Connecting High and Low Side PCV to one catch can?

RandyManSavage · 12-20-2022, 04:33 PM

Can I connect both high and low side as a input in to a OCC and have a output to the throttle body? I found a 3port OCC and have a BMS low side external pcv kit.

From reading, both high and low side just pulls from the Cyclone Oil Separators.

I plan to plug head ports too.

BSM n54iS · 12-20-2022, 05:37 PM

Suppose you physically can but not recommended. The low side catch can which you have pictured has a 50 micron bronze (very fine) filter for low side pressure whereas high side occ like BMS's has a much more coarse filter for higher pressure

RandyManSavage · 12-20-2022, 11:28 PM

I haven’t purchased the OCC yet, but the bronze filter you see in the pic would be the output port, back to the throttle body.

Plan setup:

High Side (3/8 hose) & Low Side ( vacuum tube) —-> Oil catch can —> Output to throttle body.

I don’t know if this would put too much vacuum on the crank case tho

12-20-2022, 04:33 PM	#1
RandyManSavage Registered 0 Rep 3 Posts Drives: BMW Join Date: Dec 2022 Location: AZ iTrader: (0)	Connecting High and Low Side PCV to one catch can? Can I connect both high and low side as a input in to a OCC and have a output to the throttle body? I found a 3port OCC and have a BMS low side external pcv kit. From reading, both high and low side just pulls from the Cyclone Oil Separators. I plan to plug head ports too. Attached Images
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12-20-2022, 05:37 PM	#2
BSM n54iS Brigadier General 2683 Rep 4,203 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	Suppose you physically can but not recommended. The low side catch can which you have pictured has a 50 micron bronze (very fine) filter for low side pressure whereas high side occ like BMS's has a much more coarse filter for higher pressure __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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12-20-2022, 11:28 PM	#3
RandyManSavage Registered 0 Rep 3 Posts Drives: BMW Join Date: Dec 2022 Location: AZ iTrader: (0)	I haven’t purchased the OCC yet, but the bronze filter you see in the pic would be the output port, back to the throttle body. Plan setup: High Side (3/8 hose) & Low Side ( vacuum tube) —-> Oil catch can —> Output to throttle body. I don’t know if this would put too much vacuum on the crank case tho
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