pressure in crankcase?
 

i got all my turbo ---- on yesterday after about 12 hours, i built all the press bent piping my self, very happy with all of it, i havent driven it yet due to snow and not getting the downpipe on :( anyway, when i built my charge piping i welded a fitting onto my upper pipe and just put the crank case vent tube on it, a friend says that when im in boost it will be bad to have pressure going back into the crankcase :( do i need to take that back off and cap the fitting? it looks so damn good to >:(........

Re: pressure in crankcase?
 

come on people....what will happen if i leave the vent tube hooked back into the charge piping, anything? nothing? good? bad?

Re: pressure in crankcase?
 

plug it and use a catch can

Re: pressure in crankcase?
 

not the answer i was looking for ::) i want to know if it will cause damage to leave it hooked up to the charge piping.....

Re: pressure in crankcase?
 

you'll be blowing all the seals out...think about it...

Re: pressure in crankcase?
 

its bad because you are pressurising you crankcase and in time you will ruin your ring lands, get a catch can.

http://www.beesandgoats.com/boostfaq/PCV_turbo_1fit.jpg

"The valve cover fitting has a breather filter on it. Air flows through the crankcase and out of the PCV port which now has a plastic 90* barbed fitting in it (no PCV valve). From the PCV port, the air flows into the side of the catch can and out of the top of the can. Air then flows back to the pre-turbo intake pipe. A 90* fitting is not required here because air flowing across the opening of the fitting in the intake pipe will draw air out in the direction of air flow (the same reason water comes out the top of a straw when it is submerged in a glass of water and you blow across the top of it).

This routing is not a closed circuit system with the only drive for the system being provided by vacuum."
G2IC turbo guide.

Re: pressure in crankcase?
 

vent the valve cover into the atmosphere. plug or make a new upper charge pipe.

end of story

Re: pressure in crankcase?
 

Well to vent the crank case best your gonna need the catch can. attach it to where the pcv valve was and attach the other end to a vacuum source. But my question is...... where would be a good vac. source for it?

Re: pressure in crankcase?
 

did you not see the pic up above. ::)

Re: pressure in crankcase?
 

dont recirculate the catch can breather to the turbo inlet, get a breather, turbo cars can detonate if they have the crankcase gasses come back into the air/fuel charge, it severely lowers the octane of the incoming a/f charge.

Re: pressure in crankcase?
 

the whole reason of the PCV is to vent the crankcase and DECREASE the pressure inside, high pressure could casue fucked up ring, blown oil seal blah blah..


you should plug the one on the charge pipe and vent the crankcase like the dirgram up there.

Re: pressure in crankcase?
 

Well I did read the diagram but Im not a big fan of recirculating that air back into my engine. would it vent the pressure if you just left the catch can without a vac source and vent it to the atmosphere?

Re: pressure in crankcase?
 

yes

Re: pressure in crankcase?
 

Let me understand this cause I had it hooked up like this I think but i removed it. You can have a line coming from the PCV port and into a catch can? and thats it?

Also what are people using in there PCV ports to conect a vac hose?

Re: pressure in crankcase?
 

if it is venting from just the atmosphere then you wouldnt really need a catchcan would you? i thought its purpose was to prevent oil from circulating into the intake? theres a good chance im wrong but this was my understanding.

Re: pressure in crankcase?
 

I got it now. Im just gonna hook a catch can to the pcv and get an electronic vac. pump from moroso and get my vac like that