KA Pressure in head, heavy smoke from exhaust - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mewantkouki · 02-18-2018, 02:59 PM

Pretty sure the large fitting on the valve cover is designed to suck fresh air into the crank case and the pcv valve & tree that runs to the intake manifold (stock) is designed to pull negative pressure and oily crap through the breather / separator box and be burnt out through the engine. So under boost I would run that line to a catch can under vacuum. (block) and have the valve cover breather connected to a separate catch can (atmospherically vented) with no vacuum source on it.

02-18-2018, 02:59 PM	#11
mewantkouki Zilvia FREAK! Join Date: Nov 2007 Location: Orlando, Fl Age: 38 Posts: 1,250 Trader Rating: (36) Feedback Score: 36 reviews	Pretty sure the large fitting on the valve cover is designed to suck fresh air into the crank case and the pcv valve & tree that runs to the intake manifold (stock) is designed to pull negative pressure and oily crap through the breather / separator box and be burnt out through the engine. So under boost I would run that line to a catch can under vacuum. (block) and have the valve cover breather connected to a separate catch can (atmospherically vented) with no vacuum source on it.