I dont see a need for it with or without a JRSC, personally.

 

A breather on the valve cover for JRSC cars is a really simple way of preventing oil from being sucked out the valve cover under boost. Without the breather, under boost the intake would act like a venturi fitting and siphon oil out the valve cover due to the high amount of air flow through the intake.

Since the crankcase gases is supposed to be evacuated through the PCV valve the breather should be adequate to allow fresh air back into valve cover. A catch can is a plus to put in between the PCV valve and throttle body to further remove oil vapor from the intake track keeping the intake manifold cleaner from oil build up and possibly reducing possible detonation since oil vapor mixed with the air/fuel mixture reduces it effective octane rating. This is how I understand it, please feel correct me if I'm wrong.

 

Yea like everyone else is saying, the hose that is normally there is used so the vapors can flow inside of the intake arm. Either you need to clean that arm out everyone once in while if you have a breather or need a oil catch can or something.

 

Im running a catch can in my set up.

 

The tube between the intake and valve cover, or a breather filter if so desired, can still be used along with a catch can. The catch can is mounted between the PCV valve and the intake manifold, and isn't part of that breather tube.

 

Maybe if you have enough blow-by that oily air flows back out towards the intake duct, a catch can in that line might help.

The PCV line already has that box/baffle/thing on the back of the block. Normally a catch can just supplements that to catch whatever oil gets thru that thing. But the breather line doesn't have any baffles in the first place.