is there any benefit to adding a breather to the valve cover and capping the intake? or is it best to leave the line from the valve cover to the intake. Also... what do you use to cap the intake.

 

Ive see people put a breather on both ends (intake and valve cover). No benefit by adding breather just looks cool

 

on both sides? but the nipples on the intake and the nipple on the valve cover are different sizes.

 

actually, i think it's bad to have one. i think you're supposed to have a vacuum there and a breather eliminates that

 

you might wanna read this!---> http://www.team-integra.net/fo...sp#14 ......so, yeah....they're bad!

 

a vaacum line should be there to help ventilate vapors from the crankcase. having a brather there is functionally ok, but not smog legal. the vapors tend to dirty up the engine bay. when people go turbo and replace the intake with a charge pipe and bov. to my understanding they replace that line with a catch can.

when concerned about that info myself i posted this and had some great replys:

https://honda-tech.com/zerothread?id=946636


Modified by Medek at 12:56 AM 10/11/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sabotage7 &raquo;</TD></TR><TR><TD CLASS="quote">you might wanna read this!---&gt; http://www.team-integra.net/fo...sp#14 ......so, yeah....they're bad!</TD></TR></TABLE>

i disagree completely with that write up....

The intake provides a VACUUM and does not push air into the crank case.. If the person who wrote that knew anything they would know that if u put your finger on the nipple of the INTAKE it would suck your finger to it... not blow air like he said. The valve cover nipple releases air that is built up inside of the crank case. The intakes vacuum will help in pulling those gasses out of the crank case and thru the valve cover nipple.. then its fed into the combustion chamber then out the exhaust.

Having a valve cover breather on the valve cover is OK and will not cause damage. In fact you will see some people who install multiple hose barb type nipples on their valve cover to help release the pressure built up even quicker. which is a good thing.

 

This is what that article stated..

"There is less pressure in the crank when you add a breather at the valve cover."
Totally true.. Less pressure in the crank case = GOOD!


"The consequence of this is you get more positive blow-by from the combustion chamber past the piston rings and into the crankcase."
WTF? NO!...If you have LESS pressure in the crankcase you will reduce chances of blow by..More pressure in the crankcase = higher chances of blow by. Simple logic here people..


"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."
I dont even think this guy knows what blow by is.

 

Use a peice of hose for a fuel line or something and plug it to put it on the intake.
You can just weld it too.

Unless you live in a strict *** state the you won't have any problems with it.
Just lets vapors from the valvecover out through the filter instead of going through the intake.

 

SO WHO IS RIGHT????????????

 

honda is a big fan of emission class....and for their engine effiency

keep the hose connetcs to intake from valve...help reduces oil vapors, pressures, and emission...but those junk **** get recycle back into the head by the hose on the intake.

if the hose connected...intake able to suck more air out of valve....for better pressures inside valve...

if even you put a filter on the valve, it stills can release emission into the air..and this is why honda manufacturer decided to keep the hose...

disconnect the hose and replae a filter on the intake..give you air from engine bay...if you have cold air...i would personally just block that hose on the intake if you wish to not connect a hose between valve and intake

if you connect the hose between intake your valve pressure stabilizes better but you get some dirty pressure from valve back to intake..to IM ...to head...out of exhaust gas

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J337_UNIT &raquo;</TD></TR><TR><TD CLASS="quote">

i disagree completely with that write up....
</TD></TR></TABLE>


test take off the hose from intake to valve while idle the vavle's hole will blow air out of the valve..while intake hole suck in...hehe..

 

Ugh, so wrong on so many counts.

Do some searches on the subject, I have debated this against people who havn't bothered to do any tests or looking into fluid dynamics too many times to do it again here.

 

you're wrong, the valve cover takes in air from the intake arm. You'll know this when you put your finger on top of the nipple of the valve cover and you can feel the vacuum produced.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Black-LS &raquo;</TD></TR><TR><TD CLASS="quote">you're wrong, the valve cover takes in air from the intake arm. </TD></TR></TABLE>

That's what I've always thought too!