the same thing can prob be bought localy for $5

http://www.tgilmore.com/talon/catchcan.html

$2.98 local


jim

The difference is this one vents to the atmosphere instead of recirculating back into the intake.

There is a reason for venting back into the intake- vacuum.

PCV- Positive Crankcase Ventilation- you get pressure in the valve cover/block- crankcase- and it's not good- you want to relieve it - the stock setup-

The PCV valve is 'supposed' to be a one way valve - air can come from the valve cover towards the intake, but boost isn't supposed to be able to route back from the intake into the valve cover (more on this later). Off boost, the intake is under vacuum, this vacuum sucks both from the TB inlet- and the PCV nipple. This helps relieve the pressure in the crankcase, causing rings to seal a bit better, caustic fumes to be decreased.
But where is the air coming from in the crankcase once it's being sucked for a bit? That line from the inlet tube to the valve cover. That way the air is metered by the filter, and it's clean- and as long as it's being sucked in it will have lower pressure which is similar to vacuum for sealing etc...

The issue isn't off boost- off boost you're PCV valve is what is polluting your intake plenum and ports. It's while boosting that you have an issue- in a perfect world- the PCV valve slams shut, sealing boost in the plenum, and the turbo starts sucking air- this time the air from the valve cover to the inlet. This is when oil comes thru and starts contaminating things.

Okay- so now you see how things should work- now for the mods and why they might be bad.

A) venting to atmosphere at the VC to inlet hose- this would seem good - no oil in the intake tract, IC piping etc... what's bad? During that boost period- any excess pressure in the crankcase will be vented out- resulting in less pressure in the crankcase, but not actually negative pressure or vacuum. At best you have 0 pressure, or bleeding off to 0 pressure- no air from the PCV valve, and there is no sucking on the hose since it's just open air.
B) that PCV likely is bleeding air under boost- causing positive crankcase pressure- less effective ring seating, higher chance for blowing out seals and the dipstick- more pressure pushing oil thru that VC to inlet hose.

So solutions?

1) Catch can on PCV to Intake and on VC to inlet. This would allow the system to work normally- you might still have pressure bleeding thru the PCV under boost- but the oil should be lessened.
2) Krankvent (www.krankvent.com) which is a higher pressure one way valve- allowing similar PCV operation but without the leaking of boost.
3) Krankvents with catchcans - no boost, no oil, efficent operation- high cost.

DIY method- run the fuel filter catchcans with larger brake line one way valves- test one way valves often to insure no leaks.

That isn't for the PCV, it's for the crankcase vent.

If you want your engine coated with a fine layer of misted oil, it's ideal. If your motor's not a tossed salad, run the tube back to the intake where you'll have just a smidge of vacuum to help draw off the fumes. If you use the gilmore tank above, it'll stop almost all the oil vapor from coating the turbo and IC tubing.

http://www.dejontool.com/dsm-cip-faq.htm

Q: Do I need the Valve Cover Vent tube on my new intake pipe?
What does the small hose from the valve cover do?

A: As pressure in the valve cover builds from boost pressure leaking into the engine, this tube vents it into the intake for a "closed system". Unfortunately oil from inside the valve cover comes with the air and lines the whole intake system. It collects in the Intercooler and degrades cooling, fouls the throttle body and collects in the intake manifold also. If your engine is in good shape you can remove the hose and put a small air filter on the intake tube (like our K&N VCV filter ($17.95) which can be cleaned and reused) or order an intake pipe without this tube. If your engine puts out alot of oil, you'll need a catch can. Drivability and performance will not be effected However you will be defeating emissions (which is illegal except for offroad). Do not plug the hose or install a fuel filter as the backpressure will impair venting.

So is it ok to use a fuel filter or not? Wouldn't be suspicious if they hadn't mentioned they sell an $18 filter right before saying not to use the $3 solution.

Id just get a catch can...