Pcv, catch can

[Danza V :D]

I was going to replace my pcv but then though hang on il take it out and put a catch can in.. When you remove the pcv and grommet is it threaded cause a lot of catch cans come with the unions which the hoses goes onto.. Will it be ok and fit a pipe on there with the top mount on??

 

[Nippon]

No its not threaded.
You will need to weld an aluminium fitting onto the rocker cover.
You will also need to block off where the PCV hose goes to the inlet manifold as well.

 

[Danza V :D]

That's weird I saw one on Internet for glanza which had threaded unions. Probably not for glanza..

 

[Danza V :D]

Just I've finally found that out to be my cause of headache.. To save me buying one can I just put a breather filter over the pipe coming from the pcv valve and just block the intake part? Will it still work the same or does the vacumm from the intake cause if to open ?

 

[Danza V :D]

Can you block the pcv piping and inlet, I'm already venting to atmosphere with a breather??

 

[Nippon]

No dont block off the PCV. It needs the vacuume from the inlet to open.

The 4EFTE cam cover has 2 breathers. One on the left between the spark plugs and one on the back right which is the PCV valve.
You can put an open fliter on the breather on the left or put a catch can there.

If you want rid of the PCV then you will need to convert your cam cover to a race spec one using this tutorial:
http://www.toyotagtturbo.com/forums/showthread.php?100166-DIY-dual-breather-cam-cover-how-to-)

You shouldnt need to do this unless you are running reletively high levels of boost.
The PCV doesnt open under boost which is why people make race spec cam covers.

Be aware that if you follow the tutorial above you will need a catch can that has a breather. Not a sealed unit. If you use a sealed unit catch can the head wont be able to breathe at all.

 

[Danza V :D]

My idle is jumping about all over shop when on first start up and I've looked at everything else and just wondered whether to block it.. Could you just put z breather on the pipe from the pcv? Not contradicting you Nippon :? Just curious. I'm not running high boost and Wong be going for high boost for awhile.

 

[Nippon]

If u put a breather on it then it wont open so no point doing it really.

 

[Danza V :D]

Just noticed my cover is leaking do I may aswel just replace the pcv

 

[scgtt]

Leave the pcv valve in and run a pipe from that to one on the catch can,then run a length of pipe back to the inlet manifold from the other outlet on the catch can.should work a treat.

 

[Danza V :D]

Then your sucking oil into the intake manifold?

 

[Rev]

Option 3 > The more correct way - Move the pvc to the inlet put one tube from pcv to catch can the other tube goes from catch can to breather. Catch can to be in a cool spot, pcv valve to slope down sufficiently so it still opens by gravity.

 

[scgtt]

With the pcv valve in the stock position you will suck oil into the intake manifold,only blowby gasses will be sucked into the intake manifold if the catch can is positioned lower than the pcv valve any oil will stay within the catch can.

 

[Nippon]

If u connect catch can to pcv and inletu will need to use a sealed unit otherwise it will cause vacuum issues.

 

[scgtt]

The catch can on mine is a sealed unit,i also have a filter on the left outlet on the rocker cover,ive had no problems so far.

 

[Danza V :D]

So basically in a nut shell. Block the inlet port- run a pipe from the pcv to the catch can and then run the other to the left hand side of the rocker cover where a breather would be? How would the pcv open then if there's no vacumm? Just I think mines stuck open causing my erratic idle and j don't fancy paying Toyota prices for something j can sort with a catch can..

 

[scgtt]

Danza read my first post again,do it that way,then you dont have to mess about with your rocker cover,it works fine on my starlet gt.lf im wrong then surely it wouldnt run/work right.

 

[Nippon]

Ok. Lets clear this up.

Option 1: Keep PCV in place. Run hose from PCV to catch can. Then hose from catch can to inlet. use a sealed unit catch can.

Option 2: Run hose from Rocker breather to catch can. Then remove PCV and run hose from where PCV used to be to catch can. Block inlet port. Use open breather catch can.

MD

 

[Danza V :D]

I blew through the end of the pcv hose and Incan open and close the little plunger inside so it ain't sticking but I noticed that u can turn the pcv 360 degrees, should it be this loose??

 

[weeJohn]

Dont want to confuse the issue here, but on the "race spec" set up, does boost pressure not pass through the can and piping into the crank case?