Who's running a catch can?

Originally Posted by synolimit

FYI that's impossible. The PCV goes to the crank case. The inlet tubes suck air out of the valve cover. The manifold and the inlet tubes are always always in vacuum unless at wot when the mani is at zero or in boost when its +psi. Air can't get sucked into the inlet tube from the outside and then get pushed into the crank case as the crank case and valve covers are always having pressure built up. All those hoses are out's, not in's. that's why the valve covers and cranks vents are hooked up to two different vacuum sources. They are always pulling pressurized air out if the block and valve covers. Only at WOT does the crank case vents get blocked off when the PCV gets pushed closed. But the valve cover vents are always getting air sucked out no matter If you're at idle, wot NA or TT.