Originally Posted by daviddup78
im lost, i just bought a 2012 Hemi, and no clue what a can is used for
Developed to eliminate oil from entering your intake by engine blow-by, which channels oil and trash into your direct air stream from the valve train. This is a common problem on both brand new performance and especially older engines, which just suffer more from blow by due to wear and tear.
The most common problem is making your car emit light blueish white smoke upon start up or even during normal driving. The throttle body handles your main air stream and has a breather tube running from the crankcase to the throttle body. The vacuum from the incoming airstream and positive pressure in the crankcase combine to get oil in the air tract.
Every car and vehicle is set up this way to help eliminate the pressure build-up in the bottom end of your engine enabling the piston to move up and down with less resistance.
Catch cans feature a containment system and separator that force all the debris to get captured and contained in the filter while still allowing airflow thus maintaining full function of the breather system.
Another key problem caused by oil in the intake is that it reduces the octane of your fuel and causes detonation especially in turbo, supercharger and nitrous applications.