Why do some catch cans have a breather?

The catch can is simply a place for oil and oil/vapor to go, instead of back into your intake. The reason people are using a filtered breather is to keep oil/vapor from condensing inside of their engine bays. The catch can is simply a place for oil and oil/vapor to go, instead of back into your intake.

Do I need a PCV if I have a catch can?

Since the oil catch cans condense the vapor portion of the gasses, they will need to be drained periodically of all the oil, fuel and other contaminants. A PCV (Positive Crankcase Ventilation) system exists to help counter this problem and expel the gases out of the crankcase and back into the intake manifold.

Can you vent catch can to atmosphere?

An IE catch can is a must for anyone looking to prevent crankcase oil blow-by and fumes from condensing and filling your turbo piping, intercooler, and intake manifold. The IE vent-to-atmosphere billet catch can is designed to catch all of the oil fumes and gunk omitted from the factory engine breather systems.

What is a breather vent?

Breather vents are used for vacuum relief or pressure equalization on cylinders, gear boxes, oil tanks, or reservoirs and prevent foreign particles from entering ports open to the atmosphere.

Can you vent crankcase to atmosphere?

The downsides are obviously environmental issues, and you will lose some helpful vacuum on the crankcase but since you’d be wide open to atmosphere you’ll quickly blow off any positive pressure in there. If you run a long enough hose you shouldn’t have any problem with anything coming back through the tube.

Do catch cans increased crankcase pressure?

A catch can system is a cost effective solution to preventing higher crankcase pressure associated with increased power, building up due to lack of ventilation. Additionally it will prevent components from being coated in a film of oil and sludge.

How does a baffled oil catch can work?

What the Baffled Catch Can does is place a filter or series of baffles in between the PCV and the intake. With the filter or baffles, the catch can separate the oil/gas/air blow by mixture, trapping the oil and contaminates, while it allows the cleaner air to pass through, drawn by a vacuum into the intake.