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[patsmx5]

the angle points down stream


                     \  \
----------------------\  \--------------

---------------------> exhaust flow

-----------------------------------------

             \    \
              \    \
...............\    \..................
                \    \
                 \
                  \___\

------------------>




...........................................

[onlyflash944]

yes, you want the cut to extend into the exhaust flow, not end even with the exhaust pipe, i tried to show that but it is keyboard paint so deal with it

[Joseph Davis]

Wont a slashcut fail track inspections if the can fills up and it spits oil out the exhaust?

If your engine is in semi-decent shape you wont fill the catch can in the amount of time it would take to get the car thru inspection...

Cool so just drain it after each run for good measure. Im going to talk with my exhaust guy and give this a go. I guess if I hate it I can just hack it off and seal up the hole.

NO.  You guys are missing the point of how a catchcan should be set up.

The catchcan should ALWAYS be drained back into the block, nothing manual, something it does by design - look at the Endyn breather install instructions.  If that setup fills up with oil you have some very real problems, and would be spitting more than oil on the track with or without a slashcut.

[Conceptz-X]

Basic Diagram of a Self-Maintaining catch can

[Joseph Davis]

If the line goes below the oil level, and you have blowby issues, oil will go everywhere.

[ifly87]

I used to mess around with that pre turbo intake and all those check valves and bullshit, engines always smoked, even after fresh rebuilds. Now I think the best way to do it is open up those holes in the back, open up another 2 in the v/c and run them to a vented catchcan wich is higher than the 2 on the back of the block so oil can run back in there if it has to.

[Conceptz-X]

If the line goes below the oil level, and you have blowby issues, oil will go everywhere.

Yes, I should have labeled it as drain to crankcase.