Having little knowledge of engines myself i had to put this question out there, i've heard about other cobalts having problems with the crankcase and it causing the dipstick to pop out and thus making a leak.......any ideas?? I know i've seen multiple cars that have crank case breathers and it seems to do a good job.

 

If your dipstick is popping out, you have a much bigger problem.

 

completely false.

its probably not a bad idea. however, i havent heard of any lnfs doing this . only the lsj. the problem was building up too much crank case pressure, bad intake mani gasket or somthing much worse. i dont think you have any of that to worry about.

 

ive had two cars come to my dealer, One is there 2day actually, both stg 2 lsj and the first one we replaced the pistons . This one where probly gunna do the same but dont know we havnt pulled the head yet. i have not heard or seen any lnfs with dipsticks blowing out.

 

the crank case breather is hooked up to the intake if im correct and mine has broke 2 times but no dipstic problems

 

The crankcase tube is normally connected to the intake system, so at wide open throttle any excess pressure/oil vapor is sucked out as fast as possible. I don't see how putting a little breather filter on there is going to fix anything, its probably going to make it worse since there's no vacuum assisting in pulling anything out.
Putting a catch can in between is a better idea, but it still has to be connected back into the intake for it to work properly.
The crankcase tube is connected on the compressor housing of the turbo, a 10mm bolt holds it in place.

Thats the crankcase inlet port, it sucks in fresh air, the outlet port is connected to the turbo.

 

I broke mine too but I'm holding off on fixing it untill i get Hahn's intake. I hope waiting doesn't cause any problems

 

my dealer mechanic said its not a good idea to drive around when it is broken because its getting unfiltered air but i dont think its that big of a deak

 

I just ordered my air intake from Hahn yesterday so it won't be long before i fix it. I should have my Blazer back on the road soon also so i won't be driving the balt that much untill the warmer weather gets here and all the salt goes away.

 

these cars have a PCV system for this (as do most all other cars) and they work much better than a simple filter breather

 

me and boostking run dejon's intake. but we are using a vent. as it seems with alot of boost and such. it just coats the intercooler and sucks some oil. and thus causes things to not cool down

 

......explain further

 

It is kind of a big deal because not only are you sucking unfiltered air into you motor you are sucking air in after you MAF. That will really F up your fuel trims as the ECM will add fuel when it your oxygen sensors pickup the change in A/F. I know this for a fact because I had a catch can on my GTO and one day while I was logging data MY catch can came loose and the hose popped off my fuel trims went from from -2.47 to +20.00 the ECM was adding 22% more fuel to compensate. You will kill your gas milage and you cats wont like it either as they will be running about 400* hotter than normal.

 

The problem is that people are using gauze breathers, and you can't do that the way the crankcase vent is positioned, you have to use a stainless steel filter element only. No gauze.

 

Correct. I don't think people realize that allowing the crankcase to be open to the atmosphere creates an intake manifold leak through the PCV oriface in the head. It also causes pretty wild air/fuel ratio swings when ambient temperature changes at WOT with PCM's using factory narrowband O2s. The LNF will make up for it using the OE wideband but then you increase the chance of limp mode.

 

Not to mention your cruising gas milage will suck majorly until you fix it.

I still believe that a well sealed catch can is the way to go. The vac from the intake helps stabilize the crankcase pressure better and helps clean out the unburned fuel and oil vapor that accumulate. I tried a breather kit on my GTO and I plugged everthing else off on the intake. It seemed to run sluggish and bogged a lot and my cat temps were about 200-300* higher than normal and my fuel trims went from -2.47 to -6.0. It worked out a lot better with my catch can on IMHO.

 

http://www.pfyc.com/pc/GN3020/GPUNDE...+LS1,+LS6.html

 

the lnf cars do not need them.

lsj cars however. when higher boost levels are being hit {20+} and stock rings are being used. the stock line on the valve cover can not relieve enough pressure to keep things happy and bad things happen.

i have a catch can on my car. my fuel trims never stray more than +/-2 on any cell. fuel trims will stray a bit with a breather. depends on how close the tune is. most people do not care to take the time when messing with someone else's car to hit all the cells they can to get the maf in line to get away from random problems associated with the breather.