Quote:
|
Originally Posted by DJPimpFlex
I dont get why you would run leaner. The air thats comming from the PCV has already been meatered at the MAF so removing that air source would make you run richer. (correct me if I'm wrong). Also I dont think theres a valve that opens and closes in the valve cover. I just took it off and replaced the seal, thats how I know. Under boost it will get sucked out, but it doesnt NEED to be as far as I know. The pressure caused by the pistons going back down and pressure comming back up the front cover will all get releved through the valve cover and then move to the catch can naturally. I dont see how removing air from the intake is going to make more pressure in the crankcase. I run mine open and havent noticed any problems so far. More input please. I'm not an expret, but this is how it makes sense to me. Also the ECU will compinsate for the "leak" after a few days I believe.
|
The pcv pulls fresh air from the intake and uses it to suck out air from the crankcase and into the intake manifold, if you leave this hose unattatched you are actually pulling in air which is now being un-metered, this causes a lean situation i believe. The pcv valve is the valve which opens and closes in the valve cover, it is open under vacuum but once you boost it closes so that the crankcase will not be pressurized which is where the breather side comes to the rescue and now relieves the pressure. The pressure
will relieve itself on its own but instead of it being drawn out the piston and crank movement have to force it out causing excessive wear, and possibly oil consumption. Basically the crankcase now becomes a low pressure compressor. Honestly though im not sure if the computer does compensate for the leak, i would think it would via the air/feul reading of the O2 sensor. You say you havent noticed any problems yet though, not even more lag? I tried to put a breather filter on (which would be the same situation) and i noticed a crappy idle, and more lag right away, thats when i learned about all of this and put my breather hose back on. i believe ive answered all of your questions but if anything is unclear just ask.
-Phil