What is this inlet/outlet on my 20v? [pic]

**Wanabe_Garage** · 19-04-2006, 02:45 PM

Maybe you guys can help me on this. I just need to know what this inlet or oulet is for...

thanks

**YLD-16L** · 19-04-2006, 02:59 PM

Looks suspiciously like a crank case breather.

**monkeymajik** · 19-04-2006, 03:28 PM

Originally Posted by YLD-16L

Looks suspiciously like a crank case breather.

If it's like other 20v's I've seen then yes.

**Dimitri** · 19-04-2006, 03:29 PM

its an outlet. and yes its a breather. hook it up to a catch can. or T it into the brether line that goes from the intake cam cover to the middle of the throttle vacume chamber.

**Wanabe_Garage** · 19-04-2006, 04:57 PM

Oh i see...

so oil catch can... or T fitting between the cam cover to throttlebody?

With the oil catch can, can you install like this?

can you leave the breather open or have it blocked?

thanks

**AE86slut** · 19-04-2006, 05:20 PM

I put a K&N filter on my 20V breather. Worked fine as far as I could tell.

**Wanabe_Garage** · 19-04-2006, 05:37 PM

==========================
Those are the hoses that vent crankcase pressure that’s caused by piston blowby (small amounts of air/fuel mixture that gets past piston rings into the crankcase).

All engines have blowby and it will pressurize the crankcase if its not vented somewhere. For many reasons all manufactures vent these gasses back to the combustion chamber through a PCV valve to be burned. The problem with this is that it reduces combustion efficiency and coats the entire intake tract with oil.

The common solution for this by many enthusiasts is to connect the hoses to a little Filter (thats the little K&N filters u see on some peoples engines) and cap the PCV valve thereby allowing crankcase pressure to be vented to the atmosphere (engine bay) and keeping the intake tract clean , but this tends to spread oil all over your engine bay instead

A more elegant solution is to use an air/oil separator (catch can) instead. You mount the can somewhere in the engine bay. Run the hoses from the breathers to it and then a return line to the PCV and intake as the factory does it. Oil collects in the catch can (where you can drain it periodically) and your intake and engine bay stays clean

All engines can benefit from this doing the above but it helps turbo and supercharged cars more as they tend to suck oil from crankcase breathers at a higher rate, especially if you turn up the boost pressure.
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posted on a different forum

**Dimitri** · 19-04-2006, 05:55 PM

if youre going to use a catch can, block the inlet on the manifold.

**Wanabe_Garage** · 19-04-2006, 06:08 PM

yeah that sounds about right

dimitri rep up

**andy** · 20-04-2006, 11:55 AM

damn, that hose has a big arse bolt in it(ei: its blocked) on my silver top.

any probs with doing this(blocking it off)?
should i really go and get a oil catch can?

**Wanabe_Garage** · 20-04-2006, 02:15 PM

Originally Posted by AE86slut

I put a K&N filter on my 20V breather. Worked fine as far as I could tell.

I think that would be ok... like ae86slut said. There was a website somewhere where they made a catch can out of an ordenary can like a milo can... get that hose to go into a milo can.

**AE86slut** · 20-04-2006, 02:20 PM

Originally Posted by Wanabe_Garage

I think that would be ok... like ae86slut said. There was a website somewhere where they made a catch can out of an ordenary can like a milo can... get that hose to go into a milo can.

Yeah, you could do that too I guess. I can confirm that just with the filter, I never got any oil or anything spraying out around it.

**terra** · 21-04-2006, 05:50 AM

efi motor, vent pcv to atmo = air leak essentially. another good reason to return it is because the airs already been meterd by whatever afm/map you have, and letting it escape is not such a good idea.