PCV versus oil catch can and breather??

[robbo_yobbo]

I have been hacking away at the intake system lateley and ended up replacing the stock intake piping which left me with no plug for the crank breather hose at the back of the rocker cover.
This was all good as purchased an oil catch can instead and fitted a little breather filter to the lid and hooked the breather hose from the rockercover up to the catch can.

Question is though, for the sake of tidying up my engine bay can the hose at the front of the rocker cover that the PCV hooks up to be connected the the breathable catch can too without causing any issues??

If so do I have to replace the valve with just a straight through hose??

My car started some funny business when the PCV hose got disconnected once but on the other hand Ive seen other cars with the PCV running straight to a catch can before, so why does mine rev funny when its disconnected from the inlet manifold, yet other cars run fine when its hooked up to the catch can??

Cheers.

[Sledgehammer]

Disconnecting the pcv and leaving the holes open will affect the vaccum and therefore the idle so you will need to block these off, a catch can can be connected to the valve covers.

[robbo_yobbo]

Ok that makes sence, shouldve figured that one myself.

Now from there, the other end of the PCV hose where it connects into the manifold, its on a t connector with another vacuum line. that vacuum line runs to a black box under the front left hand wheel arch which has 3 vacuum lines running to it - whats that box for and whats the vauum line for?

Cheers

[JC]

What car are we talking here? I6 or V8? I assume it's an AU?

[bodes-sh]

Originally Posted by robbo_yobbo

Ok that makes sence, shouldve figured that one myself.

Now from there, the other end of the PCV hose where it connects into the manifold, its on a t connector with another vacuum line. that vacuum line runs to a black box under the front left hand wheel arch which has 3 vacuum lines running to it - whats that box for and whats the vauum line for?

Cheers

the other box it the carbon / charcoal cannister, this is what the people with v8's keep complaining about it ticking all the time, the vacuum line is so it can purge fuel vapours into the intake manifold when there is too much pressure in the system...i think

[robbo_yobbo]

Yea, AU I6

[robbo_yobbo]

Ok, where are the fuel vapours comming from - ie where do the other 2 lines that run into the canister run from.

Besides legalities (Im pretty sure most of the mods to my cars arent legal anyway), what would be the sideeffects of just disconnecting the pipe at the cannister? so I can just put a screw in the manifold? any harm done?

Im assuming that in any boosted aplications that it cant be run into the manifold anyway so what would normaly be done in these circumstances?

Cheers