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I picked up a turbo miata in "project mode" - and almost got it back together except for the this mystery in the picture. Do you simply get a piece of hose to cross over the two sides of the intercooler tubing?
Looking for some insight into what to do here. (see pics) :
left intercooler tubing from throttle body tubing from turbo to filter
Second photo barb is for for venting the crank-case air cleanly.
ie. Hotside crank case barb -> Oil Catch Can -> AIr Intake Barb
Adding to this, the use of this port for a crank vent has some potential drawbacks. Unless your oil vapor separator tank is 100% efficient, oil vapor will condense inside the intercooler and gradually coat its innards. Oil is a relatively good insulator (as compared to aluminum), so this will decrease the efficiency of the intercooler.
Intercooled engines fare better when the crankcase ventilation system is left open to the atmosphere, through a filter / separator.