PCV Valve / Rocker Cover Breather

J

JoshFlinn

Fresh Recruit
rocker cover breather

Hi guys I'm new to the site, I have an ep82 and i have just modifoed it with a catchcan. Its got two pcv valves one on the way into the can and one on the way back out to the air intake. On the rocker cover I have a breather but it keeps spitting oil through it onto the engine bay. Would extending the hose in line to the air scoop and putting the breather on that help?
 
Turboelvis

Turboelvis

Member +
If u have a breather filter on rocker cover it will fail mot
that's what I've been told anyway..it's venting to atmosphere!!
Has anyone had there catch cans installed and
passed mot.
 
Aidan@EP-styling

Aidan@EP-styling

Trader
Turboelvis said:
If u have a breather filter on rocker cover it will fail mot
that's what I've been told anyway..it's venting to atmosphere!!
Has anyone had there catch cans installed and
passed mot.
Click to expand...

Yes it shouldn't pass MOT but as far as I know 99% of them pass anyway. Probably due to the tester not spotting it.
 
Turboelvis

Turboelvis

Member +
Could both breathers on rocker cover not be tied in together(T piece),then in2 catch can and have outgoing pipe back to inlet with pcv on it
same as we johns etc but nothing venting to atmosphere..
 
danturbo4311

danturbo4311

Member +
You could but then you would have all the fumes from the breathers going back into the inlet mani & back into the engine, also when your engines on boost/ positive pressure you wont have a vacuum therefore you wont have a breather.
 
S

Steve GT

Member +
sorry to bump this topic back up but after looking at all the ways to do a catch can im guessing my way is really wrong

i got the standard pipe running from the inlet manifold to the rocker cover and all i did was ran one pipe from my catch can to the big rocker cover breather point. is this having no effect at all then?
 
Rory

Rory

Lifer
If you have hooked up the standard breather port to a vented tank then the tank will do its job of catching oil vapour
 
S

Steve GT

Member +
i dont think the tanks vented though its just an oil catch tank with one pipe running to the breather point on the rocker cover
 
Rory

Rory

Lifer
Disconnect it now!!

If the engine cant breath, it will presurise the crankcase, ie not good.

Throw up a pic of the way it is just now.
 
M

mork

Member +
It's very simple. The pipe that comes off the PCV valve (top right of rocker cover) into the catch can, then run a pipe from the other outlet on the catch can back to the inlet, where the PCV hose would have gone...seemples!
 
2

22222

Fresh Recruit
can anybody say something about why the can pressurizing must be avoided?


weeJohn said:
DSC00246.jpg


I use 2 pvc valves so as the valve nearest the inlet mani closes under boost, preventing the can getting pressurised.
Click to expand...
 
D

D34dly

Member +
Hello,

I welded 2 adapters in de rocker cover like this :
DSC00599.JPG


And got some elbows for it :
DSC00601.JPG


And want to make it like this :
OCC-221.JPG


Greetings,
Jeroen
 
Last edited:
clarkytrd

clarkytrd

Member +
Can someone confirm if the above is the correct way of doing it?!

Read the past ten pages and everyone has a different opinion on how to fit it.

Must be only one way to fit it, the right way!?!
 
glanzadude

glanzadude

Lifer
^^^^ This is the right way of doing it END OFFFFFF......
weeJohn said:
Thats the whole point of a catch can mate, when the vented gasses pass through the catch can the vapours are "dropped" in the can to prevent them going into the inlet.

Not 100% efficient, some vapours will still get through, but the majority wont.

Gee in my opinion your set up is wrong. There is nothing in your set up that will remove the vapours from the crankcase into the can. Have you ever had to empty it?

This is my setup, please dont think this is a way of showing how yours is wrong as its different from mine, this is the way I do it.

DSC00246.jpg


I use 2 pvc valves so as the valve nearest the inlet mani closes under boost, preventing the can getting pressurised. The valve in its normal place stops anything in the can being sucked back into the crankcase. The breather filter does as it named, its on the other pipe off the rocker, where the standard dump valve hose was connected.

I get an emulsified oil in my catch can, like a melted bar of fudge.

I empty it about every 6 months, the ammount in it varies.
Click to expand...
 
clarkytrd

clarkytrd

Member +
This is the first one ive seen done like this.

Every other one ive seen has been run off the rocker breather and the other off the pcv valve.
 
glanzadude

glanzadude

Lifer
clarkytrd said:
This is the first one ive seen done like this.

Every other one ive seen has been run off the rocker breather and the other off the pcv valve.
Click to expand...

Well that is the way TOYOTA made the engine.The way it is showing ^^^^^ is the same way but only the add of a PVC and catch can in the same hose going from inlet to PVC on engine...I don't no why people blocks of the hole on the inlet and soooo on... Keep to the plan, Toyota did that for a reason like........
 
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