I am still a little confused as how to do the plumbing on a Catch can. This is how I did it:

I T-ed off the breather with the black box (oil separator) to one side of the catch can. The other lead is ran through the manifold to create a vacuum.

Anyways, I tend to get a whistle (vacuum leak) when it is connected like this, but when I take off either the valve cover line or the black box line, it does not make a whistle.

One more thing, how come the black box is providing a vacuum as well, I thought the IM is supposed to provide the vacuum for the oil separator (black box).
So my question(s) are: (1)what is causing the whistle sound (2) is the catch can routed correctly?

This is in a 1990 CRX Si, with a b series motor, the catch can is a greddy. thanks for any input.

-Art


Modified by Art701 at 6:34 AM 10/22/2004

 

 

Hmm Im not to sure about your setup. I run the Z10 Setup I removed the black box completly.. Plugged the hole. Then unscrewed the HEX Fitting right above the breather hole and replaced with a hose fitting. Ran that hose to my catch tank and ran a hose from the valve cover to the catch tank as well. I think this is the best way to my knowledge to run a catch can setup on a B-Series..

 

have u ever had any problems with the Z10 catch can, i am lookin to get one, but just don't know which one is the best, how bout the greddy one, or endyn? Sorry to kinda thread jack

 

I use the Z10 cause I work for Z10 but there all good. One good thing is that the Z10 has the proper plug to close off the port on the block where the stock black box goes.. And uses nice fittings which we make ourself in house..

 

First, try searching more....cause you didn't do a good job.

Second, I JUST did this last night. I searched and found literally 20-40 topics on this.

Third, the PCV Valve is removed from the oil seperater (aka the black box). What some guys do is drill out an old PVC valve so it's basically an elbow rather than a valve.'
then connect a hose to that elbow to one end of the catch can. The other side of the catch can, install your pcv valve. connect a hose to that and route it to your intake manifold.

done.

 

Thanks for the response(s). I did search, I too found lots of topics regarding the catch can, but I don't know what is wrong with it.


Thanks for the pictures QUiKSR20


What do I do about the breather on the valve cover?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Art701 &raquo;</TD></TR><TR><TD CLASS="quote">What do I do about the breather on the valve cover?

</TD></TR></TABLE>
uh... nothing? Catch can doesn't have anything to do with the valve cover.

 

I run my one line out of the block to the catch can and my valve cover vent also to my catch can.

 

When I searched for 'catch can' people were actually routing it to the valve cover, that is why I am still confused.

 

this is the way the actual catch can was design for turbo cars not NA or Hondas
as I got two of them a Cusco and Z10 motorsports in mine build up

Cusco one is done the regular manner one line to the air intake tube and the other to the valve cover vent

Z10 one is done like QUIKSR20's set up through the block plugs


the way u can probably use this if ur set up ain't to big is one line going to the pcv nox and the other going to the manifold outlet

unless u like to plug up the one coming for the actual block and connecting the catch can tot he pcv box and the other to the other end of the pcv box and plugging up the manifold outlet, too

Confusinf ain't I.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Art701 &raquo;</TD></TR><TR><TD CLASS="quote">When I searched for 'catch can' people were actually routing it to the valve cover, that is why I am still confused.</TD></TR></TABLE>

That way is wrong.

 

no one on this forum has ever agreed with me on catch cans, but ill bother to write out my catch can advice and theory again.

the point of a catch can is to prevent oil vapor from entering your intake manifold.

oil vapors can come through the intake manifold by the PCV system via TWO locations: 1. valve cover vent. 2. PCV valve hose (breather chamber). this is the way it is designed for emissions purposes, instead of routing to air.

the first inlet on the intake pipe (right before the throttle body) allows the valve cover to literally breathe and vent off pressure. theres a lot of action going on in there, moving cams, valves and rockers. it just needs relief.

the second point of entry is to the top of the intake manifold after the PCV valve, originating from the crankcase. the PCV valve is a one way valve. it only allows pressurized air to EXIT the crankcase, and not allow air to enter from the intake. as it is originally designed, the vacuum created in the intake manifold helps draw the oily air out of the crankcase.

the PCV (positive crankcase ventilation) system is designed this way to allow the engine to breathe, preventing blowby through the piston rings and into the combustion chamber, while still being environmentally friendly by not releasing oil vapor into the air, or dropping oily moisture on the road.

you put the catch can to prevent oil vapor to enter the intake manifold by condensing the oil vapor into the catch can. to do so, you then should route BOTH sources of oil vapor to the catch can.

however, (its my belief) it is not necessary that there be any negative pressure on the back side of the valve for the PCV valve properly and allow the engine to breathe. it will release whatever pressure it needs to naturally. thus, the conclusion is that unless you REALLY care about the environment and not releasing oil vapor into the atmosphere then you do NOT need to connect the vacuum to the catch can by having it connected back to the intake manifold. just allow the vapor to condense in the catch can and vent to air (with a filter if you want). you can then just plug up the resulting holes on the intake manifold.

it seems a lot of ppl are confused about catch cans, whether they got their ideas from looking at some scribbled sketch off the internet from a crackpot or because they just want a shiny tin box they got off ebay in their engine bay with no instructions, but if you just think about the purpose of a catch can, its not that hard to figure out.

the way "real" racers ive seen put their catch cans together is just using a plastic oil or soda bottle and running two hoses into it from the PCV valve and valve cover breather, plug the holes and go race. if you want to keep the inside of your intake manifold clean and chance of pre-detonation down, this is all you need to do.

it makes no sense to route oily vapor back into your intake manifold.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by QUiKSR20 &raquo;</TD></TR><TR><TD CLASS="quote">I use the Z10 cause I work for Z10 but there all good. One good thing is that the Z10 has the proper plug to close off the port on the block where the stock black box goes.. And uses nice fittings which we make ourself in house..

</TD></TR></TABLE>

Hey bro,

Please get a hold of me via PM(on here) or e-mail. I need both the fitting and the plug. Sorry to bust into your thread but, listen to Tyson IMO he is correct .


Phil

 

Tyson- what is your view on plugging the block like in the picture?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jisu009 &raquo;</TD></TR><TR><TD CLASS="quote">Tyson- what is your view on plugging the block like in the picture?</TD></TR></TABLE>

just looks like he plugged the hole and opened up a new outlet to get rid of the stock breather chamber. shrug. the breather chamber is just loosely held into that hole, no threads, just an oring. oh yeah, and the stock breather chamber is honda's own version of a catch can, just doesnt do as good of a job of separating the oil vapor. so why bother with leaving the ugly thing there i guess.

let me add, im no engine expert. this is all just my opinion from what ive seen done and used on track racing and did myself. i dont have a problem sharing or discussing my opinion.


Modified by Tyson at 7:40 PM 10/25/2004