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Thread: How to Remove the Factory AOS / PCV system

  1. #1
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    How to Remove the Factory AOS / PCV system

    I've been trying to figure out how the factory AOS works, to potentially do a delete it or reorient it, but there's not much good info on the web that I can find. My goal is to find everything I can on how to do this, and make a parts list.

    Here's a quick diagram:

    aos.jpg

    Notes: (updated from info received elsewhere)

    * A is the line that allows oil vapors into the baffle assembly while under boost.

    * B is the oil drain back. That's where the separator sends the oil retrieved from the baffled housing.

    * C is the fresh air intake. This is where additional air is allowed into the crankcase to prevent excessive vacuum/pressure in the crankcase. It also is where the oil vapors escape to if the baffle assembly cannot keep up with it's job under boost conditions.

    * D is the PCV valve, this is the line that collects oil and vapors when the motor is not producing boost. This is the line that brings the majority of the oil vapors into the baffle assembly. Under boost, it closes off to prevent the pressurization of the baffle and prevents a boost leak.
    Last edited by smoseley; 10-30-2020 at 11:42 PM.

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    A little research, and help from the Abarth FB group, and I found this: https://tbfperformance.com/it/parti-...decanter-.html

    It's about $150 USD all in, shipped from Italy to the US. They also have the kit available minus the catch can. Will post back on this thread once I've got it in hand and ready to install.
    abarth-mair-kit-modifica-decanter.jpg

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    lammie200's Avatar
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    https://www.addw1.com/

    I use the v3 version from this manufacturer. It has only been effective spliced into D back to the throttle body and catches a fair amount of oil. I drilled out the PCV valve and placed a one way check valve between the can and the throttle body. Works great. I never caught anything with a second can spliced between C and the side of the air box.
    2017 Abarth Grigio Cenere SR | OEM 17s | EC V3 & Sprint Panel Filter | E+D Tune P1 | TMC Autoflash | 4C CPs | MPx Exhaust | RRM Turbo Blanket | PCV Catch Can | 5mm/12mm Spacers | Neu-F Rear Bar | DNA Lower & Side Braces | 4 Konis | 4 Springs | MPx MC Bracket | 2" Steering Wheel Spacer

    2013 Sport Argento SR - SOLD - | Many Mods

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    Senior Member aelfwyne's Avatar
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    Can I ask, other than having to manually empty a catch can, what the purpose of deleting the AOS would be?
    2015 Rosso Abarth - MAD FIAT - 5 Speed - Phase 2
    2015 Granito Lucente 500T - Proyecto Estupido (Salvage) - Auto - OFT Stage 1

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    First, you aren't actually deleting the AOS. It will still trap some blow-by oil vapor, condense it, and allow it to drip back down into the valve cover. Second, a catch can will keep the blow-by oil vapor that isn't affected by the AOS from being returned to the throttle body and intake manifold. Mixing blow-by oil vapor into the throttle body and intake intake will decrease fuel octane and increase the coating of parts in oil sludge including valves and sensors. Some people don't think that oil catch cans are necessary unless you have direct injection engines which we do not have. However, a catch can on our cars is a very simple mod and they do catch oil which I prefer not to burn. Disposal is the same as any used motor oil. In some respects you are polluting less if the oil is disposed of properly.
    Last edited by lammie200; 10-31-2020 at 10:46 PM.
    2017 Abarth Grigio Cenere SR | OEM 17s | EC V3 & Sprint Panel Filter | E+D Tune P1 | TMC Autoflash | 4C CPs | MPx Exhaust | RRM Turbo Blanket | PCV Catch Can | 5mm/12mm Spacers | Neu-F Rear Bar | DNA Lower & Side Braces | 4 Konis | 4 Springs | MPx MC Bracket | 2" Steering Wheel Spacer

    2013 Sport Argento SR - SOLD - | Many Mods

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