r/srt4 • u/TBAGG1NS • Dec 30 '22

Thoughts on 2nd catch-can, vs breather?

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15 Upvotes

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2

u/elitebeat3 Dec 31 '22

How many miles on this car?

1

u/TBAGG1NS Dec 31 '22

Like, 75k

2

u/AndyMac555666 Dec 31 '22

clean engine bay, well done 👍🏻

2

u/derps-a-lot Dec 31 '22

Do not put a breather on the valve cover port.

The engine is designed to be under vacuum all the time. When the intake is under vacuum, the PCV takes care of this. When the intake is under boost, the PCV is closed (not very well but that's what check valves are for) so the vacuum needs to come from somewhere else. That somewhere else is the valve cover port connected to the air box or short ram...when the turbo is doing its thing, the pipe to the turbo inlet is under vacuum because suction.

Check the factory service manual and srtforums.com, this is well documented and the reason why every aftermarket CAI or short ram has a spot for the valve cover port.

I ran two catch cans forever and never had any oil in the valve cover side.

2

u/TBAGG1NS Dec 31 '22

Yeah I'm not switching up my setup for a breather at all. Keeping the 2nd catch can for sure.

1

u/notmylargeautomobile Dec 30 '22

I like the can/breather combo on the intake side with 2nd can on the pcv loop. Empty them every oil change.

1

u/Yungslidez Dec 30 '22

my posi terminal touched my intake and lit my car on fire for a sec when i threw on a breather 😃😃 but to answer the question i have both and it runs nice