pressure in crankcase?
03-13-2005, 01:03 PM
#1
1.5 BAR
Thread Starter
Join Date: Nov 2004
Posts: 820
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 
........
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 ........
i want to know if it will cause damage to leave it hooked up to the charge piping.....
03-13-2005, 02:36 PM
#6
1.0 BAR
Join Date: Nov 2004
Posts: 319
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.
"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.
"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.
03-14-2005, 11:43 AM
#8
0.0 BAR
Join Date: Dec 2004
Posts: 43
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?
03-14-2005, 11:54 AM
#10
3.0 BAR
Join Date: Jan 2003
Posts: 4,438
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.
