catch can on 20v silvertop

[rollas22]

Oil Catch Can in a 20v 4AGE Turbo silvertop

I know that i plumb the can off the rocker cover into the can then out to ???
thats the bit i would like to know where does it go after its entered the can?
a diagram would be great!

[Disco]

I had one, it's gone now


The can... is it a sealed one or one with a breather?

[Disco]

Basically you have 2 options..


If you just want to vent oil vapour from the rocker (thats the one that hangs out the side of the engine (that is currently venting into your intake just shy of the plenum) then just run it to there - that doesn't need to be sealed to work but you can plumb it back into your intake for vacuum purposes in which case it will need to be sealed to work properly but doesn't have to be.

If you want to vent your pcv valve to the can as well then you will need a sealed unit and run that from the pcv valve (the grey plastic thing to the left of your view) don't take it out or break it, they're like $70 to replace and run that to the can and then back into the vacuum line where it was plugged in before.

[matt dunn]

but you can plumb it back into your intake for vacuum purposes in which case it will need to be sealed to work properly

If you want to vent your pcv valve to the can as well then you will need a sealed unit and run that from the pcv valve (and run that to the can and then back into the vacuum line .

What's the point of that?
The vapours are still entering the intake.

The whole point of fitting a catch can is to prevent the vapous from going into the engine as the vapours have the effect of lowering the octane rating of your fuel, that is the vapours cause detonation.

If you are fitting a catch can run the pipe from the PCV valve into the can and there's one off the back aswell and run them into a can that has a filter or vent to atmosphere.

Matt

[Disco]

but you can plumb it back into your intake for vacuum purposes in which case it will need to be sealed to work properly

If you want to vent your pcv valve to the can as well then you will need a sealed unit and run that from the pcv valve (and run that to the can and then back into the vacuum line .

What's the point of that?
The vapours are still entering the intake.

The whole point of fitting a catch can is to prevent the vapous from going into the engine as the vapours have the effect of lowering the octane rating of your fuel, that is the vapours cause detonation.

In a silvertop 20v the chances of this happening are going to be virtually non-existant unless you have wound the dizzy all the way forward right? Even then, the knock sensor is just going to wind back the timing and life will go on.

and I thought about arguing with you here but I guess you're right..

I figured the can is designed to seperate the vapor (which will settle as oil in the bottom of the can) and then your much cleaner air will be drawn back into the intake... hooking it up to the intake will cause vacuum in the can and help draw air through... but yeah you're right..

pcv valve on the other hand does need to be connected back to the end of the fuel rail or at least that needs to be blocked off...

meh... tired... need coffee... :yawn:

[matt dunn]

Knew some one would have a comment on that.

A friend had a late mivec lancer race car and had all sorts of trouble high in the rev range at load. It ran an aussie ralliart ECU and after a lot of pissing around found the problem to be just that. Took the breather out of the intake into a catch can and fixed all the problems.

And it will happen to a 20V. Do you know that some points in the timing zones they run over 40 degrees advance on the live data and they do run a knock sensor.

Matt

[wde_bdy]

The only real reason to run a plumb back catch can is for emission purposes. A lot of countries do not allow you to run a vented setup to reduce polution. No requirement in NZ for this yet, so might as well vent it to get maximum performance.

Callum