Quote:
Originally Posted by Kingtal0n
Or avoid a catch can all together. A catch can is only for when the engine explodes magnificantly. Otherwise, its just "extra plumbing" that will lower the overall pressure drop experienced by your crank case.
If your engine produces so much vapour oily mess that you actually require a catch can just to run the car, then either you rebuilt the engine wrong (typical, actually) or it's very high mileage and nearing the end of it's service life, or the rings are toasted from poor tuning. Or there is an issue with a check valve.
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All this is not true lol.
Not trying to start anything but just saying you might wanna do some research.
Let's not take things to extremes.
Yes if you're filling up catch cans with oil then you obviously have a ring issue but a little bit of oil over time in the catch can is normal.
Capping off the PCV port will cause crank case pressure, especially on a boosted motor. Piston rings are not a perfect seal.
Here is the deal, most people look at these purpose built racecars and don't see a catch can on most of them. Those cars are only run for short periods of time and generally the oil is changed after each racing event. On a car that is driven regularly, it's best for your engine to run a proper PCV system for the reasons I listed in my earlier post.
I'm of the opinion that you should put forth the effort to do things right the first time to benefit your motor and piece of mind for yourself. But that's just how my opinion.