+1, I run a breather in the location I specified w/ no more issues.

 

*sigh* it will cause a vacume leak....the pcv is a closed loop system and when you open up one end of it with a breather...big vacuum leak. The only way to add a breather and not create a leak would be to eliminate the PCV.

The reason why the PCV works with out causing a leak is because of the breather hose attched to the intake tube from the vavle cover, keeping it closed loop, using only metered air. Air sucks in thru the vlave cover breather hose from the intake, out thru the PCV, back into the intake...

 

It absolutely WILL cause a vacuum leak. Being tech certified, I would imagine you should know this. You can even measure it on a vacuum gauge. And it IS on the intake side. Look at how the PCV system works and the direction of airflow (working backwards)

The PCV valve is connected to the upper intake via a vacuum line (obviously.) The air that's in th crankcase is the air that gets sucked back up through te PCV valve and into the upper intake. And air that is in the upper intake, goes through the lower intake and into the cylinders.

Now looking back at the crankcase... it is the same airspace / shares the same air as ht area under the valve covers (that's pretty obvious as well.)

So if you add an open element breather to a valve cover, the upper intake sucks air through the PCV valve, which gets air from the crankcase, which gets air from under the valve covers, which gets air from the engine bay through the open breather. Since that air is entering the engine after the MAF, it is not metered and the computer does not know it is there. How can you say that is not a vacuum leak?

Is it a HUGE leak? No it isn't and most of the time it doesn't cause problems. But that entirely depends on your engine and setup. But it is definitely a vacuum leak.

Like i said, you can often see it and measure the difference on a vacuum gauge.

 

I know you run a breather, but I thought that you actually had your PCV system disconnected. Didn't you disconnect the vacuum line from the upper intake? I thought you had it venting into the atmosphere instead of running it to the upper.

 

Thanks for backing me us Sam

 

are u locking the dipstick tube in and makeing sure its tight. stick it in and turn it towards the header. at least that what mine needed, i have equals so i couldnt bolt it back on. and at first i thought the stick just sat in there it took me a long time and a lot of wasted oil before i figured out it locks in there. hope it helps

 

For $60 a Header Evac system is the way to go and you pick-up
some horsepower

 

The PCV is a controlled "vacuum leak " applied to the crankcase, if you have a PCV and use an open breather.....the source of air for that vacuum leak will be unmetered air (the MAF did not measure it), so it becomes the equivalent to a vacuum leak in terms of A/F control. If you source the PCV vacuum draw from the metered air after the MAF (OEM setup for a Closed PCV System).....it will not affect A/F control b/c the system has already measured for it and uses it in the combustion process, but it is introduced to the CC's via the PCV valve-intake route instead of the throttle body.

Bottom line.....a functional PCV system (valve with vacuum applied) and an open breather, IS a vacuum leak. If no vacuum is applied to the PCV valve/crankcase.....open breathers are not a problem....but you shoudn't use an Open PCV System setup in EFI systems.....they were not designed for it......and it could become expensive in the long run.....you might want to check this little experience.

 

+1. Basically same thing I said as well. No matter how you look at it, you're letting unmetered air into teh engine.

 

wow iddint mean to start an argument lol
ill try and turn it ive just been pushing it in???
vacaum leak on the breather huh guess thats out..
thanks for the help guys!!!!!!!!!!!!!