V.cover to catch can???

[4g63telantra]

On a few car with a fully built motor, I see on the left side of v.cover (in front of cam sensor) and where the pcv valve goes, some people run about 1/2 lines to a catch can.

Why is that and do they "port" the holes on v.cover to fit the huge lines from it?

here is a picture of a set-up like that.

http://dsmtuners.com/forums/showthread.php?t=246019


Also why do people tap a hole where the ex.cam goes as well?

 

[dreamnevo]

I think they do it to relieve pressure, but I could be wrong

 

[timloomis]

Running the breather and pcv to a catch can keeps oil out of the intake. It also eliminates a possible boost leak from the pcv valve if it ever sticks open. You have to run a line from the catch can back into the intake before the turbo though, it still has to have vaccuum.